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Income Taxes - PAC (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
State income tax, net of federal income tax impacts (1.00%) 4.00% 0.00% 2.00%
Income tax credits (13.00%) (13.00%) (28.00%) (27.00%)
Effects of ratemaking (1.00%) (2.00%) (2.00%) (4.00%)
Other 1.00% 0.00% 0.00% 1.00%
Effective income tax rate 5.00% 12.00% (13.00%) (8.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits     $ 734 $ 678
PAC        
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
State income tax, net of federal income tax impacts 4.00% 4.00% 3.00% 4.00%
Income tax credits (25.00%) (19.00%) (21.00%) (19.00%)
Effects of ratemaking (13.00%) (15.00%) (11.00%) (14.00%)
Valuation allowance 0.00% 0.00% 4.00% 0.00%
Other 2.00% 0.00% 1.00% 0.00%
Effective income tax rate (11.00%) (9.00%) (3.00%) (8.00%)
Years eligible for federal renewable energy production tax credit     10 years  
Production tax credits $ 18 $ 40 $ 44 $ 71
Related party transaction, cash received (paid) for income taxes     $ 150 $ 93