Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 167	$ 151
Tax payments (refunds), net	6	(4)
Dividends declared but not paid:
Common stock	110	106
Preferred and preference stock	7	10
Southern California Edison
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	159	151
Tax payments (refunds), net	(3)	(1)
Dividends declared but not paid:
Common stock	0	0
Preferred and preference stock	7	10
Accrued capital expenditures	$ 507	$ 412