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Income Taxes - PAC (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
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 0.00% (4.00%)  
Income tax credits (108.00%) (35.00%)  
Effects of ratemaking (7.00%) (3.00%)  
Effective income tax rate (104.00%) (17.00%)  
Income tax expense (benefit) $ (371,000,000) $ (162,000,000)  
Income (loss) before income tax expense (benefit) and equity income (loss) 357,000,000 979,000,000  
Wildfire losses, net of recoveries $ 0 359,000,000  
Years eligible for federal renewable energy production tax credit 10 years    
Related party transaction, cash received (paid) for income taxes $ 0 $ 0  
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% 4.00%  
Income tax credits (22.00%) 13.00%  
Effects of ratemaking (11.00%) 6.00%  
Valuation allowance 0.00% 5.00%  
Other 1.00% (1.00%)  
Effective income tax rate (8.00%) 48.00%  
Income tax expense (benefit) $ (9,000,000) $ (110,000,000)  
Income (loss) before income tax expense (benefit) and equity income (loss) 112,000,000 (230,000,000)  
Wildfire losses, net of recoveries 0 359,000,000  
Federal statutory income tax rate, benefit   48,000,000  
Income tax credit benefit $ 25,000,000 $ 29,000,000  
Years eligible for federal renewable energy production tax credit 10 years    
Related party transaction, cash received (paid) for income taxes $ 189,000,000    
Income taxes payable $ 79,000,000    
Income taxes receivable     $ 114,000,000