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2.2.0.7 true Variable Interest Entities (Detail) (USD $) 009070 - Disclosure - Variable Interest Entities (Detail) true false In Millions false false 1 USD false false u002 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ false 2 USD true false false false Variable Interest Entity Bankruptcy Remote Special Purpose Subsidiary Primary Beneficiary [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntityBankruptcyRemoteSpecialPurposeSubsidiaryPrimaryBeneficiaryMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false Variable Interest Entity Bankruptcy Remote Special Purpose Subsidiary Primary Beneficiary [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntityBankruptcyRemoteSpecialPurposeSubsidiaryPrimaryBeneficiaryMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 4 USD true false false false Qualifying Facility 1 [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_VariableInterestEntityVIEOrPotentialVIEInformationUnavailabilityMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 5 USD true false false false Qualifying Facility 1 [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_VariableInterestEntityVIEOrPotentialVIEInformationUnavailabilityMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Qualifying Facility 1 [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_VariableInterestEntityVIEOrPotentialVIEInformationUnavailabilityMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Qualifying Facility 1 [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_VariableInterestEntityVIEOrPotentialVIEInformationUnavailabilityMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 true false false false Variable Interest Entity Qualifying Facility Not Primary Beneficiary [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntityQualifyingFacilityNotPrimaryBeneficiaryMember dei_LegalEntityAxis explicitMember false 9 true false false false Variable Interest Entities Of Next Era Energy Resources [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntitiesOfNextEraEnergyResourcesMember dei_LegalEntityAxis explicitMember u001 Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 10 USD true false false false Variable Interest Entities Gas And Oil Of Next Era Energy Resources Primary Beneficiary [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntitiesGasAndOilOfNextEraEnergyResourcesPrimaryBeneficiaryMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Variable Interest Entity Wind Of Next Era Energy Resources Primary Beneficiary [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntityWindOfNextEraEnergyResourcesPrimaryBeneficiaryMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false Variable Interest Entity Other [Member] dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi nee_VariableInterestEntityOtherMember dei_LegalEntityAxis explicitMember u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 Storm-recovery bonds aggregate principal amount issued 3 nee_SeniorSecuredDebtAggregatePrincipalAmountIssued nee false credit instant Aggregate principal amount of senior secured bonds (storm-recovery bonds) issued by the VIE. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 true true false false 652000000 652 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Aggregate principal amount of senior secured bonds (storm-recovery bonds) issued by the VIE. No authoritative reference available. false 6 Storm and property insurance reserve 3 nee_StormAndPropertyInsuranceReserve nee false credit instant Portion of proceeds from issuance of senior secured bonds used to reestablish storm and property insurance reserve. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false true false false 200000000 200 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Portion of proceeds from issuance of senior secured bonds used to reestablish storm and property insurance reserve. No authoritative reference available. false 7 Proceeds from issuance of storm-recovery bonds 3 nee_ProceedsFromIssuanceOfSecuredSeniorLongTermDebt nee false debit instant Net proceeds, after debt issuance costs, to the VIE. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false true false false 644000000 644 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Net proceeds, after debt issuance costs, to the VIE. No authoritative reference available. false 8 Carrying amount of assets, consolidated variable interest entity 3 us-gaap_VariableInterestEntityCarryingAmountOfCollateralizedAssets us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 459000000 459 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 309000000 309 true false false 11 false true false false 1200000000 1200 true false false 12 false true false false 50000000 50 true false false xbrli:monetaryItemType monetary The carrying amount of the variable interest entity's assets consolidated into the statement of financial position. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 26 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph 9 -Subparagraph c(5), c(6) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C5 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph b Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 24 -Subparagraph b Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C8 -Subparagraph b false 9 Carrying amount of liabilities, consolidated variable interest entity 3 us-gaap_VariableInterestEntityCarryingAmountOfLiabilitiesConsolidatedVIE us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false true false false 562000000 562 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false true false false 226000000 226 true false false 11 false true false false 1200000000 1200 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary The carrying amount of the variable interest entity's liabilities consolidated into the statement of financial position. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C8 -Subparagraph b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 24 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 23 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C6 -Subparagraph a Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph 9 -Subparagraph c(5), c(6) Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 26 -Subparagraph b Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4 and FIN46(R)-8 -Paragraph C5 -Subparagraph a false 10 Coal fired generating facility capacity 3 nee_CoalFiredGeneratingFacilityCapacity nee false na duration Capacity of coal-fired qualifying facility false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 250 megawatt 250 megawatt true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 330 mw 330 mw true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Capacity of coal-fired qualifying facility No authoritative reference available. false 11 Quantity of electricity purchased 3 nee_QuantityOfElectricityPurchased nee false na duration Quantity of electricity output purchased from the qualifying facility under the PPA agreement. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 373,152 mwh 373,152 mwh true false false 5 false false false false 0 0 335,064 mwh 335,064 mwh true false false 6 false false false false 0 0 735,542 mwh 735,542 mwh true false false 7 false false false false 0 0 808,829 mwh 808,829 mwh true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Quantity of electricity output purchased from the qualifying facility under the PPA agreement. No authoritative reference available. false 12 Cost of electricity purchased 3 nee_CostOfElectricityPurchased nee false debit duration Total cost of electricity output purchased from the qualifying facility under the PPA agreement. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false true false false 46000000 46 true false false 5 false true false false 41000000 41 true false false 6 false true false false 91000000 91 true false false 7 false true false false 83000000 83 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:monetaryItemType monetary Total cost of electricity output purchased from the qualifying facility under the PPA agreement. No authoritative reference available. false 13 Ownership percentage 3 us-gaap_VariableInterestEntityOwnershipPercentage us-gaap true na duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false true false false 100 100 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false us-types:percentItemType pure Percentage of the VIE's voting interest owned by the registrant. In general, a VIE is a corporation, partnership, trust, or any other legal structure used for business purposes that either (a) does not have equity investors with voting rights or (b) has equity investors that do not provide sufficient financial resources for the entity to support its activities. A VIE often holds financial assets, including loans or receivables, real estate or other property. A VIE may be essentially passive or it may engage in research and development or other activities on behalf of another company. No authoritative reference available. false 14 Natural gas and or oil electric generating facility capacity 3 nee_NaturalGasAndOrOilElectricGeneratingFacilityCapacity nee false na duration Total capability of natural gas and/or oil electric generating facilities. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 778 mw 778 mw true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Total capability of natural gas and/or oil electric generating facilities. No authoritative reference available. false 15 Wind electric generating facility capability 3 nee_WindElectricGeneratingFacilityCapability nee false na duration Total capability of wind electric generating facilities. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 768 mw 768 mw true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Total capability of wind electric generating facilities. No authoritative reference available. false 16 Length of transmission line 3 nee_LengthOfTransmissionLine nee false na instant Length of transmission line owned and operated by an entity that is consolidated by the consolidated VIE. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 78 mile true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Length of transmission line owned and operated by an entity that is consolidated by the consolidated VIE. No authoritative reference available. false 17 Capacity of transmission line 3 nee_CapacityOfTransmissionLine nee false na instant Capacity of transmission line owned and operated by an entity that is consolidated by the consolidated VIE. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 230 kilovolt true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Capacity of transmission line owned and operated by an entity that is consolidated by the consolidated VIE. No authoritative reference available. false 18 Investments in special purpose entities 3 nee_InvestmentsInUnconsolidatedSpecialPurposeEntities nee false debit instant Unconsolidated investments in certain special purpose entities, including but not limited to, investments in mortgage-backed... false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 true true false false 629000000 629 true false false xbrli:monetaryItemType monetary Unconsolidated investments in certain special purpose entities, including but not limited to, investments in mortgage-backed securities, asset-backed securities and collateralized mortgage and debt obligations. No authoritative reference available. false 19 Total number of consolidated variable interest entities 1 nee_TotalNumberOfConsolidatedVariableInterestEntities nee false na instant Total number of consolidated variable interest entities. false false false false false false false false false false false false 1 false false false false 0 0 six six false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false xbrli:stringItemType string Total number of consolidated variable interest entities. No authoritative reference available. false 12 15 false Millions UnKnown UnKnown false true