Supplemental Cash Flows Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	$ 157	$ 167
Tax payments (refunds), net	0	6
Southern California Edison
Cash payments (receipts) for interest and taxes:
Interest, net of amounts capitalized	149	159
Tax payments (refunds), net	3	(3)
Dividends declared but not paid:
Accrued capital expenditures	438	507
Common Stock
Dividends declared but not paid:
Dividends declared but not paid	116	110
Common Stock | Southern California Edison
Dividends declared but not paid:
Dividends declared but not paid	126	0
Preferred Stock and Preference Stock
Dividends declared but not paid:
Dividends declared but not paid	4	7
Preferred Stock and Preference Stock | Southern California Edison
Dividends declared but not paid:
Dividends declared but not paid	$ 4	$ 7