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NEP (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Investments [Line Items]          
Investment in equity method investees $ 6,957   $ 6,957   $ 7,453
Guarantor obligations, current carrying value 650   650    
Debt instrument, fair value disclosure 31   31    
Cash Sweep And Credit Support Agreement [Member] | NEER [Member]          
Schedule of Investments [Line Items]          
Fee income 29 $ 24 57 $ 48  
Due from related parties, current 73   73   53
Due from related parties, noncurrent 35   35   33
Cash Sweep And Credit Support Agreement [Member] | NEER [Member] | NextEra Energy Partners [Member]          
Schedule of Investments [Line Items]          
Due to related parties $ 58   $ 58   $ 12