Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) site	Jun. 30, 2022 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 252
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent
Environmental remediation regulatory assets	$ 234
Expected recovery from incentive mechanism	$ 35
Expected recovery from incentive mechanism (percent)	90.00%
Recovery through customer rates	$ 199
Recovery through customer rates (percent)	100.00%
Environmental remediation expense	$ 7	$ 4
Clean up (period)	40 years
Expected remediation costs, low end of range	$ 8
Expected remediation costs, high end of range	$ 28
Material sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	25
Minimum estimated liability	$ 1
Recorded estimated minimum liability	249
Cost may exceed liability	120
Material sites | San Onofre
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 162
Immaterial sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	13
Recorded estimated minimum liability	$ 3
Cost may exceed liability	$ 7