Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal		$ 18	$ (99)	$ (97)
State		19	20	(9)
Total Current Income Tax Expense (Benefit)		37	(79)	(106)
Deferred:
Federal		340	454	317
State		109	68	31
Total Deferred Income Tax Expense (Benefit)		449	522	348
Total income tax expense from continuing operations		486	443	242
Discontinued operations	[1]	(21)	(710)	(36)
Total		465	(267)	206
Southern California Edison
Current:
Federal		72	(89)	(119)
State		127	101	(19)
Total Current Income Tax Expense (Benefit)		199	12	(138)
Deferred:
Federal		298	476	345
State		10	(14)	72
Total Deferred Income Tax Expense (Benefit)		308	462	417
Total income tax expense from continuing operations		507	474	279
Discontinued operations	[1]	0	0	0
Total		$ 507	$ 474	$ 279

[1] See Note 15 for a discussion of discontinued operations related to EME.