Government Assistance (Details) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) MW	Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2025 USD ($) MW	Jan. 16, 2025 MW	Oct. 31, 2024 USD ($)
Property, Plant and Equipment [Line Items]
Operating revenues			$ 17,224	$ 14,779	$ 13,728
Investment tax credit sold under agreements, carrying amount								$ 156
Production tax credit sold under agreements								$ 10
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III
Property, Plant and Equipment [Line Items]
Battery energy storage system capacity | MW		350
Investment tax credit		$ 154
Additional investment tax credit	$ 2
Investment tax credit sold under agreements, carrying amount	$ 156
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III | Subsequent Event
Property, Plant and Equipment [Line Items]
Battery energy storage system capacity | MW						300	300
Baldwin Facility
Property, Plant and Equipment [Line Items]
Battery energy storage system capacity | MW		2
Investment tax credit			$ 57
Solar energy storage system capacity | MW			68
Coffeen Facility
Property, Plant and Equipment [Line Items]
Battery energy storage system capacity | MW		2
Investment tax credit			$ 45
Solar energy storage system capacity | MW			44
Transferable Nuclear Production Tax Credit Revenues
Property, Plant and Equipment [Line Items]
Operating revenues			$ 545
Transferable Nuclear Production Tax Credit Revenues | Subsequent Event
Property, Plant and Equipment [Line Items]
Production tax credit sold under agreements						$ 200
Transferable Solar Production Tax Credit Revenues
Property, Plant and Equipment [Line Items]
Operating revenues			$ 11