Debt and Credit Agreements (Term-loan And Other Short-term Debt) (Details) - SCE	12 Months Ended
	Dec. 31, 2020 USD ($)
Mortgages
Short-term Debt [Line Items]
Debt, face amount	$ 900,000,000
LIBOR | Mortgages
Short-term Debt [Line Items]
Basis points	0.27%
SCE Term loan credit agreement
Short-term Debt [Line Items]
Debt, face amount	$ 475,000,000
SCE Term loan credit agreement | LIBOR
Short-term Debt [Line Items]
Basis points	0.60%