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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]          
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%  
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (43.00%) (19.00%) (35.00%) (29.00%)  
State income tax, net of federal income tax benefit (3.00%) 1.00% (6.00%) (6.00%)  
Income tax effect of foreign income (1.00%) (0.00%) (2.00%) (3.00%)  
Effects of ratemaking (9.00%) (2.00%) (5.00%) (3.00%)  
Equity income 0.00% 0.00% 0.00% 0.00%  
Other, net (1.00%) 1.00% (0.00%) 1.00%  
Effective income tax rate (36.00%) 2.00% (27.00%) (19.00%)  
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 $ (457)   $ (457)   $ (457)
Parent Company [Member]          
Related Party Tax Expense [Abstract]          
Related party transaction, cash received for income taxes, net     $ 534 $ 450