Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Subtotal	$ 563	$ 543
Alternative revenue programs, net of amortization	1	(3)
Other accrued (deferred) revenues, net	0	(13)
Total retail revenues	564	553
Wholesale revenues	56	33
Other operating revenue	6	23
Total revenues	626	609
Gain on Derivative Instruments, Pretax	19	5
Residential [Member]
Disaggregation of Revenue [Line Items]
Subtotal	308	310
Commercial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	178	162
Industrial [Member]
Disaggregation of Revenue [Line Items]
Subtotal	69	60
Direct Access customers [Member]
Disaggregation of Revenue [Line Items]
Subtotal	$ 8	$ 11