Commitments and Contingencies - Environmental Remediation (Details) - SCE $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) site	Mar. 31, 2024 USD ($)
Commitments and Contingencies
Recorded estimated minimum liability	$ 230
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Other deferred credits and other long-term liabilities
Environmental remediation regulatory assets	$ 219
Expected recovery from incentive mechanism	$ 34
Expected recovery from incentive mechanism (percent)	90.00%
Recovery through customer rates	$ 185
Recovery through customer rates (percent)	100.00%
Clean up (period)	35 years
Expected remediation costs, low end of range	$ 9
Expected remediation costs, high end of range	21
Environmental remediation expense	$ 4	$ 2
Material sites
Commitments and Contingencies
Identified remediation sites (number) | site	19
Minimum estimated liability	$ 1
Recorded estimated minimum liability	226
Cost may exceed liability	98
Material sites | San Onofre
Commitments and Contingencies
Recorded estimated minimum liability	$ 152
Immaterial sites
Commitments and Contingencies
Identified remediation sites (number) | site	16
Recorded estimated minimum liability	$ 4
Cost may exceed liability	$ 2