Commitments and Contingencies (Environmental Remediation) (Details) - SCE $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($) site	Jun. 30, 2023 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 246
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent
Environmental remediation regulatory assets	$ 226
Expected recovery from incentive mechanism	$ 35
Expected recovery from incentive mechanism (percent)	90.00%
Recovery through customer rates	$ 191
Recovery through customer rates (percent)	100.00%
Clean up (period)	35 years
Expected remediation costs, low end of range	$ 13
Expected remediation costs, high end of range	23
Environmental remediation expense	$ 4	$ 7
Material sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	20
Minimum estimated liability	$ 1
Recorded estimated minimum liability	242
Cost may exceed liability	107
Material sites | San Onofre
Jointly Owned Utility Plant Interests [Line Items]
Recorded estimated minimum liability	$ 157
Immaterial sites
Jointly Owned Utility Plant Interests [Line Items]
Identified remediation sites (number) | site	17
Recorded estimated minimum liability	$ 4
Cost may exceed liability	$ 2