Debt and Credit Agreements (Term loan) (Details) - SCE - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jan. 31, 2022
0.60% term loan due 2022
Debt Instrument [Line Items]
Debt, face amount	$ 1,200
0.60% term loan due 2022 | SOFR
Debt Instrument [Line Items]
Basis points	0.60%
0.35% first and refunding mortgage bonds due 2022
Debt Instrument [Line Items]
Debt, face amount	$ 475
0.35% first and refunding mortgage bonds due 2022 | SOFR
Debt Instrument [Line Items]
Basis points	0.35%
0.47% first and refunding mortgage bonds due 2022
Debt Instrument [Line Items]
Debt, face amount	$ 550
0.47% first and refunding mortgage bonds due 2022 | SOFR
Debt Instrument [Line Items]
Basis points	0.47%
2.75% first and refunding mortgage bonds due 2032
Debt Instrument [Line Items]
Debt, face amount			$ 500
Interest rate on debt (as a percent)			2.75%
3.45% first and refunding mortgage bonds due 2052
Debt Instrument [Line Items]
Debt, face amount			$ 700
Interest rate on debt (as a percent)			3.45%
Series 2021-A senior secured recovery bonds
Debt Instrument [Line Items]
Debt, face amount	$ 338
Series 2021-A senior secured recovery bonds | Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	0.86%
Series 2021-A senior secured recovery bonds | Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	2.51%
Series 2022-A senior secured recovery bonds
Debt Instrument [Line Items]
Debt, face amount		$ 533
Recovery Bonds, 1.98% due 2030
Debt Instrument [Line Items]
Debt, face amount		$ 100
Interest rate on debt (as a percent)		1.98%
Recovery Bonds, 2.94% due 2044
Debt Instrument [Line Items]
Debt, face amount		$ 305
Interest rate on debt (as a percent)		2.94%
Recovery Bonds, 3.24% due 2048
Debt Instrument [Line Items]
Debt, face amount		$ 128
Interest rate on debt (as a percent)		3.24%