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Variable Interest Entities (VIEs) (Details)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Jun. 30, 2018
USD ($)
variable_interest_entity
entities
MW
Jun. 30, 2017
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2017
USD ($)
variable_interest_entity
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities   27      
Proceeds from sale of special purpose entity $ 71        
Variable interest entity, gain (loss) on sale of investment, before tax 50        
Variable interest entity, gain (loss) on sale of investment, after tax $ 37        
Investment in equity method investees   $ 6,217     $ 2,321
NEP OpCo [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity         1
Carrying amount of assets, consolidated variable interest entity         $ 8,400
Carrying amount of liabilities, consolidated variable interest entity         6,200
Other variable interest entities [Member]          
Variable Interest Entity [Line Items]          
Investments in special purpose entities   2,717     2,634
FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]          
Variable Interest Entity [Line Items]          
Senior Secured Debt Aggregate Principal Amount Issued       $ 652  
Carrying amount of assets, consolidated variable interest entity   106     148
Carrying amount of liabilities, consolidated variable interest entity   110     147
FPL [Member] | Other variable interest entities [Member]          
Variable Interest Entity [Line Items]          
Investments in special purpose entities   $ 2,246     2,195
NextEra Energy Resources [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | entities   26      
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member]          
Variable Interest Entity [Line Items]          
Carrying amount of assets, consolidated variable interest entity   $ 74     89
Carrying amount of liabilities, consolidated variable interest entity   $ 23     29
Natural gas and or oil electric generating facility capacity (in megawatts) | MW   110      
NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity   2      
Number of entities with ownership interest contributed | entities   3      
Solar generating facility capability (in MW) | MW   277      
Wind electric generating facility capability (in megawatts) | MW   374      
NextEra Energy Resources [Member] | Special Purpose Entity that has Insufficient Equity at Risk [Member]          
Variable Interest Entity [Line Items]          
Carrying amount of assets, consolidated variable interest entity         490
Carrying amount of liabilities, consolidated variable interest entity         502
NextEra Energy Resources [Member] | Wind variable interest entities [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity   23      
Carrying amount of assets, consolidated variable interest entity   $ 9,500     13,100
Carrying amount of liabilities, consolidated variable interest entity   $ 1,100     6,900
Wind electric generating facility capability (in megawatts) | MW   6,035      
NextEra Energy Resources [Member] | Gas and or Oil Variable Interest Entities [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity   1      
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]          
Variable Interest Entity [Line Items]          
Carrying amount of assets, consolidated variable interest entity   $ 550     548
Carrying amount of liabilities, consolidated variable interest entity   $ 569     594
Ownership percentage   50.00%      
Subsidiaries of NEE [Member]          
Variable Interest Entity [Line Items]          
Additional commitments to invest   $ 65 $ 75    
Additional VIEs committed to invest in | variable_interest_entity   3      
Other Investments [Member]          
Variable Interest Entity [Line Items]          
Investment in equity method investees   $ 4,733     $ 248
Senior Secured Debt [Member] | FPL [Member] | Bankruptcy remote special purpose subsidiary [Member]          
Variable Interest Entity [Line Items]          
Proceeds from issuance of storm-recovery bonds       $ 644  
NEP OpCo [Member]          
Variable Interest Entity [Line Items]          
Ownership percentage         65.10%