Commitments and Contingencies (Nuclear Insurance) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
SCE
Loss Contingencies [Line Items]
Litigation settlement	$ 69
SCE | Insurance Claims
Loss Contingencies [Line Items]
Limit on retroactive premium adjustments assessment, per year	30
SCE | Insurance Claims | 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
SCE | Insurance Claims | 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
SCE and other owners of San Onofre and Palo Verde
Loss Contingencies [Line Items]
Litigation settlement	$ 88