Income Taxes - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) MW	Dec. 31, 2024 USD ($) MW	Dec. 31, 2023 USD ($) MW	Dec. 31, 2022 USD ($)
Income Tax Disclosure [Line Items]
Deferred tax expense		$ 9	$ 108	$ (177)
Investment tax credit	$ 231
Unrecognized tax benefits that would impact the effective tax rate		72
SCE
Income Tax Disclosure [Line Items]
Deferred tax expense		69	$ 179	$ (111)
Unrecognized tax benefits that would impact the effective tax rate		$ 66
SCE | SCE Power Purchases Contracts
Income Tax Disclosure [Line Items]
Power generating capacity of projects owned controlled | MW	200	5,200	3,343
SCE | SCE Power Purchases Contracts
Income Tax Disclosure [Line Items]
Power generating capacity of projects owned controlled | MW	112.5
Capistrano Wind
Income Tax Disclosure [Line Items]
Deferred tax expense		$ 107	$ 106