Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 167	$ 158
Tax payments, net of refunds	0	2
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	152	149
Tax payments, net of refunds	0	11
Non-cash financing and investing activities:
Accrued capital expenditures	275	360
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid	0	0
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	$ 1	$ 1