Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 452	$ 423	$ 370
Tax payments (refunds), net	165	119	(328)
Details of debt exchange:
Pollution-control bonds redeemed	0	(86)	(378)
Pollution-control bonds issued	0	86	378
Deconsolidation of variable interest entities:
Assets other than cash	0	0	306
Liabilities and non-controlling interest	0	0	(398)
Dividends declared but not paid:
Common stock	110	106	104
Preferred and preference stock	24	11	13
Southern California Edison
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	437	408	369
Tax payments (refunds), net	279	86	127
Details of debt exchange:
Pollution-control bonds redeemed	0	(86)	(378)
Pollution-control bonds issued	0	86	378
Deconsolidation of variable interest entities:
Assets other than cash	0	0	306
Liabilities and non-controlling interest	0	0	(398)
Dividends declared but not paid:
Common stock	0	0	0
Preferred and preference stock	24	11	13
Accrued capital expenditures	$ 671	$ 685	$ 648