Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 431	$ 394
Tax payments (refunds), net	27	(239)
Dividends declared but not paid:
Common stock	110	106
Preferred and preference stock	4	6
Southern California Edison
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	415	394
Tax payments (refunds), net	18	(243)
Dividends declared but not paid:
Common stock	120	0
Preferred and preference stock	4	6
Accrued capital expenditures	$ 401	$ 414