Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ (99)	$ (97)	$ 0
State	20	(9)	0
Total Current Income Tax Expense (Benefit)	(79)	(106)	0
Deferred:
Federal	454	317	132
State	68	31	135
Total Deferred Income Tax Expense (Benefit)	522	348	267
Total income tax expense from continuing operations	443	242	267
Discontinued operations	(710)	(36)	(549)
Total	(267)	206	(282)
Southern California Edison
Current:
Federal	(89)	(119)	0
State	101	(19)	50
Total Current Income Tax Expense (Benefit)	12	(138)	50
Deferred:
Federal	476	345	136
State	(14)	72	28
Total Deferred Income Tax Expense (Benefit)	462	417	164
Total income tax expense from continuing operations	474	279	214
Discontinued operations	0	0	0
Total	$ 474	$ 279	$ 214