Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosures [Line Items]
Income from operations before income taxes	$ 352	$ 344	$ 481	$ 540
Provision for income tax at federal statutory rate of 21%	74	72	101	113
Increase (decrease) in income tax from:
State tax, net of federal benefit	6	2	(7)	(5)
Property-related	(69)	(74)	(147)	(143)
Change related to uncertain tax position	0	0	(15)	0
Deferred tax re-measurement	0	0	0	(69)
2018 GRC Decision	0	(80)	0	(80)
Other	(7)	2	(12)	(6)
Total income tax expense (benefit)	$ 4	$ (78)	$ (80)	$ (190)
Effective tax rate	1.10%	(22.70%)	(16.60%)	(35.20%)
Southern California Edison
Income Tax Disclosures [Line Items]
Income from operations before income taxes	$ 437	$ 381	$ 611	$ 599
Provision for income tax at federal statutory rate of 21%	92	80	129	126
Increase (decrease) in income tax from:
State tax, net of federal benefit	11	3	(1)	(2)
Property-related	(69)	(74)	(147)	(143)
Change related to uncertain tax position	(1)	0	(18)	0
Deferred tax re-measurement	0	0	0	(69)
2018 GRC Decision	0	(80)	0	(80)
Other	(7)	3	(12)	(5)
Total income tax expense (benefit)	$ 26	$ (68)	$ (49)	$ (173)
Effective tax rate	5.90%	(17.80%)	(8.00%)	(28.90%)