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Income Taxes - PAC (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
State income tax, net of federal income tax impacts (3.00%) 21.00%
Income tax credits 72.00% 136.00%
Effects of ratemaking 8.00% 10.00%
Other (1.00%) (1.00%)
Effective income tax rate 108.00% 217.00%
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 338 $ 315
PAC    
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 21.00% 21.00%
State income tax, net of federal income tax impacts 3.00% 3.00%
Income tax credits (20.00%) (20.00%)
Effects of ratemaking (11.00%) (13.00%)
Valuation allowance 6.00% 0.00%
Other 3.00% 2.00%
Effective income tax rate 2.00% (7.00%)
Years eligible for federal renewable energy production tax credit 10 years  
Production tax credits $ 26 $ 31