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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Federal statutory income tax rate 21.00% 21.00%  
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (46.00%) (29.00%)  
State income tax, net of federal income tax benefit (0.00%) (17.00%)  
Income tax effect of foreign income (3.00%) (3.00%)  
Effects of ratemaking (8.00%) (3.00%)  
Equity income (1.00%) (1.00%)  
Other, net 1.00% 2.00%  
Effective income tax rate (36.00%) (30.00%)  
Production Tax Credit Carryforwards [Abstract]      
Years eligible for federal renewable energy production tax credit 10 years    
Related Party Tax Expense [Abstract]      
Long-term income tax receivable $ (530)   $ (530)
Parent Company [Member]      
Related Party Tax Expense [Abstract]      
Related party transaction, cash received for income taxes, net $ 100 $ 0