Summary of Significant Accounting Policies (Revenue) (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2021	Dec. 31, 2020	Mar. 31, 2022
SCE
Public Utilities, General Disclosures [Line Items]
Revenue not yet approved			$ 43
Requested increase (decrease) revenue requirement		$ 214
2022 Formula Rate
Public Utilities, General Disclosures [Line Items]
Requested increase (decrease) revenue requirement	$ 326
Requested increase (decrease) revenue requirement (as a percent)	30.00%