Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Operating Revenue	[1]	$ 909	$ 692	$ 1,758	$ 1,436
Operating Expenses:
Fuel used in electric generation	[1]	254	120	428	252
Purchased power	[1]	27	27	58	43
Gas purchased for resale		89	50	194	131
Other operations and maintenance		109	117	226	216
Other operations and maintenance - affiliated suppliers		39	47	82	100
Impairment of assets and other charges		4	259	4	319
Depreciation and amortization		126	119	251	240
Other taxes	[1]	71	62	144	127
Total operating expenses		719	801	1,387	1,428
Operating income (loss)		190	(109)	371	8
Other income (expense), net		20	(12)	24	(6)
Interest charges, net of allowance for borrowed funds used during construction	[1]	53	54	105	109
Income (loss) before income tax expense		157	(175)	290	(107)
Income tax expense (benefit)		31	(49)	57	(36)
Net Income (Loss) and Other Comprehensive Income (Loss)		126	(126)	233	(71)
Comprehensive Income Attributable to Noncontrolling Interest		7	5	11	9
Comprehensive Income (Loss) Available to Common Shareholder		$ 119	$ (131)	$ 222	$ (80)

[1] See Note 12 for amounts attributable to affiliates.