Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash payments (receipts):
Interest, net of amounts capitalized	$ 705	$ 595	$ 548
Tax refunds, net	(85)	(135)
Tax payments, net			1
Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	231	200	197
Preferred and Preference Stock
Non-cash financing and investing activities:
Dividends declared but not paid	12	12	12
SCE
Cash payments (receipts):
Interest, net of amounts capitalized	615	552	509
Tax refunds, net	(164)	(57)
Tax payments, net			2
Non-cash financing and investing activities:
Accrued capital expenditures	643	594	652
SCE | Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	200	0	212
SCE | Preferred and Preference Stock
Non-cash financing and investing activities:
Dividends declared but not paid	$ 12	$ 12	$ 12