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Commitments and Contingencies (Spain Solar Projects) (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
NEER [Member]
USD ($)
Dec. 31, 2014
Capital Holdings [Member]
USD ($)
Dec. 31, 2014
Standby Letters of Credit [Member]
Capital Holdings [Member]
USD ($)
Dec. 31, 2014
Standby Letters of Credit [Member]
Capital Holdings [Member]
EUR (€)
Dec. 31, 2014
Spain Solar Revenue Adjustment [Domain]
NEER [Member]
USD ($)
Loss Contingencies [Line Items]          
Amount of debt outstanding under financing agreements related to Spain solar projects $ 647nee_AmountOfDebtOutstandingUnderFinancingAgreementsRelatedToSpainSolarProjects
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
       
Amount of noncurrent derivative liability classified as current derivative liability due to event of default. 125nee_Amountofnoncurrentderivativeliabilityclassifiedascurrentderivativeliabilityduetoeventofdefault.
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
       
Revenues         19us-gaap_Revenues
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_RestatementAdjustmentMember
Letters of Credit Outstanding, Amount   $ 843us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= nee_CapitalHoldingsMember
$ 45us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= nee_CapitalHoldingsMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
€ 37us-gaap_LettersOfCreditOutstandingAmount
/ dei_LegalEntityAxis
= nee_CapitalHoldingsMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember