Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 118	$ 190	$ 443	$ 721
Other comprehensive income (loss):
Adjustment to pension and other postretirement plans (net of tax expense (benefit) of $-0-, $4, $-0- and $4)	0	(23)	(1)	(22)
Reclassification of deferred loss from cash flow hedges realized in net income (net of tax of $-0-, $-0-, $-0- and $-0-)	0	0	0	1
Total	0	(23)	(1)	(21)
Comprehensive income	118	167	442	700
Income allocated to preferred shareholders	12	11	24	24
Comprehensive income available to common shareholders	$ 106	$ 156	$ 418	$ 676