Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Operating Revenue	[1]	$ 759	$ 849
Operating Expenses:
Fuel used in electric generation		150	174
Purchased power	[1]	7	31
Gas purchased for resale		82	105
Other operations and maintenance		115	117
Other operations and maintenance - affiliated suppliers		41	43
Depreciation and amortization		129	125
Other taxes	[1]	78	73
Total operating expenses		602	668
Operating income		157	181
Other income, net		10	4
Interest charges, net of AFUDC	[1]	59	52
Income before income tax expense		108	133
Income tax expense		11	26
Net Income and Other Comprehensive Income		97	107
Comprehensive Income Attributable to Noncontrolling Interest		5	4
Comprehensive Income Available to Common Shareholder		$ 92	$ 103

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