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2.2.0.7 true Derivative Instruments (Details) (USD $) 009020 - Disclosure - Derivative Instruments (Details) true false 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 Schedule Of Net Derivative Instruments In Statement Of Financial Position Fair Value [Abstract] 2 nee_ScheduleOfNetDerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract nee false 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 Current derivative assets 2 nee_CurrentAssetsDerviatives nee false na instant Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted... false false false false false false false false false false false verboselabel false 1 true true false false 470000000 470000000 [1] false false false 2 false false false false 0 0 false false false 3 true true false false 470000000 470000000 [1] false false false 4 false false false false 0 0 false false false 5 true true false false 357000000 357000000 [1] false false false xbrli:monetaryItemType monetary Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements and net of obligations to return margin cash collateral in accordance with FASB Staff Position (FSP) FIN 39-1, "Amendment of FASB Interpretation No. 39." No authoritative reference available. false 4 Noncurrent other assets 2 nee_NetNonCurrentDerivativeAssetFairValue nee false debit instant Fair value of non-current derivative assets, presented on a net basis after terms of master netting arrangements and margin... false false false false false false false false false false false terselabel false 1 false true false false 476000000 476000000 [2] false false false 2 false false false false 0 0 false false false 3 false true false false 476000000 476000000 [2] false false false 4 false false false false 0 0 false false false 5 false true false false 329000000 329000000 [2] false false false xbrli:monetaryItemType monetary Fair value of non-current derivative assets, presented on a net basis after terms of master netting arrangements and margin cash collateral has been applied. No authoritative reference available. false 5 Current derivative liabilities 2 us-gaap_DerivativeLiabilitiesCurrent us-gaap true credit instant No definition available. false false false false false false false false false false true negated false 1 false true false false -516000000 -516000000 false false false 2 false false false false 0 0 false false false 3 false true false false -516000000 -516000000 false false false 4 false false false false 0 0 false false false 5 false true false false -221000000 -221000000 false false false xbrli:monetaryItemType monetary Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 3 -Section A -Paragraph 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 false 6 Noncurrent derivative liabilities 2 nee_OtherLiabilitiesDerivatives nee false na instant Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being... false false false false false false false false false false true negated false 1 false true false false -320000000 -320000000 false false false 2 false false false false 0 0 false false false 3 false true false false -320000000 -320000000 false false false 4 false false false false 0 0 false false false 5 false true false false -170000000 -170000000 false false false xbrli:monetaryItemType monetary Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements and net of rights to reclaim margin cash collateral in accordance with FASB Staff Position (FSP) FIN 39-1, "Amendment of FASB Interpretation No. 39." No authoritative reference available. false 7 Total mark-to-market derivative instrument assets (liabilities) 2 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet us-gaap true debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 110000000 110000000 false false false 2 false false false false 0 0 false false false 3 false true false false 110000000 110000000 false false false 4 false false false false 0 0 false false false 5 false true false false 295000000 295000000 false false false xbrli:monetaryItemType monetary Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 true 8 Margin cash collateral received from counterparties - netted against current derivative assets 2 nee_MarginCashCollateralNettedAgainstNetCurrentDerivativeAssets nee false credit instant The amount of margin cash collateral received from counterparties that was netted against current derivative assets. false false false false false false false false false false false terselabel false 1 false true false false 14000000 14000000 false false false 2 false false false false 0 0 false false false 3 false true false false 14000000 14000000 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4000000 false false false xbrli:monetaryItemType monetary The amount of margin cash collateral received from counterparties that was netted against current derivative assets. No authoritative reference available. false 9 Margin cash collateral received from counterparties - netted against noncurrent derivative assets 2 nee_MarginCashCollateralNettedAgainstNetNonCurrentDerivativeAssets nee false credit instant The amount of margin cash collateral received from counterparties that was netted against noncurrent derivative assets. false false false false false false 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 true false false 1000000 1000000 false false false xbrli:monetaryItemType monetary The amount of margin cash collateral received from counterparties that was netted against noncurrent derivative assets. No authoritative reference available. false 10 Margin cash collateral provided to counterparties - netted against current derivative liabilities 2 nee_MarginCashCollateralNettedAgainstNetCurrentDerivativeLiabilities nee false debit instant The amount of margin cash collateral provided to counterparties that was netted against current derivative liabilities. false false false false false false false false false false false terselabel false 1 false true false false 74000000 74000000 false false false 2 false false false false 0 0 false false false 3 false true false false 74000000 74000000 false false false 4 false false false false 0 0 false false false 5 false true false false 75000000 75000000 false false false xbrli:monetaryItemType monetary The amount of margin cash collateral provided to counterparties that was netted against current derivative liabilities. No authoritative reference available. false 11 Margin cash collateral provided to counterparties - netted against Noncurrent derivative liabilities 2 nee_MarginCashCollateralNettedAgainstNetNonCurrentDerivativeLiabilities nee false debit instant The amount of margin cash collateral provided to counterparties that was netted against Noncurrent derivative liabilities. false false false false false false false false false false false terselabel false 1 false true false false 44000000 44000000 false false false 2 false false false false 0 0 false false false 3 false true false false 44000000 44000000 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 The amount of margin cash collateral provided to counterparties that was netted against Noncurrent derivative liabilities. No authoritative reference available. false 12 Margin cash collateral received from counterparties that was not offset against derivative assets 2 nee_MarginCashCollateralNotNettedAgainstDerivativeAssets nee false credit instant Margin cash collateral received from counterparties not offset against derivative assets. false false false false false false false false false false false terselabel false 1 false true false false 13000000 13000000 false false false 2 false false false false 0 0 false false false 3 false true false false 13000000 13000000 false false false 4 false false false false 0 0 false false false 5 false true false false 18000000 18000000 false false false xbrli:monetaryItemType monetary Margin cash collateral received from counterparties not offset against derivative assets. No authoritative reference available. false 13 Margin cash collateral provided to counterparties that was not offset against derivative liabilities 2 nee_MarginCashCollateralNotNettedAgainstDerivativeLiabilities nee false debit instant Margin cash collateral received from counterparties not offset against derivative liabilities. false false false false false false false false false false false terselabel false 1 false true false false 66000000 66000000 false false false 2 false false false false 0 0 false false false 3 false true false false 66000000 66000000 false false false 4 false false false false 0 0 false false false 5 false true false false 95000000 95000000 false false false xbrli:monetaryItemType monetary Margin cash collateral received from counterparties not offset against derivative liabilities. No authoritative reference available. false 14 Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value [Abstract] 2 nee_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueAbstract nee false 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 15 Fair Values of Derivative Assets Designated as Hedging Instruments 2 us-gaap_DerivativeAssetDesignatedAsHedgingInstrumentFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 36000000 36000000 false false false 2 false false false false 0 0 false false false 3 false true false false 36000000 36000000 false false false 4 false false false false 0 0 false false false 5 false true false false 217000000 217000000 false false false xbrli:monetaryItemType monetary Fair value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 false 16 Fair Values of Derivative Liabilities Designated as Hedging Instruments 2 us-gaap_DerivativeLiabilityDesignatedAsHedgingInstrumentFairValue us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 120000000 120000000 false false false 2 false false false false 0 0 false false false 3 false true false false 120000000 120000000 false false false 4 false false false false 0 0 false false false 5 false true false false 98000000 98000000 false false false xbrli:monetaryItemType monetary Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 false 17 Schedule Of Cash Flow Derivative Instruments Gain Loss In Statement Of Financial Performance [Abstract] 2 nee_ScheduleOfCashFlowDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceAbstract nee false 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 18 Gains (losses) recognized in OCI 2 us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false -64000000 -64000000 false false false 2 false true false false 58000000 58000000 false false false 3 false true false false -83000000 -83000000 false false false 4 false true false false 205000000 205000000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 false 19 Gains (losses) reclassified from accumulated other comprehensive income (AOCI) to net income 2 us-gaap_CashFlowHedgeGainLossReclassifiedToEarningsNet us-gaap true credit duration No definition available. false false false false false false false false false false false label false 1 false true false false 31000000 31000000 false false false 2 false true false false 55000000 55000000 false false false 3 false true false false 48000000 48000000 false false false 4 false true false false 69000000 69000000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of net gains (losses) on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) false 20 Gains (losses) recognized in income due to hedge ineffectiveness 2 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 0 0 [3] false false false 2 false true false false -1000000 -1000000 [3] false false false 3 false true false false 1000000 1000000 [3] false false false 4 false true false false 9000000 9000000 [3] false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net gain or loss recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) false 22 Schedule Of Derivative Instruments Not Designated As Hedging Instruments In Statement Of Financial Position Fair Value [Abstract] 2 nee_ScheduleOfDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsInStatementOfFinancialPositionFairValueAbstract nee false 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 23 Fair Values of Derivative Assets Not Designated as Hedging Instruments 2 us-gaap_DerivativeAssetNotDesignatedAsHedgingInstrumentFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 4205000000 4205000000 false false false 2 false false false false 0 0 false false false 3 false true false false 4205000000 4205000000 false false false 4 false false false false 0 0 false false false 5 false true false false 2662000000 2662000000 false false false xbrli:monetaryItemType monetary Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 false 24 Fair Values of Derivative Liabilities Not Designated as Hedging Instruments 2 us-gaap_DerivativeLiabilityNotDesignatedAsHedgingInstrumentFairValue us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 4115000000 4115000000 false false false 2 false false false false 0 0 false false false 3 false true false false 4115000000 4115000000 false false false 4 false false false false 0 0 false false false 5 false true false false 2556000000 2556000000 false false false xbrli:monetaryItemType monetary Fair value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 false 25 Schedule Of Derivative Instruments Not Designated As Hedging Instruments Gain Loss In Statement Of Financial Performance [Abstract] 2 nee_ScheduleOfDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossInStatementOfFinancialPerformanceAbstract nee false 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 26 Gain (losses) related to derivatives not designated as hedging instruments 2 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 25000000 25000000 false false false 2 false true false false 25000000 25000000 false false false 3 false true false false 360000000 360000000 false false false 4 false true false false 151000000 151000000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net gain (loss) included in earnings for the period from the net change in fair value of derivative instrument not designated as hedging instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1)(b) false 27 Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment 2 nee_GainLossesOnCommodityContractsNotDesignatedAsHedgesRecordedAsRegulatoryAssetsLiabilities nee false credit duration Pursuant to regulatory accounting treatment, net gain (loss) included in regulatory asstes and or liabilities for the period... false false false false false false false false false false false terselabel false 1 false true false false 63000000 63000000 [4] false false false 2 false true false false -21000000 -21000000 false false false 3 false true false false -392000000 -392000000 false false false 4 false true false false -546000000 -546000000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Pursuant to regulatory accounting treatment, net gain (loss) included in regulatory asstes and or liabilities for the period from the net change in fair value of derivative instrument not designated as hedging instrument. No authoritative reference available. false 28 Schedule Of Net Notional Volume Of Commodity Derivative Instruments [Line Items] 2 nee_ScheduleOfNetNotionalVolumeOfCommodityDerivativeInstrumentsLineItems nee false 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 30 Number of interest rate swaps 2 us-gaap_NumberOfInterestRateDerivativesHeld us-gaap true na instant No definition available. false false false false false false false false false false false false 1 false true false false 17 17 false false false 2 false false false false 0 0 false false false 3 false true false false 17 17 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:integerItemType integer Number of interest rate derivative instruments held by the entity at the reporting date. No authoritative reference available. false 31 Net notional amount of interest rate swaps 2 us-gaap_NotionalAmountOfInterestRateCashFlowHedgeDerivatives us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 2700000000 2700000000 false false false 2 false false false false 0 0 false false false 3 false true false false 2700000000 2700000000 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 Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. No authoritative reference available. false 32 Number of foreign currency swaps 2 us-gaap_NumberOfForeignCurrencyDerivativesHeld us-gaap true na instant No definition available. false false false false false false false false false false false false 1 false true false false 2 2 false false false 2 false false false false 0 0 false false false 3 false true false false 2 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:integerItemType integer Number of foreign currency exchange rate derivatives held by the entity at the reporting date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 false 33 Net notional amount of foreign currency swaps 2 us-gaap_NotionalAmountOfForeignCurrencyCashFlowHedgeDerivatives us-gaap true debit instant No definition available. false false false false false false false false false false false false 1 false true false false 290000000 290000000 false false false 2 false false false false 0 0 false false false 3 false true false false 290000000 290000000 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 Aggregate notional amount of all foreign currency derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. No authoritative reference available. false 34 Fair Value of derivative instruments with credit-risk-related contingent features that were in a liability position 2 us-gaap_DerivativeNetLiabilityPositionAggregateFairValue us-gaap true credit instant No definition available. false false false false false false false false false false false false 1 false true false false 1600000000 1600000000 false false false 2 false false false false 0 0 false false false 3 false true false false 1600000000 1600000000 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 The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain or loss on that instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44D -Subparagraph b false 35 Total required posted collateral should FPL Group Capital or FPL's credit ratings fall to BBB 2 nee_AdditionalCollateralAggregateFairValueDueToCreditRatingDowngradeToBbb nee false na instant The aggregate fair value of collateral that would be required to be posted for derivative instruments with... false false false false false false false false false false false terselabel false 1 false true false false 450000000 450000000 false false false 2 false false false false 0 0 false false false 3 false true false false 450000000 450000000 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 The aggregate fair value of collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if the applicable corporate credit ratings were downgraded to BBB at the end of the reporting period. No authoritative reference available. false 36 Total required posted collateral should FPL Group Capital or FPL's credit ratings fall to below investment grade 2 nee_AdditionalCollateralAggregateFairValueDueToCreditRatingDowngradeToBelowInvestmentGrade nee false na instant The aggregate fair value of collateral that would be required to be posted for derivative instruments with... false false false false false false false false false false false terselabel false 1 false true false false 2200000000 2200000000 false false false 2 false false false false 0 0 false false false 3 false true false false 2200000000 2200000000 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 The aggregate fair value of collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if the applicable corporate credit ratings were downgraded to below investment grade at the end of the reporting period. No authoritative reference available. false 37 Additional collateral requirements if non-ratings based contract provisions are triggered 2 nee_AdditionalCollateralAggregateFairValueDueToOtherFinancialMeasures nee false na instant The aggregate fair value of additional collateral that would be required to be posted for derivative instruments with... false false false false false false false false false false false terselabel false 1 false true false false 500000000 500000000 false false false 2 false false false false 0 0 false false false 3 false true false false 500000000 500000000 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 The aggregate fair value of additional collateral that would be required to be posted for derivative instruments with credit-risk-related contingent features if certain cross-default provisions or certain financial measurement requirements were triggered at the end of the reporting period. No authoritative reference available. false 38 Letters of credit posted through the normal course of business that could be applied toward the collateral requirements related to derivative instruments with credit-risk-related contingent features 2 nee_LettersOfCreditAlreadyPostedAggregateFairValue nee false debit instant Letters of Credit that are already posted in the normal course of business, at the end of the reporting period, that could be... false false false false false false false false false false false terselabel false 1 false true false false 175000000 175000000 false false false 2 false false false false 0 0 false false false 3 false true false false 175000000 175000000 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 Letters of Credit that are already posted in the normal course of business, at the end of the reporting period, that could be applied toward the collateral requirements for derivative instruments with credit-risk-related contingent features. No authoritative reference available. false 39 Maximum length of time hedged in commodity cash flow hedges 2 nee_MaximumLengthOfTimeHedgedInCommodityCashFlowHedge nee false na duration Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted... false false false false false false 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 December 2012 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false us-types:dateStringItemType normalizedstring Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted commodity transactions No authoritative reference available. false 40 Maximum length of time hedged in interest rate cash flow hedges 2 us-gaap_MaximumLengthOfTimeHedgedInInterestRateCashFlowHedge us-gaap true na duration 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 January 2027 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false us-types:durationStringItemType normalizedstring Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) false 1 At June 30, 2010 and December 31, 2009, NextEra Energy's balances reflect the netting of $14 million and $4 million, respectively, in margin cash collateral received from counterparties. 2 At December 31, 2009, NextEra Energy's balances reflect the netting of $1 million in margin cash collateral received from counterparties. 3 Represents the ineffective portion of the hedging instrument. 4 In addition, for the three and six months ended June 30, 2010, FPL recorded approximately $63 million of gains and $392 million of losses, respectively, related to commodity contracts as regulatory liabilities and regulatory assets, respectively, on its condensed consolidated balance sheets. For the three and six months ended June 30, 2009, FPL recorded losses of approximately $21 million and $546 million, respectively, related to commodity contracts as regulatory assets on its condensed consolidated balance sheets. 5 One million British thermal units 6 $1 million loss is included in interest expense and the balance is included in other - net. 5 131 false NoRounding UnKnown UnKnown true true