Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 158	$ 152
Tax payments (refunds), net	2	0
Common stock
Dividends declared but not paid:
Dividends declared but not paid:	156	136
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	1	3
Southern California Edison
Cash payments for interest and taxes:
Interest, net of amounts capitalized	149	144
Tax payments (refunds), net	11	32
Dividends declared but not paid:
Accrued capital expenditures	360	407
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid:	0	147
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid:	$ 1	$ 3