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Income Taxes - PAC - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
State income tax, net of federal income tax benefit (6.00%) (6.00%) (10.00%)
Effects of ratemaking (11.00%) (16.00%) (4.00%)
Income tax credits (85.00%) (124.00%) (27.00%)
Other, net 0.00% 2.00% 1.00%
Effective income tax rate (87.00%) (136.00%) (21.00%)
PAC      
Schedule of Effective Income Tax Rate Reconciliation [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
State income tax, net of federal income tax benefit 4.00% 3.00% 3.00%
Effects of ratemaking 11.00% (12.00%) (14.00%)
Income tax credits 18.00% (22.00%) (20.00%)
Valuation allowances 1.00% 2.00% 0.00%
Other, net (1.00%) 1.00% 0.00%
Effective income tax rate 54.00% (7.00%) (10.00%)