Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosures [Line Items]
(Loss) income from operations before income taxes	$ (517)	$ 480	$ (36)	$ 1,020
Provision for income tax at federal statutory rate of 21%	(108)	101	(7)	214
Increase (decrease) in income tax from:
State tax, net of federal benefit	(67)	5	(74)	0
Property-related	(81)	(124)	(228)	(267)
Change related to uncertain tax position	0	0	(15)	0
Deferred tax re-measurement	0	0	0	(69)
2018 GRC Decision	0	0	0	(80)
Other	(19)	(4)	(31)	(10)
Total income tax benefit	$ (275)	$ (22)	$ (355)	$ (212)
Effective tax rate	(53.20%)	(4.60%)	(986.10%)	(20.80%)
Southern California Edison
Income Tax Disclosures [Line Items]
(Loss) income from operations before income taxes	$ (469)	$ 524	$ 142	$ 1,123
Provision for income tax at federal statutory rate of 21%	(98)	110	30	236
Increase (decrease) in income tax from:
State tax, net of federal benefit	(61)	8	(62)	6
Property-related	(81)	(124)	(228)	(267)
Change related to uncertain tax position	0	0	(18)	0
Deferred tax re-measurement	0	0	0	(69)
2018 GRC Decision	0	0	0	(80)
Other	(11)	(4)	(22)	(9)
Total income tax benefit	$ (251)	$ (10)	$ (300)	$ (183)
Effective tax rate	(53.50%)	(1.90%)	(211.30%)	(16.30%)