1.0.0.3falseCONSOLIDATED STATEMENT OF CASH FLOWS (USD $)In Millionsfalse1$falsefalseu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0false2$falsefalseu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli0false3$falsefalseu000Standardhttp://www.xbrl.org/2003/iso4217USDiso42170u001Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0u002Standardhttp://www.xbrl.org/2003/instancesharesxbrli031us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false42fpl_NetIncomeLossConsolidatedProfitfplfalsecreditdurationmonetaryThe portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the...falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue16150000001615falsefalse2truetrue16390000001639falsefalse3truetrue13120000001312falsefalseThe portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.No authoritative reference available.false52us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false63us-gaap_DepreciationAndAmortizationus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue17650000001765falsefalse2falsetrue14420000001442falsefalse3falsetrue13350000001335falsefalseNo definition available.No authoritative reference available.false73fpl_NuclearFuelAmortizationfplfalsenadurationmonetaryThe current period expense charged against earnings for the amortization of nuclear fuel to recognize its cost over its...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue239000000239falsefalse2falsetrue201000000201falsefalse3falsetrue144000000144falsefalseThe current period expense charged against earnings for the amortization of nuclear fuel to recognize its cost over its useful live.No authoritative reference available.false83us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContractsus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue5900000059falsefalse2falsetrue-337000000-337falsefalse3falsetrue134000000134falsefalseNo definition available.No authoritative reference available.false93us-gaap_DeferredIncomeTaxExpenseBenefitus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue273000000273falsefalse2falsetrue569000000569falsefalse3falsetrue402000000402falsefalseNo definition available.No authoritative reference available.false103fpl_CostRecoveryClausesAndFranchiseFeesfplfalsenadurationmonetaryThis element represents the net effect on cash flow from operations of the underrecovery or overrecovery of cost recovery...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue624000000624falsefalse2falsetrue-111000000-111falsefalse3falsetrue-75000000-75falsefalseThis element represents the net effect on cash flow from operations of the underrecovery or overrecovery of cost recovery clauses and franchise fees.No authoritative reference available.false113fpl_ChangeInPrepaidOptionPremiumsAndDerivativeSettlementsfplfalsenadurationmonetaryThis element represents the net effect on cash flow from operations from the change in prepaid option premiums and the...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-11000000-11falsefalse2falsetrue-12000000-12falsefalse3falsetrue159000000159falsefalseThis element represents the net effect on cash flow from operations from the change in prepaid option premiums and the settlement of derivative contracts.No authoritative reference available.false123us-gaap_IncomeLossFromEquityMethodInvestmentsus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-52000000-52falsefalse2falsetrue-93000000-93falsefalse3falsetrue-68000000-68falsefalseNo definition available.No authoritative reference available.false133us-gaap_EquityMethodInvestmentDividendsOrDistributionsus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue6900000069falsefalse2falsetrue124000000124falsefalse3falsetrue175000000175falsefalseNo definition available.No authoritative reference available.false142us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false153us-gaap_IncreaseDecreaseInAccountsReceivableus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1800000018falsefalse2falsetrue4900000049falsefalse3falsetrue-216000000-216falsefalseNo definition available.No authoritative reference available.false163us-gaap_IncreaseDecreaseInOtherReceivablesus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-13000000-13falsefalse2falsetrue-26000000-26falsefalse3falsetrue-14000000-14falsefalseNo definition available.No authoritative reference available.false173us-gaap_IncreaseDecreaseInInventoriesus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue8500000085falsefalse2falsetrue-106000000-106falsefalse3falsetrue-14000000-14falsefalseNo definition available.No authoritative reference available.false183fpl_OtherCurrentAssetsfplfalsenadurationmonetaryThe net change during the reporting period in other operating current assets not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue90000009falsefalse2falsetrue-31000000-31falsefalse3falsetrue-14000000-14falsefalseThe net change during the reporting period in other operating current assets not otherwise defined in the taxonomy.No authoritative reference available.false193fpl_OtherOperatingAssetsNoncurrentfplfalsenadurationmonetaryThe net change during the reporting period in other operating noncurrent assets not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-103000000-103falsefalse2falsetrue-166000000-166falsefalse3falsetrue-100000000-100falsefalseThe net change during the reporting period in other operating noncurrent assets not otherwise defined in the taxonomy.No authoritative reference available.false203us-gaap_IncreaseDecreaseInAccountsPayableus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-86000000-86falsefalse2falsetrue-120000000-120falsefalse3falsetrue6300000063falsefalseNo definition available.No authoritative reference available.false213us-gaap_IncreaseDecreaseInCustomerDepositsus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue3800000038falsefalse2falsetrue3700000037falsefalse3falsetrue2900000029falsefalseNo definition available.No authoritative reference available.false223fpl_MarginCashCollateralfplfalsenadurationmonetaryThis element represents the net effect on cash flow from operations from the change in "Margin Deposit Assets", as defined in...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-110000000-110falsefalse2falsetrue4900000049falsefalse3falsetrue8600000086falsefalseThis element represents the net effect on cash flow from operations from the change in "Margin Deposit Assets", as defined in the UGT, and from the change in the amount of cash placed on deposit with the company by counterparties as security for trading or derivative contracts.No authoritative reference available.false233us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayableus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue80000008falsefalse2falsetrue-17000000-17falsefalse3falsetrue-75000000-75falsefalseNo definition available.No authoritative reference available.false243fpl_InterestAndOtherTaxesfplfalsenadurationmonetaryThe net change during the reporting period in interest payable, which represents the amount owed to note holders, bond...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue2200000022falsefalse2falsetrue3000000030falsefalse3falsetrue4900000049falsefalseThe net change during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity. AND The net change during the period in the amount of cash payments due to taxing authorities for nonincome-related taxes.No authoritative reference available.false253fpl_OtherCurrentLiabilitiesfplfalsenadurationmonetaryThe net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-45000000-45falsefalse2falsetrue189000000189falsefalse3falsetrue113000000113falsefalseThe net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy.No authoritative reference available.false263fpl_OtherLiabilitiesNotOtherwiseDefinedfplfalsenadurationmonetaryThe net change during the reporting period in other noncurrent operating obligations not otherwise defined in the taxonomy.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-5000000-5falsefalse2falsetrue-61000000-61falsefalse3falsetrue-52000000-52falsefalseThe net change during the reporting period in other noncurrent operating obligations not otherwise defined in the taxonomy.No authoritative reference available.false272us-gaap_OtherNoncashExpenseus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue6400000064falsefalse2falsetrue154000000154falsefalse3falsetrue220000000220falsefalseNo definition available.No authoritative reference available.false282us-gaap_NetCashProvidedByUsedInOperatingActivitiesus-gaaptruenadurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue44630000004463falsefalse2falsetrue34030000003403falsefalse3falsetrue35930000003593falsefalseNo definition available.No authoritative reference available.true291us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false302fpl_CapitalExpendituresOfFplfplfalsenadurationmonetaryThe cash outflow for capital expenditures of a public utility for electric utility plant and equipment. Amount includes the...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-2522000000-2522falsefalse2falsetrue-2234000000-2234falsefalse3falsetrue-1826000000-1826falsefalseThe 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.false312fpl_IndependentPowerInvestmentsfplfalsenadurationmonetaryThe cash outflow for capital expenditures related to independent power projects of a non-utility company. Amount includes...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-3068000000-3068falsefalse2falsetrue-2715000000-2715falsefalse3falsetrue-2852000000-2852falsefalseThe cash outflow for capital expenditures related to independent power projects of a non-utility company. Amount includes capitalized interest and spending on equity method investees accounted for under the equity method of accounting but excludes expenditures related to nuclear fuel, which has a separate taxonomy.No authoritative reference available.false322fpl_CashGrantsUnderAmericanRecoveryAndReinvestmentActOffplfalsenadurationmonetaryCash grants under the American Recovery and Reinvestment Act of 2009falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue100000000100falsefalse2falsetrue00falsefalse3falsetrue00falsefalseCash grants under the American Recovery and Reinvestment Act of 2009No authoritative reference available.false332fpl_FundsReceivedFromSpentFuelSettlementAgreementfplfalsenadurationmonetaryFunds received from the US government related to property, plant and equipment costs in settlement of lawsuits against the US...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue8600000086falsefalse2falsetrue00falsefalse3falsetrue00falsefalseFunds received from the US government related to property, plant and equipment costs in settlement of lawsuits against the US Department of Energy for failure to dispose of spent nuclear fuel.No authoritative reference available.false342us-gaap_PaymentsForProceedsFromNuclearFuelus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-362000000-362falsefalse2falsetrue-247000000-247falsefalse3falsetrue-310000000-310falsefalseNo definition available.No authoritative reference available.false352fpl_OtherCapitalExpendituresfplfalsenadurationmonetaryThe cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-54000000-54falsefalse2falsetrue-40000000-40falsefalse3falsetrue-31000000-31falsefalseThe cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, of the company's non reportable segments.No authoritative reference available.false362fpl_SaleOfIndependentPowerInvestmentsfplfalsenadurationmonetaryThe cash inflow from the sales related to independent power projects of a non-utility company.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue1500000015falsefalse2falsetrue2500000025falsefalse3falsetrue700000000700falsefalseThe cash inflow from the sales related to independent power projects of a non-utility company.No authoritative reference available.false372fpl_LoanRepaymentsAndCapitalDistributionsFromEquityMethodInvesteesfplfalsenadurationmonetaryThe cash inflow from the loan repayments of equity method investeesm and other distributions from equity method investees,...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue00falsefalse2falsetrue00falsefalse3falsetrue1100000011falsefalseThe cash inflow from the loan repayments of equity method investeesm and other distributions from equity method investees, accounted for under the equity method of accounting, that constitutes a return of investment.No authoritative reference available.false382fpl_ProceedsFromSaleOfSecuritiesInSpecialUseFundsfplfalsenadurationmonetaryProceeds from the sale and maturity of securities held in nuclear decommissioning trust funds and a regulated utility's storm...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue45920000004592falsefalse2falsetrue22350000002235falsefalse3falsetrue22110000002211falsefalseProceeds from the sale and maturity of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds.No authoritative reference available.false392fpl_PurchasesOfSecuritiesInSpecialUseFundsfplfalsenadurationmonetaryPurchases of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-4710000000-4710falsefalse2falsetrue-2315000000-2315falsefalse3falsetrue-2440000000-2440falsefalsePurchases of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds.No authoritative reference available.false402fpl_ProceedsFromSaleOfOtherSecuritiesfplfalsenadurationmonetaryProceeds from the sale and maturity of securities held by an entity excluding securities held in nuclear decommissioning...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue773000000773falsefalse2falsetrue2800000028falsefalse3falsetrue138000000138falsefalseProceeds from the sale and maturity of securities held by an entity excluding securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds, which are reported in a separate taxonomy.No authoritative reference available.false412fpl_PurchasesOfOtherSecuritiesfplfalsenadurationmonetaryPurchases of securities held by an entity excluding securities held in nuclear decommissioning trust funds and a regulated...falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-782000000-782falsefalse2falsetrue-84000000-84falsefalse3falsetrue-156000000-156falsefalsePurchases of securities held by an entity excluding securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds, which are reported in a separate taxonomy.No authoritative reference available.false422us-gaap_PaymentsToAcquireOtherLoansAndLeasesHeldForInvestmentus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue00falsefalse2falsetrue-500000000-500falsefalse3falsetrue00falsefalseNo definition available.No authoritative reference available.false432us-gaap_PaymentsForProceedsFromOtherInvestingActivitiesus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-3000000-3falsefalse2falsetrue3900000039falsefalse3falsetrue-23000000-23falsefalseNo definition available.No authoritative reference available.false442us-gaap_NetCashProvidedByUsedInInvestingActivitiesus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-5935000000-5935falsefalse2falsetrue-5808000000-5808falsefalse3falsetrue-4578000000-4578falsefalseNo definition available.No authoritative reference available.true451us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstractus-gaaptruenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false462us-gaap_ProceedsFromIssuanceOfLongTermDebtus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue32200000003220falsefalse2falsetrue38270000003827falsefalse3falsetrue31990000003199falsefalseNo definition available.No authoritative reference available.false472us-gaap_RepaymentsOfLongTermDebtus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-1635000000-1635falsefalse2falsetrue-1358000000-1358falsefalse3falsetrue-1866000000-1866falsefalseNo definition available.No authoritative reference available.false482us-gaap_ProceedsFromRepaymentsOfShortTermDebtus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue154000000154falsefalse2falsetrue848000000848falsefalse3falsetrue-80000000-80falsefalseNo definition available.No authoritative reference available.false492us-gaap_ProceedsFromIssuanceOfCommonStockus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue198000000198falsefalse2falsetrue4100000041falsefalse3falsetrue4600000046falsefalseNo definition available.No authoritative reference available.false502us-gaap_PaymentsOfDividendsus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-766000000-766falsefalse2falsetrue-714000000-714falsefalse3falsetrue-654000000-654falsefalseNo definition available.No authoritative reference available.false512fpl_ChangeInFundsHeldForStormRecoveryBondPaymentsfplfalsenadurationmonetaryThe net change during the reporting period in funds held in restricted cash for storm-recovery bond payments.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue50000005falsefalse2falsetrue00falsefalse3falsetrue-42000000-42falsefalseThe net change during the reporting period in funds held in restricted cash for storm-recovery bond payments.No authoritative reference available.false522us-gaap_ProceedsFromPaymentsForOtherFinancingActivitiesus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-1000000-1falsefalse2falsetrue60000006falsefalse3falsetrue5200000052falsefalseNo definition available.No authoritative reference available.false532us-gaap_NetCashProvidedByUsedInFinancingActivitiesus-gaaptruedebitdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue11750000001175falsefalse2falsetrue26500000002650falsefalse3falsetrue655000000655falsefalseNo definition available.No authoritative reference available.true541us-gaap_CashAndCashEquivalentsPeriodIncreaseDecreaseus-gaaptruenadurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue-297000000-297falsefalse2falsetrue245000000245falsefalse3falsetrue-330000000-330falsefalseNo definition available.No authoritative reference available.false551us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantmonetaryNo definition available.falsefalsefalsefalsefalsefalsetruefalsefalse1falsetrue535000000535falsefalse2falsetrue290000000290falsefalse3falsetrue620000000620falsefalseNo definition available.No authoritative reference available.false561us-gaap_CashAndCashEquivalentsAtCarryingValueus-gaaptruedebitinstantmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsetruefalse1falsetrue238000000238falsefalse2falsetrue535000000535falsefalse3falsetrue290000000290falsefalseNo definition available.No authoritative reference available.false571fpl_SupplimentalDisclosuresOfCashFlowInformationAbstractfplfalsenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false582us-gaap_InterestPaidNetus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue805000000805falsefalse2falsetrue764000000764falsefalse3falsetrue686000000686falsefalseNo definition available.No authoritative reference available.false592us-gaap_IncomeTaxesPaidNetus-gaaptruecreditdurationmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1falsetrue6100000061falsefalse2falsetrue40000004falsefalse3falsetrue4600000046falsefalseNo definition available.No authoritative reference available.false601fpl_SupplimentalScheduleOfNoncashInvestingAndFinancingActivitiesAbstractfplfalsenadurationstringNo definition available.falsefalsefalsefalsefalsetruefalsefalsefalse1falsefalse00falsefalse2falsefalse00falsefalse3falsefalse00falsefalseNo definition available.false612us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumedus-gaaptruecreditinstantmonetaryNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalse1truetrue00falsefalse2truetrue3100000031falsefalse3truetrue5500000055falsefalseNo definition available.No authoritative reference available.falsefalse359falseMillionsUnKnownUnKnownfalsetrue