Debt and Credit Agreements (Credit Facilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	May 31, 2024
Line of Credit Facility
Commitment	$ 4,850
Outstanding borrowings	1,705
Outstanding letters of credit	6
Amount available	$ 3,139
Multi-year credit facilities | Edison International Parent and Other:
Line of Credit Facility
Variable rate on debt (as a percent)	1.28%
Commitment	$ 1,500
Outstanding borrowings	445
Outstanding letters of credit	0
Amount available	1,055
Contingent maximum available borrowing			$ 2,000
Multi-year credit facilities | Edison International Parent and Other: | Commercial Paper
Line of Credit Facility
Outstanding borrowings	444	$ 246
Net of discount	$ 1	$ 0
Weighted average interest rate (as a percent)	4.86%	5.82%
Multi-year credit facilities | SCE
Line of Credit Facility
Variable rate on debt (as a percent)	1.08%
Commitment	$ 3,350
Outstanding borrowings	1,260
Outstanding letters of credit	6
Amount available	2,084
Contingent maximum available borrowing			$ 4,000
Multi-year credit facilities | SCE | Commercial Paper
Line of Credit Facility
Outstanding borrowings	1,259	$ 1,554
Net of discount	$ 1	$ 4
Weighted average interest rate (as a percent)	4.95%	5.82%
Other long-term debt | SCE
Line of Credit Facility
Variable rate on debt (as a percent)	0.90%	0.90%
Other long-term debt	$ 706	$ 722