Income Taxes - NPC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of Income Tax Expense (Benefit) [Line Items]
Years eligible for renewable energy production tax credit	10 years
Production tax credits	$ 1,900	$ 1,700	$ 1,700
NPC
Components of Income Tax Expense (Benefit) [Line Items]
Years eligible for renewable energy production tax credit	10 years
Investment tax credit, maximum percentage	50.00%
Production tax credits	$ 8	0	0
Investment tax credits	$ 7	$ 0	$ 0