Debt and Credit Agreements (Credit Facilities) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Commitment	$ 4,850
Outstanding borrowings	285
Outstanding letters of credit	431
Amount available	$ 4,134
Edison International Parent and Other
Line of Credit Facility [Line Items]
Covenant debt to total capitalization ratio	0.70
Actual debt to capitalization ratio	0.64
Edison International Parent and Other | Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment	$ 1,500
Outstanding borrowings	90
Amount available	1,410
Contingent maximum available borrowing	$ 2,000
Edison International Parent and Other | Multi-year credit facilities | SOFR
Line of Credit Facility [Line Items]
Basis points	1.28%
Edison International Parent and Other | Multi-year credit facilities | Commercial paper
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 90	$ 0
Weighted average interest rate (as a percent)	4.92%
SCE
Line of Credit Facility [Line Items]
Covenant debt to total capitalization ratio	0.65
Actual debt to capitalization ratio	0.56
SCE | Multi-year credit facilities
Line of Credit Facility [Line Items]
Commitment	$ 3,350
Outstanding borrowings	195
Outstanding letters of credit	431
Amount available	2,724
Contingent maximum available borrowing	$ 4,000
SCE | Multi-year credit facilities | SOFR
Line of Credit Facility [Line Items]
Basis points	1.08%
SCE | Multi-year credit facilities | Commercial paper
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 195	$ 601
Weighted average interest rate (as a percent)	5.20%	0.45%
SCE | Other long-term debt | SOFR
Line of Credit Facility [Line Items]
Basis points	0.90%