Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($) site	Jun. 30, 2021 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 263
Environmental remediation regulatory assets	244
Expected recovery from incentive mechanism	$ 38
Expected recovery from incentive mechanism (percent)	90.00%
Recovery through customer rates	$ 206
Recovery through customer rates (percent)	100.00%
Environmental remediation expense	$ 4	$ 5
Clean up (period)	40 years
Expected remediation costs, low end of range	$ 7
Expected remediation costs, high end of range	$ 27
Material sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	26
Minimum estimated liability	$ 1
Recorded estimated minimum liability	259
Cost may exceed liability	118
Material sites | San Onofre
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 166
Immaterial sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	14
Recorded estimated minimum liability	$ 4
Cost may exceed liability	$ 9