Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 282	$ 202	$ 725	$ 923
Other comprehensive income (loss):
Adjustment to pension and other postretirement plans (net of tax expense (benefit) of $-0-, $(9), $-0- and $(5))	1	2	0	(20)
Net deferred gain from cash flow hedges (net of tax of $-0-, $-0-, $-0- and $-0-)	2	0	2	0
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	3	2	2	(19)
Comprehensive income (loss)	285	204	727	904
Income allocated to preferred shareholders	26	13	50	37
Comprehensive income available to common shareholders	$ 259	$ 191	$ 677	$ 867