Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Subtotal	$ 560	$ 527	$ 1,623	$ 1,564
Alternative revenue programs, net of amortization	1	(12)	5	(23)
Other Cost of Operating Revenue	6
Other accrued (deferred) revenues, net		1	6	12
Total retail revenues	567	516	1,634	1,553
Wholesale revenues	160	112	281	186
Other operating revenue	16	14	45	49
Total revenues	743	642	1,960	1,788
Gain on Derivative Instruments, Pretax	67	37	100	46
Residential [Member]
Disaggregation of Revenue [Line Items]
Subtotal	283	265	841	824
Commercial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	194	186	540	518
Industrial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	74	65	216	187
Direct Access customers [Member]
Disaggregation of Revenue [Line Items]
Subtotal	$ 9	$ 11	$ 26	$ 35