Commitments and Contingencies (Nuclear) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Palo Verde (nuclear)
Loss Contingencies [Line Items]
Federal loss limit, bodily injury and property damage from nuclear incident	$ 13,500
San Onofre
Loss Contingencies [Line Items]
Federal loss limit, bodily injury and property damage from nuclear incident	560
SCE
Loss Contingencies [Line Items]
Limit on retroactive premium adjustments assessment, per year	30
SCE | Palo Verde (nuclear)
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance	1,100
Maximum per incident	65
Maximum per incident annual	10
Maximum per incident, prior events	255
Maximum per incident, prior events, annually	38
SCE | San Onofre
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance	50
SCE and other owners of San Onofre and Palo Verde
Loss Contingencies [Line Items]
Maximum private primary insurance	$ 450