Supplementary Financial Information - Summary of Inventories by Major Category and Other Investments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Inventories by Major Category
Materials and supplies	$ 533	$ 289
Fuel stock	403	420
Natural gas in storage	34	31
Total inventories	970	740
Other Investments
Nuclear decommissioning trusts	4,440	1,951
Assets related to employee benefit plans	14	28
Land investments	42	42
Other investments	16	14
Total investments	$ 4,512	$ 2,035