Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
(Loss) income from continuing operations before income taxes	$ (1,089)	$ 949	$ 1,590
Provision for income tax at federal statutory rate of 21% and 35%, respectively1	(229)	332	556
Increase in income tax from:
State tax, net of federal benefit	(168)	2	29
Property-related	(275)	(439)	(362)
Change related to uncertain tax positions	(66)	(18)	(4)
Revised San Onofre Settlement Agreement	0	25	0
Share-based compensation	(2)	(55)	(28)
Deferred tax re-measurement	0	466	0
Other	1	(32)	(14)
Total continuing operations	$ (739)	$ 281	$ 177
Effective tax rate	(67.90%)	29.60%	11.10%
State
Increase in income tax from:
Share-based compensation		$ (11)	$ (4)
SCE
Income Tax Disclosure [Line Items]
(Loss) income from continuing operations before income taxes	$ (885)	1,106	1,755
Provision for income tax at federal statutory rate of 21% and 35%, respectively1	(186)	387	614
Increase in income tax from:
State tax, net of federal benefit	(155)	8	43
Property-related	(275)	(439)	(362)
Change related to uncertain tax positions	(71)	(13)	(8)
Revised San Onofre Settlement Agreement	0	25	0
Share-based compensation	(1)	(11)	(13)
Deferred tax re-measurement	0	33	0
Other	(8)	(20)	(18)
Total continuing operations	$ (696)	$ (30)	$ 256
Effective tax rate	(78.60%)	(2.70%)	14.60%
SCE | State
Increase in income tax from:
Share-based compensation		$ (2)	$ (1)