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Investments in Partnerships and Joint Ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity method investment, financial statement, reported amounts [Abstract]      
Ownership interest in partnerships and joint ventures $ 6,748 $ 2,321  
NextEra Energy Resources' ownership interest, low range (in hundredths) 31.00%    
NextEra Energy Resources' ownership interest, high range (in hundredths) 64.00%    
Equity method investment, summarized financial information [Abstract]      
Net income $ 632 358  
Total assets 16,334 6,001  
Total liabilities 5,990 1,217  
Partners'/members' equity(a) 10,344 4,784  
Investment in equity method investees 6,748 2,321 [1] $ 1,767
Interest and Fee Income, Other Loans 94    
Due from Related Parties, Current 45    
Due from Related Parties, Noncurrent 34    
Guarantor Obligations, Current Carrying Value 775    
Guarantees, Fair Value Disclosure 33    
NEER [Member]      
Equity method investment, summarized financial information [Abstract]      
NEER's share of underlying equity in the principal entities 2,958 2,024  
Difference between investment carrying amount and underlying equity in net assets 3,193 105  
Investment in equity method investees $ 6,151 $ 2,129  
Difference related to goodwill 70.00%    
NEP [Member]      
Equity method investment, summarized financial information [Abstract]      
Due to Related Parties $ 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 22 years    
Maximum [Member] | NEER [Member]      
Equity method investment, summarized financial information [Abstract]      
Amortization period 31 years    
[1] Amounts have been retrospectively adjusted as discussed in Note 14.