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Variable Interest Entities (VIEs) (Details)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
variable_interest_entity
entity
mi
MW
Feb. 28, 2018
USD ($)
Sep. 30, 2019
USD ($)
variable_interest_entity
entity
mi
MW
Dec. 31, 2007
USD ($)
Dec. 31, 2018
USD ($)
variable_interest_entity
entity
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity 30   30    
Net cash proceeds   $ 71      
Gain on sale   50      
Gain on sale, after tax   $ 37      
Investment in equity method investees $ 7,180   $ 7,180   $ 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         $ 2,668
Variable Interest Entity, Primary Beneficiary [Member]          
Variable Interest Entity [Line Items]          
Carrying amount of assets, consolidated variable interest entity 149   149    
Carrying amount of liabilities, consolidated variable interest entity $ 27   $ 27    
Electricity transmission line (mi) | mi 275   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         77
Carrying amount of liabilities, consolidated variable interest entity         76
FPL [Member] | Other variable interest entities [Member]          
Variable Interest Entity [Line Items]          
Investments in special purpose entities $ 2,476   $ 2,476   $ 2,203
NextEra Energy Resources [Member]          
Variable Interest Entity [Line Items]          
Total number of consolidated variable interest entities | variable_interest_entity 28   28    
Wind electric generating facility capability (in megawatts) | MW 220        
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   2   3
Carrying amount of assets, consolidated variable interest entity $ 212   $ 212   $ 257
Carrying amount of liabilities, consolidated variable interest entity $ 22   $ 22   $ 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   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 23   23   25
Carrying amount of assets, consolidated variable interest entity $ 9,400   $ 9,400   $ 10,200
Carrying amount of liabilities, consolidated variable interest entity $ 800   $ 800   1,400
Solar generating facility capability (in MW) | MW     473    
Wind electric generating facility capability (in megawatts) | MW     6,452    
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   3    
Carrying amount of assets, consolidated variable interest entity $ 793   $ 793   529
Carrying amount of liabilities, consolidated variable interest entity $ 616   $ 616   557
Ownership percentage     50.00%    
Number of entities with ownership interest contributed | variable_interest_entity 5   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 $ 4,194   $ 4,194   $ 4,680
Number of entities committed to invest in | entity 4   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