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Income Taxes - NPC (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Schedule of Effective Income Tax Rate Reconciliation [Line Items]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Effects of ratemaking (3.00%) (3.00%) (4.00%) (3.00%)
Income tax credits (50.00%) (34.00%) (67.00%) (35.00%)
Other 1.00% 0.00% (1.00%) 0.00%
Effective income tax rate (38.00%) (24.00%) (58.00%) (21.00%)
Related party transaction, cash received (paid) for income taxes     $ 851 $ 864
NPC        
Schedule of Effective Income Tax Rate Reconciliation [Line Items]        
Federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%
Effects of ratemaking (5.00%) (11.00%) (4.00%) (10.00%)
Income tax credits (4.00%) 0.00% (5.00%) 0.00%
Other 1.00% 0.00% 1.00% (1.00%)
Effective income tax rate 13.00% 10.00% 13.00% 10.00%
Related party transaction, cash received (paid) for income taxes     $ (93) $ 0