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Fair Value Measurements (Fair Value of Instruments Recorded at Carrying Amount) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets $ 75nee_SpecialUseFundsStormFundAssets $ 75nee_SpecialUseFundsStormFundAssets
Special use funds: nuclear decommissioning fund assets 5,170us-gaap_DecommissioningTrustAssetsAmount 5,091us-gaap_DecommissioningTrustAssetsAmount
Available for sale debt securities amortized cost 1,944us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 1,906us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Available For Sale Securities Equity Securities Amortized Cost 1,388nee_AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost 1,366nee_AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 7 years  
Special Use Funds Storm Fund Weighted Average Maturity 3 years  
Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 558nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
567nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 717nee_OtherInvestmentsFinancialInstrumentsPrimarilyNotesReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
679nee_OtherInvestmentsFinancialInstrumentsPrimarilyNotesReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Long Term Debt Including Current Maturities Fair Value Disclosure 30,544nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
30,337nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long Term Debt Including Current Maturities Fair Value Disclosure 20,296nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
19,973nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 558nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
567nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other Investments Financial Instruments Primarily Notes Receivable Fair Value Disclosure 527nee_OtherInvestmentsFinancialInstrumentsPrimarilyNotesReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
525nee_OtherInvestmentsFinancialInstrumentsPrimarilyNotesReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Long Term Debt Including Current Maturities Fair Value Disclosure 27,716nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
27,876nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
FPL [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Storm Fund Assets 75nee_SpecialUseFundsStormFundAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
75nee_SpecialUseFundsStormFundAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Special use funds: nuclear decommissioning fund assets 3,498us-gaap_DecommissioningTrustAssetsAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
3,449us-gaap_DecommissioningTrustAssetsAmount
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Available for sale debt securities amortized cost 1,550us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
1,519us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Available For Sale Securities Equity Securities Amortized Cost 664nee_AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
664nee_AvailableForSaleSecuritiesEquitySecuritiesAmortizedCost
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity 7 years  
Special Use Funds Storm Fund Weighted Average Maturity 3 years  
FPL [Member] | Estimated Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 385nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
395nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Long Term Debt Including Current Maturities Fair Value Disclosure 11,435nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
11,105nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
FPL [Member] | Carrying Amount [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Special Use Funds Fair Value Disclosure 385nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
395nee_SpecialUseFundsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Long Term Debt Including Current Maturities Fair Value Disclosure $ 9,443nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 9,473nee_LongTermDebtIncludingCurrentMaturitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember