Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) site	Sep. 30, 2022 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 254
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent
Environmental remediation regulatory assets	$ 233
Expected recovery from incentive mechanism	$ 36
Expected recovery from incentive mechanism (percent)	90.00%
Recovery through customer rates	$ 197
Recovery through customer rates (percent)	100.00%
Environmental remediation expense	$ 9	$ 5
Clean up (period)	40 years
Expected remediation costs, low end of range	$ 9
Expected remediation costs, high end of range	$ 26
Material sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	26
Minimum estimated liability	$ 1
Recorded estimated minimum liability	251
Cost may exceed liability	120
Material sites | San Onofre
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 159
Immaterial sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	12
Recorded estimated minimum liability	$ 3
Cost may exceed liability	$ 5