Debt and Credit Agreements (Quarter) (Details) - SCE - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Aug. 31, 2021	Mar. 31, 2021	Feb. 28, 2021
2.25% first and refunding mortgage bonds due 2030
Debt Instrument [Line Items]
Debt			$ 150.0
Interest rate on debt (as a percent)			2.25%
2.95% first and refunding mortgage bonds due 2051
Debt Instrument [Line Items]
Debt			$ 750.0
Interest rate on debt (as a percent)			2.95%
0.64% first and refunding mortgage bonds due 2023
Debt Instrument [Line Items]
Debt	$ 400.0
0.64% first and refunding mortgage bonds due 2023 | SOFR
Debt Instrument [Line Items]
Basis points	0.64%
0.83% first and refunding mortgage bonds due 2024
Debt Instrument [Line Items]
Debt	$ 400.0
0.83% first and refunding mortgage bonds due 2024 | SOFR
Debt Instrument [Line Items]
Basis points	0.83%
0.70% first and refunding mortgage bonds due 2023
Debt Instrument [Line Items]
Debt	$ 350.0
Interest rate on debt (as a percent)	0.70%
1.10% first and refunding mortgage bonds due 2024
Debt Instrument [Line Items]
Debt	$ 700.0
Interest rate on debt (as a percent)	1.10%
2.50% first and refunding mortgage bonds due 2031
Debt Instrument [Line Items]
Debt	$ 450.0
2.50% first and refunding mortgage bonds due 2031 | SOFR
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	2.50%
3.65% first and refunding mortgage bonds due 2051
Debt Instrument [Line Items]
Debt	$ 450.0
3.65% first and refunding mortgage bonds due 2051 | SOFR
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	3.65%
Recovery Bonds
Debt Instrument [Line Items]
Debt			$ 338.0	$ 338.0
Recovery Bonds, 0.86% due 2033
Debt Instrument [Line Items]
Debt			$ 138.0
Interest rate on debt (as a percent)			0.861%
Recovery Bonds, 1.94% due 2040
Debt Instrument [Line Items]
Debt			$ 100.0
Interest rate on debt (as a percent)			1.94%
Recovery Bonds, 2.51% due 2045
Debt Instrument [Line Items]
Debt			$ 100.0
Interest rate on debt (as a percent)			2.51%
0.60% term loan due 2022
Debt Instrument [Line Items]
Debt	$ 1,200.0
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	$ 475.0
0.35% first and refunding mortgage bonds due 2022 | SOFR
Debt Instrument [Line Items]
Basis points	0.35%
0.70% first and refunding mortgage bonds due 2023
Debt Instrument [Line Items]
Debt		$ 400.0
Interest rate on debt (as a percent)		0.70%
0.98% first and refunding mortgage bonds due 2024
Debt Instrument [Line Items]
Debt		$ 450.0
Interest rate on debt (as a percent)		0.975%