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Fair Value Measurements (Available for Sale Securities) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Realized gains $ 211us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 246us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ 252us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Realized losses 115us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 88us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 67us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Proceeds from sale and maturity of Available-for-sale Securities 4,092us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 4,190us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds 5,028us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
FPL [Member]      
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Realized gains 120us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 182us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 98us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Realized losses 94us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 59us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 46us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Proceeds from sale and maturity of Available-for-sale Securities 3,349us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 3,342us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 3,790us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Available For Sale Securities: Special Use Funds - Equity Securities [Member]      
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Unrealized gains 1,267us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsEquitySecuritiesMember		 1,125us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsEquitySecuritiesMember		  
Available For Sale Securities: Special Use Funds - Equity Securities [Member] | FPL [Member]      
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Unrealized gains 896us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsEquitySecuritiesMember		 777us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsEquitySecuritiesMember		  
Available for sale securities: Special Use Funds - Debt Securities [Member]      
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Unrealized gains 66us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 42us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		  
Unrealized losses 7us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 [1] 32us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 [1]  
Fair Value 542us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 1,069us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		  
Available for sale securities: Special Use Funds - Debt Securities [Member] | FPL [Member]      
Schedule of Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds [Line Items]      
Unrealized gains 54us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 36us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		  
Unrealized losses 5us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 [1] 25us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 [1]  
Fair Value $ 434us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		 $ 844us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= nee_AvailableForSaleSecuritiesSpecialUseFundsDebtSecuritiesMember		  
[1] Unrealized losses on available for sale debt securities for securities in an unrealized loss position for greater than twelve months at December 31, 2014 and 2013 were not material to NEE or FPL.