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Jointly-Owned Electric Plants (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
FPL [Member] | Jointly Owned Nuclear Power Plant 1 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name St. Lucie Unit No. 2
Ownership Interest (in hundredths) 85.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant1Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Gross Investment $ 2,112us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant1Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Accumulated Depreciation 752us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant1Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Construction Work in Progress 21us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant1Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
FPL [Member] | Jointly Owned Nuclear Power Plant 2 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name St. Johns River Power Park units and coal terminal
Ownership Interest (in hundredths) 20.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant2Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Gross Investment 399us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant2Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Accumulated Depreciation 201us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant2Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Construction Work in Progress 1us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant2Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
FPL [Member] | Jointly Owned Nuclear Power Plant 3 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name Scherer Unit No. 4
Ownership Interest (in hundredths) 76.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant3Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
Gross Investment 1,105us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant3Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Accumulated Depreciation 352us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant3Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember		 [1]
Construction Work in Progress 14us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedNuclearPowerPlant3Member
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
NEER [Member] | Jointly Owned Electricity Generation Plant 1 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name Duane Arnold
Ownership Interest (in hundredths) 70.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant1Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
Gross Investment 449us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant1Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Accumulated Depreciation 120us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant1Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Construction Work in Progress 22us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant1Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
NEER [Member] | Jointly Owned Electricity Generation Plant 2 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name Seabrook
Ownership Interest (in hundredths) 88.23%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant2Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
Gross Investment 1,010us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant2Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Accumulated Depreciation 212us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant2Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Construction Work in Progress 90us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant2Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
NEER [Member] | Jointly Owned Electricity Generation Plant 3 [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name Wyman Station Unit No. 4
Ownership Interest (in hundredths) 84.35%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant3Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
Gross Investment 24us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant3Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Accumulated Depreciation 1us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant3Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember		 [1]
Construction Work in Progress 1us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= nee_JointlyOwnedElectricityGenerationPlant3Member
/ dei_LegalEntityAxis
= nee_NexteraEnergyResourcesMember
Corporate and Other [Member] | Jointly Owned Electricity Transmission and Distribution System [Member]  
Proportionate ownership interest In jointly-owned facilities [Abstract]  
Facility Name Transmission substation assets located in Seabrook, New Hampshire
Ownership Interest (in hundredths) 88.23%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMember
/ dei_LegalEntityAxis
= us-gaap_CorporateAndOtherMember
Gross Investment 72us-gaap_JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMember
/ dei_LegalEntityAxis
= us-gaap_CorporateAndOtherMember		 [1]
Accumulated Depreciation 17us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMember
/ dei_LegalEntityAxis
= us-gaap_CorporateAndOtherMember		 [1]
Construction Work in Progress $ 2us-gaap_JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedElectricityTransmissionAndDistributionSystemMember
/ dei_LegalEntityAxis
= us-gaap_CorporateAndOtherMember
[1] Excludes nuclear fuel.