Condensed Statements of Consolidated Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 202	$ 218	$ 923	$ 832
Other comprehensive income:
Adjustment to pension and other postretirement plans (net of tax expense (benefit) of $(9), $1, $(5) and $2)	2	4	(20)	7
Reclassification of deferred loss from cash flow hedges realized in net income (net of tax of $-0-, $-0-, $-0- and $-0-)	0	1	1	1
Other comprehensive income from unconsolidated affiliates (net of tax of $-0-, $-0-, $-0- and $-0-)	0	0	0	2
Total	2	5	(19)	10
Comprehensive income (loss)	204	223	904	842
Income allocated to preferred shareholders	13	23	37	82
Comprehensive income available to common shareholders	$ 191	$ 200	$ 867	$ 760