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Income Taxes - PAC - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of Income Tax Expense (Benefit) [Line Items]      
Effective income tax rate (87.00%) (136.00%) (21.00%)
Income tax expense (benefit) $ (1,699) $ (1,916) $ (1,132)
Loss before income tax benefit and equity income 1,961 1,413 5,294
Wildfire losses, net of recoveries $ 1,677 $ 64 $ 0
Federal statutory income tax rate 21.00% 21.00% 21.00%
Income tax credits (85.00%) (124.00%) (27.00%)
Effects of ratemaking (11.00%) (16.00%) (4.00%)
State income tax, net of federal income tax benefit (6.00%) (6.00%) (10.00%)
Years eligible for renewable energy production tax credit 10 years    
Production tax credits $ 1,700 $ 1,700 $ 1,400
PAC      
Components of Income Tax Expense (Benefit) [Line Items]      
Effective income tax rate 54.00% (7.00%) (10.00%)
Income tax expense (benefit) $ (553) $ (62) $ (79)
Loss before income tax benefit and equity income (1,021) 858 809
Wildfire losses, net of recoveries 1,677 $ 64 $ 0
Federal statutory income tax rate, benefit $ 214    
Federal statutory income tax rate 21.00% 21.00% 21.00%
Income tax credit benefit $ 180    
Income tax credits 18.00% (22.00%) (20.00%)
Effects of ratemaking, benefit $ 111    
Effects of ratemaking 11.00% (12.00%) (14.00%)
State income tax, net of federal income tax impacts, benefit $ 41    
State income tax, net of federal income tax benefit 4.00% 3.00% 3.00%
Years eligible for renewable energy production tax credit 10 years    
Production tax credits $ 180 $ 185 $ 164