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Variable Interest Entities (VIEs) (Details)
$ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2018
USD ($)
Jun. 30, 2019
USD ($)
variable_interest_entity
entity
mi
MW
Dec. 31, 2007
USD ($)
Dec. 31, 2018
USD ($)
entity
Variable Interest Entity [Line Items]        
Total number of consolidated variable interest entities | variable_interest_entity   29    
Net cash proceeds $ 71      
Gain on sale 50      
Gain on sale, after tax $ 37      
Investment in equity method investees   $ 7,202   $ 6,748
Variable Interest Entities Gas And Oil Primary Beneficiary 2 [Member] [Domain]        
Variable Interest Entity [Line Items]        
Number of entities with ownership interest contributed | entity       2
Other variable interest entities [Member]        
Variable Interest Entity [Line Items]        
Investments in special purpose entities   2,965   $ 2,668
Variable Interest Entity, Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Carrying amount of assets, consolidated variable interest entity   103    
Carrying amount of liabilities, consolidated variable interest entity   $ 18    
Electricity transmission line (mi) | mi   275    
Percentage of profits and losses   50.00%    
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   $ 34   77
Carrying amount of liabilities, consolidated variable interest entity   36   76
FPL [Member] | Other variable interest entities [Member]        
Variable Interest Entity [Line Items]        
Investments in special purpose entities   $ 2,466   $ 2,203
NextEra Energy Resources [Member]        
Variable Interest Entity [Line Items]        
Total number of consolidated variable interest entities | variable_interest_entity   27    
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary [Member]        
Variable Interest Entity [Line Items]        
Total number of consolidated variable interest entities   2   3
Carrying amount of assets, consolidated variable interest entity   $ 211   $ 257
Carrying amount of liabilities, consolidated variable interest entity   $ 21   $ 21
Natural gas and or oil electric generating facility capacity (in megawatts) | MW   1,450    
NextEra Energy Resources [Member] | Variable Interest Entities Gas And Oil Primary Beneficiary 2 [Member] [Domain]        
Variable Interest Entity [Line Items]        
Number of entities with ownership interest contributed | entity   2   2
NextEra Energy Resources [Member] | Variable Interest Entities Wind and Solar Primary Beneficiary [Member] [Member]        
Variable Interest Entity [Line Items]        
Total number of consolidated variable interest entities | variable_interest_entity   22    
Carrying amount of assets, consolidated variable interest entity   $ 9,100   $ 10,200
Carrying amount of liabilities, consolidated variable interest entity   $ 700   $ 1,400
Number of entities with ownership interest contributed | entity       25
Solar generating facility capability (in MW) | MW   473    
Wind electric generating facility capability (in megawatts) | MW   6,319    
Indirect Subsidiary of NextEra Energy Resources [Member] | Photovoltaic Solar Facility [Member]        
Variable Interest Entity [Line Items]        
Total number of consolidated variable interest entities | variable_interest_entity   3    
Carrying amount of assets, consolidated variable interest entity   $ 806   $ 529
Carrying amount of liabilities, consolidated variable interest entity   $ 613   557
Ownership percentage   50.00%    
Number of entities with ownership interest contributed | variable_interest_entity   5    
Solar generating facility capability (in MW) | MW   409    
Other Investments [Member] | Subsidiaries of NEE [Member]        
Variable Interest Entity [Line Items]        
Investment in equity method investees   $ 4,385   $ 4,680
Number of entities committed to invest in | entity   4    
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