Debt and Credit Agreements (Long-term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt
Current portion of long-term debt	$ (2,697)	$ (2,614)
Long-term debt	30,316	27,025
Edison International Parent and Other
Debt
Current portion of long-term debt	(500)	(400)
Unamortized debt discount/premium and issuance costs, net	(31)	(19)
Long-term debt	4,019	2,981
Edison International Parent and Other | Debentures and notes
Debt
Long-term debt	$ 4,550	3,400
Edison International Parent and Other | Debentures and notes | Minimum
Debt
Interest rate on debt (as a percent)	3.55%
Edison International Parent and Other | Debentures and notes | Maximum
Debt
Interest rate on debt (as a percent)	8.13%
SCE
Debt
Current portion of long-term debt	$ (2,197)	(2,214)
Unamortized debt discount/premium and issuance costs, net	(165)	(149)
Long-term debt	26,297	24,044
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	$ 24,700	23,900
SCE | First and refunding mortgage bonds | Minimum
Debt
Interest rate on debt (as a percent)	0.98%
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	$ 1,579	849
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	$ 1,322	$ 600
Other long-term debt	$ 722
SCE | Other long-term debt | Secured Overnight Financing Rate ("SOFR")
Debt
Variable rate on debt (as a percent)	0.90%	0.90%