Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Subtotal	$ 500	$ 494	$ 1,063	$ 1,037
Alternative revenue programs, net of amortization	3	(8)	4	(11)
Other Cost of Operating Revenue	0
Other accrued (deferred) revenues, net		(2)	0	(11)
Total retail revenues	503	484	1,067	1,037
Wholesale revenues	65	41	121	74
Other operating revenue	23	12	29	35
Total revenues	591	537	1,217	1,146
Gain on Derivative Instruments, Pretax	14	4	33	9
Residential [Member]
Disaggregation of Revenue [Line Items]
Subtotal	250	249	558	559
Commercial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	168	170	346	332
Industrial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	73	62	142	122
Direct Access customers [Member]
Disaggregation of Revenue [Line Items]
Subtotal	$ 9	$ 13	$ 17	$ 24