Debt and Credit Agreements - Summarizes Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt
Current portion of long-term debt	$ (2,049)	$ (2,697)
Long-term debt (include $1,468 and $1,515 related to a VIE at respective dates)	33,534	30,316
Edison International Parent and Other:
Debt
Current portion of long-term debt	(800)	(500)
Unamortized debt discount/premium and issuance costs, net	(32)	(31)
Long-term debt (include $1,468 and $1,515 related to a VIE at respective dates)	4,268	4,019
Edison International Parent and Other: | Debentures and notes:
Debt
Long-term debt	$ 5,100	4,550
Edison International Parent and Other: | Debentures and notes: | Minimum
Debt
Interest rate on debt (as a percent)	4.125%
Edison International Parent and Other: | Debentures and notes: | Maximum
Debt
Interest rate on debt (as a percent)	8.125%
SCE
Debt
Current portion of long-term debt	$ (1,249)	(2,197)
Unamortized debt discount/premium and issuance costs, net	(181)	(165)
Long-term debt (include $1,468 and $1,515 related to a VIE at respective dates)	29,266	26,297
SCE | Debentures and notes:
Debt
Long-term debt	$ 306	306
SCE | Debentures and notes: | Minimum
Debt
Interest rate on debt (as a percent)	5.06%
SCE | Debentures and notes: | Maximum
Debt
Interest rate on debt (as a percent)	6.65%
SCE | First and refunding mortgage bonds:
Debt
Long-term debt	$ 27,400	24,700
SCE | First and refunding mortgage bonds: | Minimum
Debt
Interest rate on debt (as a percent)	1.20%
SCE | First and refunding mortgage bonds: | Maximum
Debt
Interest rate on debt (as a percent)	6.05%
SCE | Pollution-control bonds:
Debt
Long-term debt	$ 752	752
SCE | Pollution-control bonds: | Minimum
Debt
Interest rate on debt (as a percent)	1.45%
SCE | Pollution-control bonds: | Maximum
Debt
Interest rate on debt (as a percent)	4.50%
SCE | Senior secured recovery bonds
Debt
Long-term debt	$ 1,532	1,579
SCE | Senior secured recovery bonds | Minimum
Debt
Interest rate on debt (as a percent)	0.86%
SCE | Senior secured recovery bonds | Maximum
Debt
Interest rate on debt (as a percent)	5.11%
SCE | Other long-term debt
Debt
Long-term debt	$ 706	1,322
Other long-term debt	$ 706	722
Term loan		$ 600
Variable rate on debt (as a percent)	0.90%	0.90%