1.0.0.3 false CONDENSED 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 5 3 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 No definition available. false 6 4 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 1267000000 1267 false false 2 true true 1232000000 1232 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 7 4 fpl_AdjustmentsToReconcileNetIncomeToNetCashProvidedByUsedInOperatingActivitiesAbstract 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 No definition available. false 8 5 us-gaap_DepreciationAndAmortization us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 1248000000 1248 false false 2 false true 1025000000 1025 false false No definition available. No authoritative reference available. false 9 5 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 186000000 186 false false 2 false true 146000000 146 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 10 5 fpl_RecoverableStormRelatedCostsOfFpl fpl false na duration monetary The amount of cash expended or subsequently received back from ratepayers, any available storm funds or from insurance... false false false false false false false false false 1 false true -16000000 -16 false false 2 false true 47000000 47 false false The amount of cash expended or subsequently received back from ratepayers, any available storm funds or from insurance companies for storm damage costs. No authoritative reference available. false 11 5 fpl_StormCostAmortization fpl false na duration monetary The amortization of securitized storm-recovery costs as storm-recovery charges are billed to customers. false false false false false false false false false 1 false true 29000000 29 false false 2 false true 46000000 46 false false The amortization of securitized storm-recovery costs as storm-recovery charges are billed to customers. No authoritative reference available. false 12 5 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 63000000 63 false false 2 false true -170000000 -170 false false No definition available. No authoritative reference available. false 13 5 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 182000000 182 false false 2 false true 508000000 508 false false No definition available. No authoritative reference available. false 14 5 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 417000000 417 false false 2 false true -465000000 -465 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 15 5 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 -6000000 -6 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 16 5 us-gaap_IncomeLossFromEquityMethodInvestments us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -49000000 -49 false false 2 false true -85000000 -85 false false No definition available. No authoritative reference available. false 17 5 us-gaap_EquityMethodInvestmentDividendsOrDistributions us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 33000000 33 false false 2 false true 50000000 50 false false No definition available. No authoritative reference available. false 18 4 fpl_ChangesInOperatingAssetsAndLiabilitiesAbstract 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 No definition available. false 19 5 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -146000000 -146 false false 2 false true -235000000 -235 false false No definition available. No authoritative reference available. false 20 5 us-gaap_IncreaseDecreaseInOtherReceivables us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 14000000 14 false false 2 false true -6000000 -6 false false No definition available. No authoritative reference available. false 21 5 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 74000000 74 false false 2 false true -156000000 -156 false false No definition available. No authoritative reference available. false 22 5 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 -32000000 -32 false false 2 false true -47000000 -47 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 23 5 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 -44000000 -44 false false 2 false true -108000000 -108 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 24 5 us-gaap_IncreaseDecreaseInAccountsPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -99000000 -99 false false 2 false true 234000000 234 false false No definition available. No authoritative reference available. false 25 5 us-gaap_IncreaseDecreaseInCustomerDeposits us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 26000000 26 false false 2 false true 27000000 27 false false No definition available. No authoritative reference available. false 26 5 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 -191000000 -191 false false 2 false true 28000000 28 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 27 5 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 39000000 39 false false 2 false true -173000000 -173 false false No definition available. No authoritative reference available. false 28 5 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 229000000 229 false false 2 false true 242000000 242 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 29 5 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 -61000000 -61 false false 2 false true 73000000 73 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 30 5 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 8000000 8 false false 2 false true -15000000 -15 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 31 4 us-gaap_OtherNoncashExpense us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 138000000 138 false false 2 false true 167000000 167 false false No definition available. No authoritative reference available. false 32 4 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true 3326000000 3326 false false 2 false true 2359000000 2359 false false No definition available. No authoritative reference available. true 33 3 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 No definition available. false 34 4 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 -1841000000 -1841 false false 2 false true -1665000000 -1665 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 35 4 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 -1884000000 -1884 false false 2 false true -1854000000 -1854 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 36 4 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 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 37 4 us-gaap_PaymentsForProceedsFromNuclearFuel us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -278000000 -278 false false 2 false true -164000000 -164 false false No definition available. No authoritative reference available. false 38 4 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 -37000000 -37 false false 2 false true -32000000 -32 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 39 4 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 0 0 false false The cash inflow from the sales related to independent power projects of a non-utility company. No authoritative reference available. false 40 4 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 2713000000 2713 false false 2 false true 1718000000 1718 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 41 4 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 -2783000000 -2783 false false 2 false true -1797000000 -1797 false false Purchases of securities held in nuclear decommissioning trust funds and a regulated utility's storm restoration funds. No authoritative reference available. false 42 4 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 542000000 542 false false 2 false true 84000000 84 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 43 4 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 -556000000 -556 false false 2 false true -188000000 -188 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 44 4 us-gaap_PaymentsForProceedsFromOtherInvestingActivities us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true 5000000 5 false false 2 false true 41000000 41 false false No definition available. No authoritative reference available. false 45 4 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -4018000000 -4018 false false 2 false true -3857000000 -3857 false false No definition available. No authoritative reference available. true 46 3 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 No definition available. false 47 4 us-gaap_ProceedsFromIssuanceOfLongTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 2389000000 2389 false false 2 false true 2587000000 2587 false false No definition available. No authoritative reference available. false 48 4 us-gaap_RepaymentsOfLongTermDebt us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -1412000000 -1412 false false 2 false true -1324000000 -1324 false false No definition available. No authoritative reference available. false 49 4 us-gaap_ProceedsFromRepaymentsOfShortTermDebt us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -284000000 -284 false false 2 false true 2023000000 2023 false false No definition available. No authoritative reference available. false 50 4 us-gaap_ProceedsFromIssuanceOfCommonStock us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 186000000 186 false false 2 false true 32000000 32 false false No definition available. No authoritative reference available. false 51 4 us-gaap_PaymentsOfDividends us-gaap true credit duration monetary No definition available. false false false false false false false false false 1 false true -574000000 -574 false false 2 false true -535000000 -535 false false No definition available. No authoritative reference available. false 52 4 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 18000000 18 false false 2 false true 14000000 14 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 53 4 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true -2000000 -2 false false 2 false true 3000000 3 false false No definition available. No authoritative reference available. false 54 4 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration monetary No definition available. false false false false false false false false false 1 false true 321000000 321 false false 2 false true 2800000000 2800 false false No definition available. No authoritative reference available. true 55 3 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration monetary No definition available. false false false false false false false false false 1 false true -371000000 -371 false false 2 false true 1302000000 1302 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 true false false 1 false true 535000000 535 false false 2 false true 290000000 290 false false No definition available. No authoritative reference available. false 57 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant monetary No definition available. false false false false false false false true false 1 true true 164000000 164 false false 2 true true 1592000000 1592 false false No definition available. No authoritative reference available. false false 2 53 false Millions UnKnown UnKnown false true