Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 196	$ 211
Provision for income tax at federal statutory rate of 21%	41	44
Increase in income tax from:
State tax, net of federal benefit	(7)	(5)
Property-related	(69)	(69)
Shared-based compensation	(2)	0
Deferred tax re-measurement	(69)	0
Other	(6)	(1)
Total income tax benefit from continuing operations	$ (112)	$ (31)
Effective tax rate	(57.10%)	(14.70%)
State
Increase in income tax from:
Shared-based compensation	$ 1
Southern California Edison
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	218	$ 310
Provision for income tax at federal statutory rate of 21%	46	65
Increase in income tax from:
State tax, net of federal benefit	(5)	1
Property-related	(69)	(69)
Shared-based compensation	(2)	0
Deferred tax re-measurement	(69)	0
Other	(6)	(3)
Total income tax benefit from continuing operations	$ (105)	$ (6)
Effective tax rate	(48.20%)	(1.90%)
Southern California Edison | State
Increase in income tax from:
Shared-based compensation	$ 1