Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Subtotal	$ 610	$ 560	$ 1,826	$ 1,623
Alternative revenue programs, net of amortization	1	1	6	5
Other Cost of Operating Revenue	1
Other accrued (deferred) revenues, net		(6)	(2)	(6)
Total retail revenues	612	567	1,830	1,634
Wholesale revenues	173	160	323	281
Other operating revenue	17	16	45	45
Total revenues	802	743	2,198	1,960
Gain on Derivative Instruments, Pretax	96	67	152	100
Residential [Member]
Disaggregation of Revenue [Line Items]
Subtotal	301	283	942	841
Commercial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	213	194	606	540
Industrial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	89	74	258	216
Direct Access customers [Member]
Disaggregation of Revenue [Line Items]
Subtotal	$ 7	$ 9	$ 20	$ 26