Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Line Items]
Income (loss) from continuing operations before income taxes	$ 1,127	$ (1,089)	$ 949
Provision for income tax at federal statutory rate of 21% for 2019 and 2018, and 35% for 2017	237	(229)	332
Increase in income tax from:
State tax, net of federal benefit	(22)	(168)	2
Property-related	(303)	(275)	(439)
Change related to uncertain tax positions	0	(66)	(18)
Revised San Onofre Settlement Agreement	0	0	25
Share-based compensation	(4)	(2)	(55)
Deferred tax re-measurement	(88)	0	466
2018 GRC Final Decision	(80)	0	0
Other	(18)	1	(32)
Total continuing operations	$ (278)	$ (739)	$ 281
Effective tax rate	(24.70%)	(67.90%)	29.60%
State
Increase in income tax from:
Share-based compensation			$ (11)
SCE
Income Tax Disclosure [Line Items]
Income (loss) from continuing operations before income taxes	$ 1,301	$ (885)	1,106
Provision for income tax at federal statutory rate of 21% for 2019 and 2018, and 35% for 2017	273	(186)	387
Increase in income tax from:
State tax, net of federal benefit	(13)	(155)	8
Property-related	(303)	(275)	(439)
Change related to uncertain tax positions	0	(71)	(13)
Revised San Onofre Settlement Agreement	0	0	25
Share-based compensation	(3)	(1)	(11)
Deferred tax re-measurement	(88)	0	33
2018 GRC Final Decision	(80)	0	0
Other	(15)	(8)	(20)
Total continuing operations	$ (229)	$ (696)	$ (30)
Effective tax rate	(17.60%)	(78.60%)	(2.70%)
SCE | State
Increase in income tax from:
Share-based compensation			$ (2)