Commitments and Contingencies (Nuclear) (Details) - SCE $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Loss Contingencies [Line Items]
Limit on retroactive premium adjustments assessment, per year	$ 30
Palo Verde (nuclear)
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance	1,100
Federal loss limit, bodily injury and property damage from nuclear incident	13,500
Maximum per incident	65
Maximum per incident annual	10
Maximum per incident, prior events	255
Maximum per incident, prior events, annually	38
San Onofre
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance	50
Federal loss limit, bodily injury and property damage from nuclear incident	$ 560