Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Operating Revenue	[1]	$ 3,028	$ 3,783	$ 3,146
Operating Expenses:
Fuel used in electric generation	[1]	582	1,000	646
Purchased power	[1]	72	137	116
Gas purchased for resale	[1]	243	433	285
Other operations and maintenance		436	460	417
Other operations and maintenance – affiliated suppliers		163	164	189
Impairment of assets and other charges		3	6	320
Depreciation and amortization		531	507	486
Other taxes	[1]	292	277	255
Total operating expenses		2,322	2,984	2,714
Operating income		706	799	432
Other income (expense), net		24	55	(2)
Interest charges, net of AFUDC	[1]	250	220	192
Income before income tax expense		480	634	238
Income tax expense		85	131	9
Net Income		395	503	229
Other Comprehensive Income (Loss):
Deferred cost of employee benefit plans, net of tax		1	(1)	1
Total Comprehensive Income		396	502	230
Comprehensive Income Attributable to Noncontrolling Interest		21	20	21
Comprehensive Income Available to Common Shareholder		$ 375	$ 482	$ 209

[1] See Note 16 for amounts attributable to affiliates.