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2.2.0.25falsefalse003000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWStruefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2010 - 12/31/2010 USD ($) USD ($) / shares $c00323http://www.sec.gov/CIK0000753308duration2010-01-01T00:00:002010-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0u001Standardhttp://www.xb rl.org/2003/instancepurexbrli0u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u004Standardhttp://nexteraenergyresources.com/20101231mWnee0USDUSD$2falsefalseUSDfalsefalse1/1/2009 - 12/31/2009 USD ($) USD ($) / shares $c00022http://www.sec.gov/CIK0000753308duration2009-01-01T00:00:002009-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u003Dividehttp://www.xbrl. org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3falsefalseUSDfalsefalse1/1/2008 - 12/31/2008 USD ($) USD ($) / shares $c00000http://www.sec.gov/CIK0000753308duration2008-01-01T00:00:002008-12-31T00:00:00u000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u003Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli 0u001Standardhttp://www.xbrl.org/2003/instancepurexbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$3true0us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract< ElementPrefix>us-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00false falsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. 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Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b falsefalseEquity in earnings of equity method investees13false0us-gaap_EquityMethodInvestmentDividendsOrDistributionsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1true falsefalse7400000074falsefalsefalsefalsefalse2truefalsefalse6900000069falsefalsefalsefalsefalse3truefalsefalse124000000124falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 falsefalseDistributions of earnings from equity method investees14false0nee_AllowanceForEquityFundsUsedDuringConstructionneefalsenadurationThe allowance for cost of equity funds used during construction, capitalized as part of the cost of plant and equipment for...falsefalsefalsefalsefalsefalsefalsefalsefalsetrue

negated1truefalsefalse-37000000-37falsefalsefalsefalsefalse2truefalsefalse-53000000-53falsefalsefalsefalsefalse3truefalsefalse-35000000-35falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe allowance for cost of equity funds used during construction, capitalized as part of the cost of plant and equipment for the portion financed by equity.No authoritative reference available.falsefalseAllowance for equity funds used during construction15false0us-gaap_GainsLossesOnSalesOfAssetsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefals
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falsefalse-18000000-18falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extent appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense).No authoritative reference available.falsefalseGains on disposal of assets - net16false0nee_OtherThanTemporaryImpairmentLossesOnSecuritiesHeldInNuclearDecomissioningFundsneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated
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efalse3truefalsefalse148000000148falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther than temporary impairment losses on securities held in nuclear decommissioning fund
s17true0us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseChanges in operating assets and liabilities:18false0us-gaap_IncreaseDecreaseInAccountsReceivableus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-73000000-73falsefalsefalsefalsefalse2truefalsefalse1800000018falsefalsefalsefalsefalse3truefalsefalse4900000049falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseCustomer receivables19false0us-gaap_IncreaseDecreaseInOtherReceivablesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalse
false-29000000-29falsefalsefalsefalsefalse2truefalsefalse-13000000-13falsefalsefalsefalsefalse3truefa
lsefalse-26000000-26falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in other amounts due to the reporting entity, which are not otherwise defined in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseOther receivables20false0us-gaap_IncreaseDecreaseInInventoriesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2200000022falsefalsefalsefalsefalse2truefalsefalse8500000085falsefalsefalsefalsefalse3truefalsefalse-106000000-106falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseMaterials, supplies and fossil fuel inventory21false0nee_IncreaseDecreaseInOtherCurrentAssetsneefalsenadurationThe net change during the reporting period in other operating current assets not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-52000000-52falsefalsefalsefalsefalse2truefalsefalse90000009falsefalsefalsefalse<
/hasSegments>false3truefalsefalse-31000000-31falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in other operating current assets not otherwise defined in the taxonomy.No authoritative reference available.falsefalse
Other current assets22false0nee_OtherOperatingAssetsNoncurrentneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse4200000042falsefalsefalsefalsefalse2truefalsefalse-103000000-103falsefalsefalsefalsefalse3truefalsefalse-166000000-166falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther assets23false0us-gaap_IncreaseDecreaseInAccountsPayableus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse179000000179falsefalsefalse<
hasSegments>falsefalse2truefalsefalse-86000000-86falsefalsefalsefalsefalse3truefalsefalse-120000000-120falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseAccounts payable24false0us-gaap_IncreaseDecreaseInCustomerDepositsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse2100000021falsefalsefalsefalsefalse2truefalsefalse3800000038falsefalsefalsefalsefalse3truefalsefalse3700000037falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the period in the amount of customer money held in customer accounts, including security deposits, collateral for a current or future transactions, initial payment of the cost of acquisition or for the right to enter into a contract or agreement.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseCustomer deposits25false0nee_MarginCashCollateralneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefals
e6100000061falsefalsefalsefalsefalse2truefalsefalse-110000000-110falsefalsefalsefalsefalse3truefalsefalse4900000049falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseMargin cash collateral26false0us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayableus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse5600000056falsefalsefalsefalsefalse2truefalsefalse80000008falsefalsefalsefalsefalse3truefalsefalse-17000000-17falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseIncome taxes27false0nee_InterestAndOtherTaxesneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-3000000-3falsefalsefalsefalsefalse2truefalsefalse2200000022falsefalsefalsefalsefalse3truefalsefalse3000000030falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseInterest and other taxes28false0nee_IncreaseDecreaseInOtherCurrentLiabilitiesneefalsenadurationThe net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse7600000076falsefalsefalsefalsefalse2truefalsefalse-45000000-45falsefalsefalsefalsefalse3truefalsefalse189000000189falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy.No authoritative reference available.falsefalseOther current liabilities29false0nee_OtherLiabilitiesNotOtherwiseDefinedneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-63000000-63falsefalsefalsefalsefalse2truefalsefalse-5000000-5falsefalsefalsefalsefalse3truefalsefalse-61000000-61falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther liabilities30false0us-gaap_OtherNoncashExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse3800000038falsefalsefalsefalsefalse2truefalsefalse119000000119falsefalsefalsefalsefalse3truefalsefalse5900000059falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryOther expenses included in net income that result in no cash
 inflows or outflows in the period which are not otherwise defined in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseOther - net31false0us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalse
false38340000003834falsefalsefalsefalsefalse2truefalsefalse44630000004463falsefalsefalsefalsefalse3truefalsefalse34030000003403falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activiti
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truefalseNet cash provided by operating activities32true0us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseNet cash used in investing activities33false0nee_CapitalExpendituresOfPublicUtilityneefalsecreditdurationThe cash outflow for capital expenditures of a public utility for electric utility plant and equipment. Amount includes the...falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-2605000000-2605falsefalsefalsefalsefalse2truefalsefalse-2522000000-2522falsefalsefalsefalsefalse3truefalsefalse-2234000000-2234falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for capital expenditures of a public utility for electric utility plant and equipment. Amount includes the allowance for borrowed funds used in construction and excludes the allowance for equity funds used during construction and excludes expenditures related to nuclear fuel, which has a separate taxonomy.No authoritative reference available.falsefalseCapital expenditures of FPL34false0nee_IndependentPowerInvestmentsneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-2899000000-2899falsefalsefalsefalsefalse2truefalsefalse-3068000000-3068falsefalsefalsefalsefalse3truefalsefalse-2715000000-2715<
CurrencyCode />falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseIndependent power and other investments of NextEra Energy Resources35false0nee_CashGrantsUnderAmericanRecoveryAndReinvestmentActOfneefalsenadurationNo definition
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seMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseCash grants under the American Recovery and Reinvestment Act of 200936false0nee_FundsReceivedFromSpentFuelSettlementAgreementneefalsenadurationNo definition available.falsefalsefalsefalsefalse
falsefalsefalsefalsefalseterselabel1truefalsefalse4400000044falsefalsefalsefalsefalse2truefalsefalse8600000086falsefalsefalsefalsefalse3truefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseFunds received from a spent fuel settlement37false0us-gaap_PaymentsForProceedsFromNuclearFuelus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-274000000-274falsefalsefalsefalsefalse2truefalsefalse-362000000-362falsefalsefalsefalsefalse3truefalsefalse-247000000-247falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from any material that is commonly used in the generation of nuclear energy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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falsefalseNuclear fuel purchases38false0nee_OtherCapitalExpendituresneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-68000000-68falsefalsefalsefalsefalse2truefalsefalse-54000000-54falsefalsefalsefalsefalse3truefalse<
DisplayZeroAsNone>false-40000000-40falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseOther capital expenditures39false0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceedsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse67260000006726fa
lsefalsefalsefalsefalse2truefalsefalse45920000004592falsefalsefalsefalsefalse3truefalsefalse22350000002235falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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 -Number 115
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falsefalseProceeds from sale of securities in special use funds40false0nee_PurchasesOfSecuritiesInSpecialUseFundsneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-6835000000-6835falsefalsefalsefalsefalse2truefalsefalse-4710000000-4710falsefalsefalsefalsefalse3truefalsefalse-2315000000-2315falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalsePurchases of securities in special use funds41false0nee
_ProceedsFromSaleOfOtherSecuritiesneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse721000000721falsefalsefalsefalsefalse2truefalsefalse773000000773falsefalsefalsefalsefalse3truefalsefalse2800000028falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseProceeds from sale of other securities42false0nee_PurchasesOfOtherSecuritiesneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-714000000-714falsefalsefalsefalsefalse2truefalsefalse-782000000-782falsefalsefalsefalsefalse3truefalsefalse-84000000-84falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalsePurchases of other securities43false0us-gaap_PaymentsToAcquireOtherLoansAndLeasesHeldForInvestmentus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse00falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse-500000000-500falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from other loans and leases held-for-investment not otherwise defined in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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 -Name Statement of Financial Accounting Standard (FAS)
 -Number 102
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falsefalseFunding of loan44false0us-gaap_PaymentsForProceedsFromOtherInvestingActivitiesus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalse<
/IsRatio>false3200000032falsefalsefalsefalsefalse2truefalsefalse1200000012falsefalsefalsefalsefalse3truefalsefalse6400000064falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
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 -Number 95
 -Paragraph 15

falsefalseOther - net45false0us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse-5284000000-5284falsefalsefalsefalsefalse2truefalsefalse-5935000000-5935falsefalsefalsefalsefalse3true
falsefalse-5808000000-5808falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from investing activity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 26

truefalseNet cash used in investing activities46true0us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseNet cash provided by financing activities47false0us-gaap_ProceedsFromIssuanceOfLongTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse37240000003724falsefalsefalsefalsefalse2truefalsefalse32200000003220falsefalsefalsefalsefalse3truefalsefalse38270000003827falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 19
 -Subparagraph b

falsefalseIssuances of long-term debt48false0us-gaap_RepaymentsOfLongTermDebtus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-769000000-769falsefalsefalsefalsefalse2truefalsefalse-1635000000-1635falsefalsefalsefalsefalse3truefalsefalse-1358000000-1358falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 20
 -Subparagraph b

falsefalseRetirements of long-term debt49false0nee_SaleOfDifferentialMembershipInterestsneefalsenadurationThe cash inflow from the sale of membership interests.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1tr
uefalsefalse261000000261falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse00falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the sale of membership interests.No authoritative reference available.falsefalseProceeds from sale of differential membership interests50false0
us-gaap_ProceedsFromRepaymentsOfShortTermDebtus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse-1130000000-1130falsefalsefalsefalsefalse2truefalsefalse154000000154falsefalsefalsefalsefalse3truefalsefalse848000000848falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18

falsefalseNet change in short-term debt51false0us-gaap_ProceedsFromIssuanceOfCommonStockus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefal
sefalse308000000308falsefalsefalsefalsefalse2truefalsefalse198000000198falsefalsefalsefalsefalse3truefalsefalse4100000041falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash inflow from the additional capital contribution to the entity.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 19
 -Subparagraph a

falsefalseIssuances of common stock - net52false0us-gaap_PaymentsOfDividendsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsetruenegated1truefalsefalse-823000000-823falsefalsefalsefalsefalse2truefalsefalse-766000000-766falsefalsefalsefalsefalse3truef
alsefalse-714000000-714falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe cash outflow from the entity's earnings to the shareholders.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 20
 -Subparagraph a

falsefalseDividends on common stock53false0us-gaap_ProceedsFromPaymentsForOtherFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse-57000000-57falsefalsefalsefalsefalse2truefalsefalse40000004falsefalsefalsefalsefalse3truefalsefalse60000006falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 18, 19, 20

falsefalseOther - net54false0us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse15140000001514falsefalsefalsefalsefalse2truefalsefalse11750000001175falsefalsefalsefalsefalse3truefalsefalse26500000002650falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net cash inflow (outflow) from financing activity for the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 26

truefalseNet cash provided by financing activities55false0us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse6400000064falsefalsefalsefalsefalse2truefalsefalse-297000000-297falsefalsefalsefalsefalse3truefalsefalse245000000245falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe net change between the beginning and ending balance of cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 26

truefalseNet increase (decrease) in cash and cash equivalents56false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalsefalseperiodstartlabel1truefalsefalse238000000238falsefalsefalsefalsefalse2truefalsefalse535000000535falsefalsefalsefalsefalse3<
/Id>truefalsefalse290000000290falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash
 equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into wi
th others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 7, 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 8, 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 7
 -Footnote 1

Reference 4: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 1
 -Article 5

falsefalseCash and cash equivalents at beginning of year57false0us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsetruefalseperiodendlabel1true<
/IsNumeric>falsefalse302000000302falsefalsefalsefalsefalse2truefalsefalse238000000238falsefalsefalsefalsefalse3truefalsefalse535000000535falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryIncludes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equiva
lents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with othe
rs, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 7, 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 8, 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 7
 -Footnote 1

Reference 4: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 1
 -Article 5

falsefalseCash and cash equivalents at end of year58true0nee_SupplimentalDisclosuresOfCashFlowInformationAbstractneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseSUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION59false0us-gaap_InterestPaidNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsefalse916000000916falsefalse
falsefalsefalse2truefalsefalse805000000805falsefalsefalsefalsefalse3truefalsefalse764000000764falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period for interest owed on money borrowed, net of interest capitalized.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 27
 -Subparagraph e

falsefalseCash paid for interest (net of amount capitalized)60false0us-gaap_IncomeTaxesPaidNetus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalselabel1truef
alsefalse2000000020falsefalsefalsefalsefalse2truefalsefalse6100000061falsefalsefalsefalsefalse3true<
IsRatio>falsefalse40000004falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 29

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 27
 -Subparagraph f

falsefalseCash paid for income taxes - net61true0nee_SupplimentalScheduleOfNoncashInvestingAndFinancingActivitiesAbstractneefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1f
alsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3false<
/IsNumeric>falsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalseSUPPLEMENTAL SCHEDULE OF NONCASH INVESTING AND FINANCING ACTIVITIES62false0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumedus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse3500000035falsefalsefalsefalsefalse2truefalsefalse00falsefalsefalsefalsefalse3truefalsefalse3100000031falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 95
 -Paragraph 32

falsefalseAssumption of debt in connection with the purchase of independent power projects63false0nee_AccruedPropertyAdditionsneefalsecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse545000000545falsetruefalsefalsefalse2truefalsefalse683000000683falsetruefalsefalsefalse3truefalsefalse448000000448falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseAccrued property additions361CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue