Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (57)	$ (221)	$ (46)
State	(155)	4	33
Total current	(212)	(217)	(13)
Deferred:
Federal	(386)	570	176
State	(141)	(72)	14
Total deferred	(527)	498	190
Total continuing operations	(739)	281	177
Discontinued operations	(34)	0	(11)
Total	(773)	281	166
SCE
Current:
Federal	(51)	(253)	75
State	(93)	(81)	93
Total current	(144)	(334)	168
Deferred:
Federal	(354)	265	112
State	(198)	39	(24)
Total deferred	(552)	304	88
Total continuing operations	(696)	(30)	256
Discontinued operations	0	0	0
Total	$ (696)	$ (30)	$ 256