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Income Taxes - NPC - Reconciliation of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Contingency [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
Effects of ratemaking (6.00%) (11.00%) (16.00%)
Income tax credits (59.00%) (85.00%) (124.00%)
Other, net 0.00% 0.00% 2.00%
Effective income tax rate (50.00%) (87.00%) (136.00%)
NPC      
Income Tax Contingency [Line Items]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
Effects of ratemaking (4.00%) (13.00%) (11.00%)
Income tax credits (3.00%) 0.00% 0.00%
Other, net 0.00% 0.00% 1.00%
Effective income tax rate 14.00% 8.00% 11.00%