Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 595	$ 548	$ 504
Tax (refunds) payments, net	(135)	1	18
Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	200	197	177
Preference stock
Non-cash financing and investing activities:
Dividends declared but not paid	12	12	12
SCE
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	552	509	475
Tax (refunds) payments, net	(57)	2	78
Non-cash financing and investing activities:
Accrued capital expenditures	594	652	540
SCE | Common Stock
Non-cash financing and investing activities:
Dividends declared but not paid	0	212	0
SCE | Preference stock
Non-cash financing and investing activities:
Dividends declared but not paid	$ 12	$ 12	$ 12