Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 453	$ 417
Tax payments, net of refunds	13	12
Common stock
Dividends declared but not paid:
Dividends declared but not paid	177	156
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	1	1
Southern California Edison
Cash payments for interest and taxes:
Interest, net of amounts capitalized	421	408
Tax payments, net of refunds	20	35
Dividends declared but not paid:
Accrued capital expenditures	319	268
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid	191	0
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	$ 1	$ 1