1.0.0.3 false CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions false 1 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 2 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 false 3 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 3 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 4 2 fpl_NetIncomeLossConsolidatedProfit fpl false credit duration monetary The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the... false false false false false false false false false 1 true true 1615000000 1615 false false 2 true true 1639000000 1639 false false 3 true true 1312000000 1312 false false The 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. false 5 2 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 6 3 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1765000000 1765 false false 2 false true 1442000000 1442 false false 3 false true 1335000000 1335 false false No definition available. No authoritative reference available. false 7 3 fpl_NuclearFuelAmortization fpl false na duration monetary The current period expense charged against earnings for the amortization of nuclear fuel to recognize its cost over its... false false false false false false false false false 1 false true 239000000 239 false false 2 false true 201000000 201 false false 3 false true 144000000 144 false false The current period expense charged against earnings for the amortization of nuclear fuel to recognize its cost over its useful live. No authoritative reference available. false 8 3 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 59000000 59 false false 2 false true -337000000 -337 false false 3 false true 134000000 134 false false No definition available. No authoritative reference available. false 9 3 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 273000000 273 false false 2 false true 569000000 569 false false 3 false true 402000000 402 false false No definition available. No authoritative reference available. false 10 3 fpl_CostRecoveryClausesAndFranchiseFees fpl false na duration monetary This element represents the net effect on cash flow from operations of the underrecovery or overrecovery of cost recovery... false false false false false false false false false 1 false true 624000000 624 false false 2 false true -111000000 -111 false false 3 false true -75000000 -75 false false This 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. false 11 3 fpl_ChangeInPrepaidOptionPremiumsAndDerivativeSettlements fpl false na duration monetary This element represents the net effect on cash flow from operations from the change in prepaid option premiums and the... false false false false false false false false false 1 false true -11000000 -11 false false 2 false true -12000000 -12 false false 3 false true 159000000 159 false false This 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. false 12 3 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -52000000 -52 false false 2 false true -93000000 -93 false false 3 false true -68000000 -68 false false No definition available. No authoritative reference available. false 13 3 us-gaap_EquityMethodInvestmentDividendsOrDistributions us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 69000000 69 false false 2 false true 124000000 124 false false 3 false true 175000000 175 false false No definition available. No authoritative reference available. false 14 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 15 3 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 18000000 18 false false 2 false true 49000000 49 false false 3 false true -216000000 -216 false false No definition available. No authoritative reference available. false 16 3 us-gaap_IncreaseDecreaseInOtherReceivables us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -13000000 -13 false false 2 false true -26000000 -26 false false 3 false true -14000000 -14 false false No definition available. No authoritative reference available. false 17 3 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 85000000 85 false false 2 false true -106000000 -106 false false 3 false true -14000000 -14 false false No definition available. No authoritative reference available. false 18 3 fpl_OtherCurrentAssets fpl false na duration monetary The net change during the reporting period in other operating current assets not otherwise defined in the taxonomy. false false false false false false false false false 1 false true 9000000 9 false false 2 false true -31000000 -31 false false 3 false true -14000000 -14 false false The net change during the reporting period in other operating current assets not otherwise defined in the taxonomy. No authoritative reference available. false 19 3 fpl_OtherOperatingAssetsNoncurrent fpl false na duration monetary The net change during the reporting period in other operating noncurrent assets not otherwise defined in the taxonomy. false false false false false false false false false 1 false true -103000000 -103 false false 2 false true -166000000 -166 false false 3 false true -100000000 -100 false false The net change during the reporting period in other operating noncurrent assets not otherwise defined in the taxonomy. No authoritative reference available. false 20 3 us-gaap_IncreaseDecreaseInAccountsPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -86000000 -86 false false 2 false true -120000000 -120 false false 3 false true 63000000 63 false false No definition available. No authoritative reference available. false 21 3 us-gaap_IncreaseDecreaseInCustomerDeposits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 38000000 38 false false 2 false true 37000000 37 false false 3 false true 29000000 29 false false No definition available. No authoritative reference available. false 22 3 fpl_MarginCashCollateral fpl false na duration monetary This element represents the net effect on cash flow from operations from the change in "Margin Deposit Assets", as defined in... false false false false false false false false false 1 false true -110000000 -110 false false 2 false true 49000000 49 false false 3 false true 86000000 86 false false This 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. false 23 3 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 8000000 8 false false 2 false true -17000000 -17 false false 3 false true -75000000 -75 false false No definition available. No authoritative reference available. false 24 3 fpl_InterestAndOtherTaxes fpl false na duration monetary The net change during the reporting period in interest payable, which represents the amount owed to note holders, bond... false false false false false false false false false 1 false true 22000000 22 false false 2 false true 30000000 30 false false 3 false true 49000000 49 false false The 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. false 25 3 fpl_OtherCurrentLiabilities fpl false na duration monetary The net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy. false false false false false false false false false 1 false true -45000000 -45 false false 2 false true 189000000 189 false false 3 false true 113000000 113 false false The net change during the reporting period in other current operating obligations not otherwise defined in the taxonomy. No authoritative reference available. false 26 3 fpl_OtherLiabilitiesNotOtherwiseDefined fpl false na duration monetary The net change during the reporting period in other noncurrent operating obligations not otherwise defined in the taxonomy. false false false false false false false false false 1 false true -5000000 -5 false false 2 false true -61000000 -61 false false 3 false true -52000000 -52 false false The net change during the reporting period in other noncurrent operating obligations not otherwise defined in the taxonomy. No authoritative reference available. false 27 2 us-gaap_OtherNoncashExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 64000000 64 false false 2 false true 154000000 154 false false 3 false true 220000000 220 false false No definition available. No authoritative reference available. false 28 2 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 4463000000 4463 false false 2 false true 3403000000 3403 false false 3 false true 3593000000 3593 false false No definition available. No authoritative reference available. true 29 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 30 2 fpl_CapitalExpendituresOfFpl fpl false na duration monetary The cash outflow for capital expenditures of a public utility for electric utility plant and equipment. Amount includes the... false false false false false false false false false 1 false true -2522000000 -2522 false false 2 false true -2234000000 -2234 false false 3 false true -1826000000 -1826 false false The 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. false 31 2 fpl_IndependentPowerInvestments fpl false na duration monetary The cash outflow for capital expenditures related to independent power projects of a non-utility company. Amount includes... false false false false false false false false false 1 false true -3068000000 -3068 false false 2 false true -2715000000 -2715 false false 3 false true -2852000000 -2852 false false The 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. false 32 2 fpl_CashGrantsUnderAmericanRecoveryAndReinvestmentActOf fpl false na duration monetary Cash grants under the American Recovery and Reinvestment Act of 2009 false false false false false false false false false 1 false true 100000000 100 false false 2 false true 0 0 false false 3 false true 0 0 false false Cash grants under the American Recovery and Reinvestment Act of 2009 No authoritative reference available. false 33 2 fpl_FundsReceivedFromSpentFuelSettlementAgreement fpl false na duration monetary Funds received from the US government related to property, plant and equipment costs in settlement of lawsuits against the US... false false false false false false false false false 1 false true 86000000 86 false false 2 false true 0 0 false false 3 false true 0 0 false false Funds 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. false 34 2 us-gaap_PaymentsForProceedsFromNuclearFuel us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -362000000 -362 false false 2 false true -247000000 -247 false false 3 false true -310000000 -310 false false No definition available. No authoritative reference available. false 35 2 fpl_OtherCapitalExpenditures fpl false na duration monetary The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or... false false false false false false false false false 1 false true -54000000 -54 false false 2 false true -40000000 -40 false false 3 false true -31000000 -31 false false The 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. false 36 2 fpl_SaleOfIndependentPowerInvestments fpl false na duration monetary The cash inflow from the sales related to independent power projects of a non-utility company. false false false false false false false false false 1 false true 15000000 15 false false 2 false true 25000000 25 false false 3 false true 700000000 700 false false The cash inflow from the sales related to independent power projects of a non-utility company. No authoritative reference available. false 37 2 fpl_LoanRepaymentsAndCapitalDistributionsFromEquityMethodInvestees fpl false na duration monetary The cash inflow from the loan repayments of equity method investeesm and other distributions from equity method investees,... false false false false false false false false false 1 false true 0 0 false false 2 false true 0 0 false false 3 false true 11000000 11 false false The 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. false 38 2 fpl_ProceedsFromSaleOfSecuritiesInSpecialUseFunds fpl false na duration monetary Proceeds from the sale and maturity of securities held in nuclear decommissioning trust funds and a regulated utility's storm... false false false false false false false false false 1 false true 4592000000 4592 false false 2 false true 2235000000 2235 false false 3 false true 2211000000 2211 false false Proceeds 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. false 39 2 fpl_PurchasesOfSecuritiesInSpecialUseFunds fpl false na duration monetary Purchases of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds. false false false false false false false false false 1 false true -4710000000 -4710 false false 2 false true -2315000000 -2315 false false 3 false true -2440000000 -2440 false false Purchases of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds. No authoritative reference available. false 40 2 fpl_ProceedsFromSaleOfOtherSecurities fpl false na duration monetary Proceeds from the sale and maturity of securities held by an entity excluding securities held in nuclear decommissioning... false false false false false false false false false 1 false true 773000000 773 false false 2 false true 28000000 28 false false 3 false true 138000000 138 false false Proceeds 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. false 41 2 fpl_PurchasesOfOtherSecurities fpl false na duration monetary Purchases of securities held by an entity excluding securities held in nuclear decommissioning trust funds and a regulated... false false false false false false false false false 1 false true -782000000 -782 false false 2 false true -84000000 -84 false false 3 false true -156000000 -156 false false Purchases 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. false 42 2 us-gaap_PaymentsToAcquireOtherLoansAndLeasesHeldForInvestment us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 0 0 false false 2 false true -500000000 -500 false false 3 false true 0 0 false false No definition available. No authoritative reference available. false 43 2 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -3000000 -3 false false 2 false true 39000000 39 false false 3 false true -23000000 -23 false false No definition available. No authoritative reference available. false 44 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -5935000000 -5935 false false 2 false true -5808000000 -5808 false false 3 false true -4578000000 -4578 false false No definition available. No authoritative reference available. true 45 1 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 46 2 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 3220000000 3220 false false 2 false true 3827000000 3827 false false 3 false true 3199000000 3199 false false No definition available. No authoritative reference available. false 47 2 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1635000000 -1635 false false 2 false true -1358000000 -1358 false false 3 false true -1866000000 -1866 false false No definition available. No authoritative reference available. false 48 2 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 154000000 154 false false 2 false true 848000000 848 false false 3 false true -80000000 -80 false false No definition available. No authoritative reference available. false 49 2 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 198000000 198 false false 2 false true 41000000 41 false false 3 false true 46000000 46 false false No definition available. No authoritative reference available. false 50 2 us-gaap_PaymentsOfDividends us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -766000000 -766 false false 2 false true -714000000 -714 false false 3 false true -654000000 -654 false false No definition available. No authoritative reference available. false 51 2 fpl_ChangeInFundsHeldForStormRecoveryBondPayments fpl false na duration monetary The net change during the reporting period in funds held in restricted cash for storm-recovery bond payments. false false false false false false false false false 1 false true 5000000 5 false false 2 false true 0 0 false false 3 false true -42000000 -42 false false The net change during the reporting period in funds held in restricted cash for storm-recovery bond payments. No authoritative reference available. false 52 2 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -1000000 -1 false false 2 false true 6000000 6 false false 3 false true 52000000 52 false false No definition available. No authoritative reference available. false 53 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1175000000 1175 false false 2 false true 2650000000 2650 false false 3 false true 655000000 655 false false No definition available. No authoritative reference available. true 54 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -297000000 -297 false false 2 false true 245000000 245 false false 3 false true -330000000 -330 false false No definition available. No authoritative reference available. false 55 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false true false false 1 false true 535000000 535 false false 2 false true 290000000 290 false false 3 false true 620000000 620 false false No definition available. No authoritative reference available. false 56 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 false true 238000000 238 false false 2 false true 535000000 535 false false 3 false true 290000000 290 false false No definition available. No authoritative reference available. false 57 1 fpl_SupplimentalDisclosuresOfCashFlowInformationAbstract fpl false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 58 2 us-gaap_InterestPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 805000000 805 false false 2 false true 764000000 764 false false 3 false true 686000000 686 false false No definition available. No authoritative reference available. false 59 2 us-gaap_IncomeTaxesPaidNet us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 61000000 61 false false 2 false true 4000000 4 false false 3 false true 46000000 46 false false No definition available. No authoritative reference available. false 60 1 fpl_SupplimentalScheduleOfNoncashInvestingAndFinancingActivitiesAbstract fpl false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false 2 false false 0 0 false false 3 false false 0 0 false false No definition available. false 61 2 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed us-gaap true credit instant monetary No definition available. false false false false false false false false false 1 true true 0 0 false false 2 true true 31000000 31 false false 3 true true 55000000 55 false false No definition available. No authoritative reference available. false false 3 59 false Millions UnKnown UnKnown false true