Commitments and Contingencies (Spain Solar Projects) (Details) (NextEra Energy Resources [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013
NextEra Energy Resources [Member]
Loss Contingencies [Line Items]
Amount of debt outstanding under financing agreements related to Spain solar projects	$ 784
Amount of noncurrent derivative liability classified as current derivative liability due to event of default	91
Amount outstanding under revolving loan agreement of NEECH and NEE Espana	202
Remaining equity funding commitment related to Spain solar projects	12
Amount of gross derivative liability related to Spain solar projects	$ 161

Amount of debt outstanding under financing agreements related to Spain solar projects

No definition available.

Name:	nee_AmountOfDebtOutstandingUnderFinancingAgreementsRelatedToSpainSolarProjects
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of gross derivative liability related to Spain solar projects

No definition available.

Name:	nee_AmountOfGrossDerivativeLiabilityRelatedToSpainSolarProjects
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of noncurrent derivative liability classified as current derivative liability due to event of default.

No definition available.

Name:	nee_Amountofnoncurrentderivativeliabilityclassifiedascurrentderivativeliabilityduetoeventofdefault.
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount outstanding under revolving loan agreement of NEECH and NEE Espana

No definition available.

Name:	nee_AmountoutstandingunderrevolvingloanagreementofNEECHandNEEEspana
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Remaining equity funding commitment related to Spain Solar projects

No definition available.

Name:	nee_RemainingEquityFundingCommitmentRelatedToSpainSolarProjects
Namespace Prefix:	nee_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration