Commitments and Contingencies (Nuclear Insurance) (Details) - USD ($)		12 Months Ended
	Jan. 05, 2018	Dec. 31, 2018
SCE | Palo Verde (nuclear)
Loss Contingencies [Line Items]
Maximum per incident	$ 65,000,000
Maximum per incident annual	9,700,000
Maximum per incident, prior events	255,000,000
Maximum per incident, prior events, annually	$ 38,000,000
Insurance Claims | Palo Verde (nuclear)
Loss Contingencies [Line Items]
Federal loss limit, bodily injury and property damage from nuclear incident		$ 14,100,000,000
Insurance Claims | San Onofre
Loss Contingencies [Line Items]
Federal limit on public liability claims from nuclear incident, approximate		560,000,000
Insurance Claims | SCE and other owners of San Onofre and Palo Verde | Palo Verde (nuclear)
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance		1,060,000,000.00
Insurance Claims | SCE and other owners of San Onofre and Palo Verde | San Onofre
Loss Contingencies [Line Items]
Minimum federal requirement of nuclear property insurance		50,000,000
Insurance Claims | SCE
Loss Contingencies [Line Items]
Limit on assessment of retrospective premium adjustments, per year, approximate		$ 52,000,000