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Income Taxes - NPC (Details) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule of Effective Income Tax Rate Reconciliation [Line Items]    
Federal statutory income tax rate 21.00% 21.00%
Effects of ratemaking (7.00%) (3.00%)
Income tax credits (108.00%) (35.00%)
Effective income tax rate (104.00%) (17.00%)
Related party transaction, cash received (paid) for income taxes $ 0 $ 0
NPC    
Schedule of Effective Income Tax Rate Reconciliation [Line Items]    
Federal statutory income tax rate 21.00% 21.00%
Effects of ratemaking (1.00%) (9.00%)
Income tax credits (8.00%) (2.00%)
Other 5.00% 10.00%
Effective income tax rate 17.00% 20.00%
Related party transaction, cash received (paid) for income taxes $ (33,000,000) $ 0