Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 344	$ 289	$ 540	$ 500
Provision for income tax at federal statutory rate of 21%	72	61	113	105
Increase in income tax from:
State tax, net of federal benefit	2	0	(5)	(5)
Property-related	(74)	(69)	(143)	(138)
Shared-based compensation	0	0	(2)	0
2018 GRC Final Decision	(80)	0	(80)	0
Deferred tax re-measurement	0	0	(69)	0
Other	2	(1)	(4)	(2)
Total income tax benefit from continuing operations	$ (78)	$ (9)	$ (190)	$ (40)
Effective tax rate	(22.70%)	(3.10%)	(35.20%)	(8.00%)
Southern California Edison
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 381	$ 325	$ 599	$ 635
Provision for income tax at federal statutory rate of 21%	80	68	126	133
Increase in income tax from:
State tax, net of federal benefit	3	3	(2)	4
Property-related	(74)	(69)	(143)	(138)
Shared-based compensation	0	0	(2)	0
2018 GRC Final Decision	(80)	0	(80)	0
Deferred tax re-measurement	0	0	(69)	0
Other	3	(4)	(3)	(7)
Total income tax benefit from continuing operations	$ (68)	$ (2)	$ (173)	$ (8)
Effective tax rate	(17.80%)	(0.60%)	(28.90%)	(1.30%)