Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 509	$ 453
Tax refunds, net	(92)
Tax payments, net		13
Common stock
Dividends declared but not paid:
Dividends declared but not paid:	197	177
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	0	1
Southern California Edison
Cash payments for interest and taxes:
Interest, net of amounts capitalized	466	421
Tax refunds, net	(17)
Tax payments, net		20
Dividends declared but not paid:
Accrued capital expenditures	421	319
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid:	314	191
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	$ 0	$ 1