Summary of Significant Accounting Policies (PPE) (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Sep. 30, 2022	Aug. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Impairment and other expense			$ 1	$ 54	$ 71
SCE
Property, Plant and Equipment [Line Items]
Depreciation			$ 2,500	$ 2,500	$ 2,000
Depreciation expense based on cost (as a percent)			4.10%	4.20%	3.70%
AFUDC equity capitalized during construction			$ 157	$ 137	$ 118
Impairment and other expense	$ 47	$ 79	1	50	67
Asset impairment, net of tax	$ 34	$ 47
SCE | Other income.
Property, Plant and Equipment [Line Items]
AFUDC equity capitalized during construction			157	137	118
SCE | Interest expense
Property, Plant and Equipment [Line Items]
AFUDC debt capitalized during construction			$ 74	$ 53	$ 50
SCE | Generation plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			10 years
SCE | Generation plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			54 years
SCE | Generation plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			39 years
SCE | Distribution plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			20 years
SCE | Distribution plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			67 years
SCE | Distribution plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			50 years
SCE | Transmission plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			30 years
SCE | Transmission plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			65 years
SCE | Transmission plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			54 years
SCE | General plant and other | Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			5 years
SCE | General plant and other | Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			60 years
SCE | General plant and other | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated Useful Lives			20 years