Income Taxes (Components of Income Tax Expense (Benefit) by Location) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 0	$ (57)	$ (221)
State	6	(155)	4
Total current	6	(212)	(217)
Deferred:
Federal	(243)	(386)	570
State	(41)	(141)	(72)
Total deferred	(284)	(527)	498
Total continuing operations	(278)	(739)	281
Discontinued operations	0	(34)	0
Total	(278)	(773)	281
SCE
Current:
Federal	0	(51)	(253)
State	14	(93)	(81)
Total current	14	(144)	(334)
Deferred:
Federal	(206)	(354)	265
State	(37)	(198)	39
Total deferred	(243)	(552)	304
Total continuing operations	(229)	(696)	(30)
Discontinued operations	0	0	0
Total	$ (229)	$ (696)	$ (30)