Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Apr. 29, 2025	Nov. 30, 2024	Mar. 31, 2025
Public Utilities, General Disclosures [Line Items]
Revenue not yet approved		$ 1,300
Requested increase (decrease) revenue requirement		$ 220
Requested increase (decrease) revenue requirement (as a percent)		20.00%
SCE
Public Utilities, General Disclosures [Line Items]
Revenue not yet approved			$ 10,300
Requested increase (decrease) revenue requirement			$ 1,900
Requested increase (decrease) revenue requirement (as a percent)			23.00%
Requested renewable resource cost adjustment rate tariff			$ 8,400
SCE | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested renewable resource cost adjustment rate tariff	$ 10,400