Condensed Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 531	$ 363
Other comprehensive income:
Adjustment to pension and other postretirement plans (net of tax of $-0- and $-0-)	1	2
Reclassification of deferred loss from cash flow hedges realized in net income (net of tax of $-0- and $-0-)	1	0
Other comprehensive income from unconsolidated affiliates (net of tax of $-0- and $-0-)	0	1
Total	2	3
Comprehensive income	533	366
Income allocated to preferred shareholders	13	29
Comprehensive income available to common shareholders	$ 520	$ 337