Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - SCE	Dec. 31, 2024
Generation plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	10 years
Generation plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	54 years
Generation plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	39 years
Distribution plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	20 years
Distribution plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	67 years
Distribution plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	50 years
Transmission plant | Minimum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	30 years
Transmission plant | Maximum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	65 years
Transmission plant | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	53 years
General plant and other | Minimum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	5 years
General plant and other | Maximum
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	60 years
General plant and other | Weighted Average
Property, Plant and Equipment [Line Items]
Estimated and Weighted Average Useful Lives	19 years