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2.2.0.7 true Fair Value Measurements (Detail) (USD $) 009030 - Disclosure - Fair Value Measurements (Detail) true false In Millions false false 1 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 3 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u003 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 5 USD false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 2 Assets: 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Cash equivalents: equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisCashEquivalentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents... false false false false false false false false false false false terselabel false 1 true true false false 361000000 361 false false false 2 false false false false 0 0 false false false 3 true true false false 361000000 361 false false false 4 false false false false 0 0 false false false 5 true true false false 79000000 79 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 4 Special Use Funds: 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 5 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsEquitySecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 1519000000 1519 false false false 2 false false false false 0 0 false false false 3 false true false false 1519000000 1519 false false false 4 false false false false 0 0 false false false 5 false true false false 1705000000 1705 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 6 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 704000000 704 false false false 2 false false false false 0 0 false false false 3 false true false false 704000000 704 false false false 4 false false false false 0 0 false false false 5 false true false false 574000000 574 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 7 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsCorporateDebtSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 430000000 430 false false false 2 false false false false 0 0 false false false 3 false true false false 430000000 430 false false false 4 false false false false 0 0 false false false 5 false true false false 452000000 452 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 8 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsMortgageBackedSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 560000000 560 false false false 2 false false false false 0 0 false false false 3 false true false false 560000000 560 false false false 4 false false false false 0 0 false false false 5 false true false false 618000000 618 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 9 Other debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsOtherDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 96000000 96 false false false 2 false false false false 0 0 false false false 3 false true false false 96000000 96 false false false 4 false false false false 0 0 false false false 5 false true false false 41000000 41 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 10 Other Investments: 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 11 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false true false false 5000000 5 false false false 4 false false false false 0 0 false false false 5 false true false false 7000000 7 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 12 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 20000000 20 false false false 2 false false false false 0 0 false false false 3 false true false false 20000000 20 false false false 4 false false false false 0 0 false false false 5 false true false false 38000000 38 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 13 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsCorporateDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 32000000 32 false false false 2 false false false false 0 0 false false false 3 false true false false 32000000 32 false false false 4 false false false false 0 0 false false false 5 false true false false 35000000 35 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 14 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsMortgageBackedSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 48000000 48 false false false 2 false false false false 0 0 false false false 3 false true false false 48000000 48 false false false 4 false false false false 0 0 false false false 5 false true false false 31000000 31 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 15 Other 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsOther nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 17000000 17 false false false 2 false false false false 0 0 false false false 3 false true false false 17000000 17 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 16 Derivatives: 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 17 Commodity contracts 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeCommodityContractsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 909000000 909 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 909000000 909 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 18 Interest rate swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeInterestRateSwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 23000000 23 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 23000000 23 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 19 Foreign currency swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 14000000 14 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 14000000 14 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 20 Derivative Assets 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 686000000 686 [1] false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 21 Derivatives: 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 22 Commodity contracts 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeCommodityContractsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 715000000 715 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 715000000 715 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 23 Interest rate swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeInterestRateSwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 117000000 117 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 117000000 117 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 24 Foreign currency swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 4000000 4 [1] false false false 2 false false false false 0 0 false false false 3 false true false false 4000000 4 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 25 Derivative Liabilities 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 391000000 391 [1] false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 26 Fair value of investments in commingled funds whose underlying investments would be Level 1 if those investments were held directly by the registrant 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsInvestedInCommingledFunds nee false debit instant Fair value of investmetns in commingled funds whose underlying investments would be Level 1 if those investments were held... false false false false false false false false false false false terselabel false 1 false true false false 869000000 869 false false false 2 false false false false 0 0 false false false 3 false true false false 869000000 869 false false false 4 false false false false 0 0 false false false 5 false true false false 918000000 918 false false false xbrli:monetaryItemType monetary Fair value of investmetns in commingled funds whose underlying investments would be Level 1 if those investments were held directly by the registrant No authoritative reference available. false 27 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 35 Realized and unrealized gains (losses) reflected in operating revenues 2 nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInOperatingRevenues nee false credit duration This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the... false false false false false false false false false false false terselabel false 1 false true false false -109000000 -109 false false false 2 false true false false 47000000 47 false false false 3 false true false false 343000000 343 false false false 4 false true false false 385000000 385 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in operating revenues; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). No authoritative reference available. false 36 Realized and unrealized gains (losses) reflected in fuel purchased power and interchange 2 nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInFuelPurchasedPowerAndInterchange nee false debit duration This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the... false false false false false false false false false false false terselabel false 1 false true false false -1000000 -1 false false false 2 false false false false 0 0 false false false 3 false true false false 7000000 7 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in fuel, purchased power and interchange; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). No authoritative reference available. false 37 Gross transfers into Level 3 were a result of decreased observability of market data 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGrossTransfersIn nee false debit duration This element represents gross transfers into net assets (liabilities) measured at fair value on a recurring basis using... false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false true false false 2000000 2 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents gross transfers into net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. No authoritative reference available. false 38 Gross transfers out of Level 3 to Level 2 were a result of increased observability of market data 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGrossTransfersOut nee false credit duration This element represents gross transfers out of net assets (liabilities) measured at fair value on a recurring basis using... false false false false false false false false false false false terselabel false 1 false true false false 23000000 23 false false false 2 false false false false 0 0 false false false 3 false true false false 30000000 30 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents gross transfers out of net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. No authoritative reference available. false 39 Unrealized gains (losses) reflected in operating revenues 2 nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOperatingRevenues nee false na duration This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included... false false false false false false false false false false false terselabel false 1 false true false false -98000000 -98 false false false 2 false true false false 49000000 49 false false false 3 false true false false 233000000 233 false false false 4 false true false false 321000000 321 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in Operating Revenues. Such unrealized (holding) gains or losses relate to those assets (liabilities) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). No authoritative reference available. false 40 Unrealized gains (losses) are reflected in fuel purchased power and interchange 2 nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInFuelPurchasedPowerAndInterchange nee false credit duration This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included... false false false false false false false false false false false terselabel false 1 false true false false -1000000 -1 false false false 2 false false false false 0 0 false false false 3 false true false false 4000000 4 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in fuel, purchased power and interchange. Such unrealized (holding) gains or losses relate to those assets (liabilities) still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). No authoritative reference available. false 41 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] 0 na true na na No definition available. false true false false false false false false false false false http://nexteraenergyresources.com/role/fairvaluemeasurementsdetail false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 6 USD true false false false Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 42 Assets: 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 43 Cash equivalents: equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisCashEquivalentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 44 Special Use Funds: 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 45 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsEquitySecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 573000000 573 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 657000000 657 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 46 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 602000000 602 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 275000000 275 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 47 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsCorporateDebtSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 48 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsMortgageBackedSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 49 Other debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsOtherDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 50 Other Investments: 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 51 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 52 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 20000000 20 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 53 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsCorporateDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 54 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsMortgageBackedSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 55 Other 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsOther nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 56 Derivatives: 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 57 Commodity contracts 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeCommodityContractsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 1751000000 1751 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 58 Interest rate swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeInterestRateSwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 59 Foreign currency swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 60 Derivative Assets 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 988000000 988 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 61 Derivatives: 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 62 Commodity contracts 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeCommodityContractsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 1838000000 1838 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 63 Interest rate swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeInterestRateSwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 64 Foreign currency swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 65 Derivative Liabilities 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1110000000 1110 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 81 Significant Other Observable Inputs (Level 2) [Member] 0 na true na na No definition available. false true false false false false false false false false false http://nexteraenergyresources.com/role/fairvaluemeasurementsdetail false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 8 USD true false false false Significant Other Observable Inputs (Level 2) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel2Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false Significant Other Observable Inputs (Level 2) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel2Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 82 Assets: 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 83 Cash equivalents: equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisCashEquivalentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents... false false false false false false false false false false false terselabel false 1 false true false false 361000000 361 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 79000000 79 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 84 Special Use Funds: 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 85 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsEquitySecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 946000000 946 [2] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1048000000 1048 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 86 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 102000000 102 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 299000000 299 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 87 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsCorporateDebtSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 430000000 430 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 452000000 452 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 88 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsMortgageBackedSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 560000000 560 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 618000000 618 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 89 Other debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsOtherDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 96000000 96 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 41000000 41 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 90 Other Investments: 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 91 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 3000000 3 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 92 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 38000000 38 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 93 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsCorporateDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 32000000 32 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 35000000 35 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 94 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsMortgageBackedSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 48000000 48 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 31000000 31 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 95 Other 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsOther nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 12000000 12 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 96 Derivatives: 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 97 Commodity contracts 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeCommodityContractsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 1461000000 1461 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 98 Interest rate swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeInterestRateSwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 23000000 23 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 99 Foreign currency swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 14000000 14 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 100 Derivative Assets 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1089000000 1089 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 101 Derivatives: 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 102 Commodity contracts 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeCommodityContractsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 1631000000 1631 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 103 Interest rate swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeInterestRateSwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 117000000 117 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 104 Foreign currency swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 4000000 4 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 105 Derivative Liabilities 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1106000000 1106 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 121 Significant Unobservable Inputs (Level 3) [Member] 0 na true na na No definition available. false true false false false false false false false false false http://nexteraenergyresources.com/role/fairvaluemeasurementsdetail false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 10 USD true false false false Significant Unobservable Inputs (Level 3) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Significant Unobservable Inputs (Level 3) [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 122 Assets: 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 123 Cash equivalents: equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisCashEquivalentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 124 Special Use Funds: 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 125 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsEquitySecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 126 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 127 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsCorporateDebtSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 128 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsMortgageBackedSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 129 Other debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsOtherDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 130 Other Investments: 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 131 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 132 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 133 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsCorporateDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 134 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsMortgageBackedSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 135 Other 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsOther nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 136 Derivatives: 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 137 Commodity contracts 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeCommodityContractsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 994000000 994 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 138 Interest rate swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeInterestRateSwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 139 Foreign currency swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 140 Derivative Assets 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 801000000 801 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 141 Derivatives: 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 142 Commodity contracts 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeCommodityContractsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 647000000 647 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 143 Interest rate swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeInterestRateSwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 144 Foreign currency swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 145 Derivative Liabilities 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 437000000 437 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 161 Netting [Member] 0 na true na na No definition available. false true false false false false false false false false false http://nexteraenergyresources.com/role/fairvaluemeasurementsdetail false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 12 USD true false false false Netting [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi nee_NettingMember nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 13 USD true false false false Netting [Member] nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis xbrldi http://xbrl.org/2006/xbrldi nee_NettingMember nee_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 162 Assets: 2 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 163 Cash equivalents: equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisCashEquivalentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "cash and cash equivalents" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 164 Special Use Funds: 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 165 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsEquitySecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 166 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 167 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsCorporateDebtSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 168 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsMortgageBackedSecurities nee false na instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 169 Other debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisSpecialUseFundsOtherDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Special use funds" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Special use funds" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 170 Other Investments: 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 171 Equity securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsEquitySecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 172 U.S. Government and municipal bonds 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsUsGovernmentAndMunicipalBonds nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 173 Corporate debt securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsCorporateDebtSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 174 Mortgage-backed securities 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsMortgageBackedSecurities nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 175 Other 2 nee_FairValueAssetsMeasuredOnRecurringBasisOtherInvestmentsOther nee false debit instant This element represents a certain statement of financial position asset caption "Other investments" which represents a class... false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption "Other investments" which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. No authoritative reference available. false 176 Derivatives: 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 177 Commodity contracts 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeCommodityContractsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false -3297000000 -3297 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 178 Interest rate swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeInterestRateSwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 179 Foreign currency swaps 2 nee_FairValueAssetsMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsAssets nee false debit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative asset No authoritative reference available. false 180 Derivative Assets 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false -2192000000 -2192 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 181 Derivatives: 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeAbstract nee false na duration No definition available. false false false false false true false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 182 Commodity contracts 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeCommodityContractsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false -3401000000 -3401 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 183 Interest rate swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeInterestRateSwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 184 Foreign currency swaps 2 nee_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeForeignCurrencySwapsLiabilities nee false credit instant Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability false false false false false false false false false false false terselabel false 1 false true false false 0 0 [3] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 [1] false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net Fair Value of derivative assets reflected in the balance sheet as either a current or non current derivative liability No authoritative reference available. false 185 Derivative Liabilities 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisDerivativeFinancialInstrumentsLiabilities us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false -2262000000 -2262 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position liability caption which represents a class of liabilities, or which may include an individual liability, measured at fair value on a recurring basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a false 201 Derivative Financial Instruments Net [Member] 0 na true na na No definition available. false true false false false false false false false false false http://nexteraenergyresources.com/role/fairvaluemeasurementsdetail false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 14 USD true false false false Derivative Financial Instruments Net [Member] us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis xbrldi http://xbrl.org/2006/xbrldi nee_DerivativeFinancialInstrumentsNetMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 15 USD true false false false Derivative Financial Instruments Net [Member] us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis xbrldi http://xbrl.org/2006/xbrldi nee_DerivativeFinancialInstrumentsNetMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 16 USD true false false false Derivative Financial Instruments Net [Member] us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis xbrldi http://xbrl.org/2006/xbrldi nee_DerivativeFinancialInstrumentsNetMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 17 USD true false false false Derivative Financial Instruments Net [Member] us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis xbrldi http://xbrl.org/2006/xbrldi nee_DerivativeFinancialInstrumentsNetMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetTypeAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 227 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 228 Fair value of derivatives based on significant unobservable inputs beginning balance 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetValue nee false debit instant This element represents the net asset (liability) fair value using significant unobservable inputs (Level 3) which is... false false false false false false false false true false false periodstartlabel false 1 false true false false 549000000 549 false false false 2 false true false false 539000000 539 false false false 3 false true false false 364000000 364 false false false 4 false true false false 404000000 404 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the net asset (liability) fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. No authoritative reference available. false 229 Included in earnings(a) 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityGainLossIncludedInEarnings nee false debit duration This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair... false false false false false false false false false false false terselabel false 1 false true false false -110000000 -110 [4] false false false 2 false true false false 47000000 47 [4] false false false 3 false true false false 350000000 350 [5] false false false 4 false true false false 385000000 385 [5] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset (liability) value. No authoritative reference available. false 230 Realized and unrealized gains (losses) Included in regulatory assets and liabilities 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInRegulatoryAssetsAndLiabilities nee false debit duration This element represents total gains or losses for the period (realized and unrealized), arising from net assets (liabilities)... false false false false false false false false false false false terselabel false 1 false true false false -1000000 -1 false false false 2 false true false false 0 0 false false false 3 false true false false -1000000 -1 false false false 4 false true false false 5000000 5 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents total gains or losses for the period (realized and unrealized), arising from net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets and liabilities. No authoritative reference available. false 231 Settlements and net option premiums 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilitySettlementsAndNetOptionPremiums nee false debit duration This element represents settlements and net options premiums (net) which have taken place during the period in relation to... false false false false false false false false false false false terselabel false 1 false true false false -69000000 -69 false false false 2 false true false false -116000000 -116 false false false 3 false true false false -338000000 -338 false false false 4 false true false false -246000000 -246 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents settlements and net options premiums (net) which have taken place during the period in relation to net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3). No authoritative reference available. false 232 Net transfers in/out(b) 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetLiabilityTransfersNet nee false na duration This element represents [net] transfers in to and out of net assets (liabilities) measured at fair value on a recurring basis... false false false false false false false false false false false terselabel false 1 false true false false -22000000 -22 false false false 2 false true false false 15000000 15 false false false 3 false true false false -28000000 -28 [6] false false false 4 false true false false -63000000 -63 [6] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents [net] transfers in to and out of net assets (liabilities) measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. No authoritative reference available. false 233 Fair value of net derivatives based on significant unobservable inputs ending balance 2 nee_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetValue nee false debit instant This element represents the net asset (liability) fair value using significant unobservable inputs (Level 3) which is... false false false false false false false false false true false periodendlabel false 1 false true false false 347000000 347 false false false 2 false true false false 485000000 485 false false false 3 false true false false 347000000 347 false false false 4 false true false false 485000000 485 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This element represents the net asset (liability) fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. No authoritative reference available. false 234 The amount of gains for the period included in earnings attributable to the change in unrealized gains (losses) relating to derivatives still held at the reporting date (a) 2 nee_FairValueNetAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome nee false credit duration This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included... false false false false false false false false false false false terselabel false 1 true true false false -99000000 -99 [7] false false false 2 true true false false 49000000 49 [7] false false false 3 true true false false 237000000 237 [8] false false false 4 true true false false 321000000 321 [8] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in other income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). No authoritative reference available. false 1 See Note 2 for a reconciliation of net derivatives to NextEra Energy's condensed consolidated balance sheets. 2 At NextEra Energy, approximately $869 million are invested in commingled funds whose underlying investments would be Level 1 if those investments were held directly by NextEra Energy. 3 Includes the effect of the contractual ability to settle contracts under master netting arrangements and margin cash collateral payments and receipts. 4 For the three months ended June 30, 2010 and 2009, $(109) million and $47 million, respectively, of realized and unrealized gains (losses) are reflected in operating revenues in the condensed consolidated statements of income. For the three months ended June 30, 2010, $(1) million of realized and unrealized gains (losses) are reflected in fuel, purchased power and interchange in the condensed consolidated statements of income. 5 For the six months ended June 30, 2010 and 2009, $343 million and $385 million, respectively, of realized and unrealized gains (losses) are reflected in operating revenues in the condensed consolidated statements of income. For the six months ended June 30, 2010, $7 million of realized and unrealized gains (losses) are reflected in fuel, purchased power and interchange in the condensed consolidated statements of income. 6 For the six months ended June 30, 2010, gross transfers of $2 million into Level 3 were a result of decreased observability of market data, and gross transfers of $30 million from Level 3 to Level 2 were a result of increased observability of market data. NextEra Energy's policy is to recognize all transfers at the beginning of the reporting period. 7 For the three months ended June 30, 2010 and 2009, $(98) million and $49 million, respectively, of unrealized gains (losses) are reflected in operating revenues in the condensed consolidated statements of income. For the three months ended June 30, 2010, $(1) million of unrealized gains (losses) are reflected in fuel, purchased power and interchange in the condensed consolidated statements of income. 8 For the six months ended June 30, 2010 and 2009, $233 million and $321 million, respectively, of unrealized gains (losses) are reflected in operating revenues in the condensed consolidated statements of income. For the six months ended June 30, 2010, $4 million of unrealized gains (losses) are reflected in fuel, purchased power and interchange in the condensed consolidated statements of income. 5 141 false Millions UnKnown UnKnown false true