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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]          
Due from related parties $ 89   $ 89   $ 17
Revenue from related parties 2 $ 2 13 $ 5  
Transportation and Fuel Management Agreement [Member]          
Related Party Transaction [Line Items]          
Revenue from related parties 2 2 12 5  
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]          
Related Party Transaction [Line Items]          
Expenses from transactions with related party (29) (24) (82) (68)  
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]          
Related Party Transaction [Line Items]          
Interest expense (1) $ (1) (4) $ (4)  
Due from related parties 82   $ 82   $ 12
NEP OpCo [Member] | NextEra Energy, Inc. [Member] | Management Services Agreement [Member]          
Related Party Transaction [Line Items]          
Management fee, percent of EBITDA     1.00%    
Annual management fee     $ 4    
Related Party Transaction, Additional Management Fee, Threshold, Prior Year EBITDA     4    
NEER [Member] | Guarantees [Member]          
Related Party Transaction [Line Items]          
Related party obligations 11   11    
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]          
Related Party Transaction [Line Items]          
Total amount of letters of credit $ 636   $ 636