Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 213	$ 194
Tax payments (refunds), net	26	1
Dividends declared but not paid:
Common stock	110	106
Preferred and preference stock	29	34
Southern California Edison
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	205	194
Tax payments (refunds), net	17	(2)
Dividends declared but not paid:
Common stock	0	0
Preferred and preference stock	29	34
Accrued capital expenditures	$ 515	$ 408