Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 0	$ (279)	$ (143)
State	0	80	(104)
Total Current Income Tax Expense (Benefit)	0	(199)	(247)
Deferred:
Federal	132	727	614
State	135	40	(32)
Total Deferred Income Tax Expense (Benefit)	267	767	582
Total income tax expense from continuing operations	267	568	335
Discontinued operations	(549)	(853)	27
Total	(282)	(285)	362
Southern California Edison
Current:
Federal	0	(275)	(145)
State	50	91	(71)
Total Current Income Tax Expense (Benefit)	50	(184)	(216)
Deferred:
Federal	136	757	663
State	28	28	(7)
Total Deferred Income Tax Expense (Benefit)	164	785	656
Total income tax expense from continuing operations	214	601	440
Discontinued operations	0	0	0
Total	$ 214	$ 601	$ 440