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Derivative Instruments (Income Statement Disclosure) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Effect of Cash Flow Hedges on Results of Operations [Abstract]    
Gains (Losses) Recognized in Other Comprehensive Income (Loss) $ (78)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ (29)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Gains (Losses) Reclassified from Accumulated OCI into Income (22)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet (14)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 226us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet (298)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gains (losses) on commodity contracts, recorded as regulatory assets and or liabilities on the balance sheet due to regulatory treatment (86)nee_GainLossesOnCommodityContractsNotDesignatedAsHedgesRecordedAsRegulatoryAssetsLiabilities 136nee_GainLossesOnCommodityContractsNotDesignatedAsHedgesRecordedAsRegulatoryAssetsLiabilities
Commodity Contract [Member] | Gains (losses) included in operating revenues [Member]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 237us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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(272)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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Commodity Contract [Member] | Gains (losses) included in fuel, purchased power and interchange [Member]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 2us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
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(4)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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Interest Rate Contract [Member]    
Effect of Cash Flow Hedges on Results of Operations [Abstract]    
Gains (Losses) Recognized in Other Comprehensive Income (Loss) (70)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
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(27)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Gains (Losses) Reclassified from Accumulated OCI into Income (20)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
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(16)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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= us-gaap_InterestRateContractMember
Interest Rate Contract [Member] | Gain Loss Included In Interest Expense Member    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (13)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_DerivativeInstrumentRiskAxis
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= nee_GainLossIncludedInInterestExpenseMember
(27)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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Foreign Exchange Contract [Member]    
Effect of Cash Flow Hedges on Results of Operations [Abstract]    
Gains (Losses) Recognized in Other Comprehensive Income (Loss) (8)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
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(2)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
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Gains (Losses) Reclassified from Accumulated OCI into Income (2)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
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2us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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Foreign Exchange Contract [Member] | Gains (losses) included in Other - net [Member]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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5us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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Fair Value Hedging [Member]    
Effect of Cash Flow Hedges on Results of Operations [Abstract]    
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge 16us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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4us-gaap_IncreaseDecreaseInFairValueOfInterestRateFairValueHedgingInstruments1
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= us-gaap_FairValueHedgingMember
Cash Flow Hedging [Member] | Currency Swap [Member] | Gains (losses) included in interest expense [Member]    
Effect of Cash Flow Hedges on Results of Operations [Abstract]    
Gains (Losses) Reclassified from Accumulated OCI into Income $ (3)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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$ (1)us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
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/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
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