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Investments in Partnerships and Joint Ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity method investment, financial statement, reported amounts [Abstract]      
Ownership interest in partnerships and joint ventures $ 7,453 $ 6,748  
NextEra Energy Resources' ownership interest, low range (in hundredths) 31.00%    
NextEra Energy Resources' ownership interest, high range (in hundredths) 61.00%    
Equity method investment, summarized financial information [Abstract]      
Net income $ 128 632  
Total assets 20,659 16,334  
Total liabilities 6,956 5,990  
Partners'/members' equity(a) 13,703 10,344  
Investment in equity method investees 7,453 6,748 $ 2,321
Interest and Fee Income, Other Loans 101 94  
Due from Related Parties, Current 53 45  
Due from Related Parties, Noncurrent 33 34  
Guarantor Obligations, Current Carrying Value 669    
Guarantees, Fair Value Disclosure 31    
NEER [Member]      
Equity method investment, summarized financial information [Abstract]      
NEE's share of underlying equity in the principal entities 3,723 2,958  
Difference between investment carrying amount and underlying equity in net assets 3,153 3,193  
Investment in equity method investees $ 6,876 6,151  
Difference related to goodwill 70.00%    
NEP [Member]      
Equity method investment, summarized financial information [Abstract]      
Due to Related Parties $ 12 66  
NEP [Member]      
Equity method investment, summarized financial information [Abstract]      
Investment in equity method investees   $ 4,400  
Minimum [Member] | NEER [Member]      
Equity method investment, summarized financial information [Abstract]      
Amortization period 20 years    
Maximum [Member] | NEER [Member]      
Equity method investment, summarized financial information [Abstract]      
Amortization period 28 years