Government Assistance (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	May 31, 2025	Jan. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Government Assistance [Line Items]
Total revenues					$ 4,971	$ 6,288	$ 13,154	$ 13,187
Transferable Nuclear Production Tax Credit Revenues
Government Assistance [Line Items]
Total revenues					145		145
PTC sold under agreements	$ 200	$ 90	$ 90	$ 200			490
PTC sold under agreements, cash proceeds					$ 278		$ 469