Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosures [Line Items]
Income from operations before income taxes	$ 480		$ 627	$ 1,020	$ 1,127
Provision for income tax at federal statutory rate of 21%	101		132	214	237
Increase in income tax from:
State tax, net of federal benefit	5		26	0	21
Property-related	(124)		(76)	(267)	(214)
Change related to uncertain tax positions	0		1	0	1
Share-based compensation	(1)		(1)	(3)	(1)
2018 GRC Final Decision	0		0	(80)	0
Deferred tax re-measurement	0		0	(69)	0
Other	(3)		1	(7)	(1)
Total income tax benefit	$ (22)		$ 83	$ (212)	$ 43
Effective tax rate	(4.60%)		13.20%	(20.80%)	3.80%
Southern California Edison
Income Tax Disclosures [Line Items]
Income from operations before income taxes	$ 524		$ 653	$ 1,123	$ 1,288
Provision for income tax at federal statutory rate of 21%	110		137	236	270
Increase in income tax from:
State tax, net of federal benefit	8		29	6	33
Property-related	(124)		(76)	(267)	(214)
Change related to uncertain tax positions	0		(1)	0	(2)
Share-based compensation	0		(1)	(2)	(1)
2018 GRC Final Decision	0	$ (80)	0	(80)	0
Deferred tax re-measurement	0		0	(69)	0
Other	(4)		(2)	(7)	(8)
Total income tax benefit	$ (10)		$ 86	$ (183)	$ 78
Effective tax rate	(1.90%)		13.20%	(16.30%)	6.10%