Condensed Statements Of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Condensed Statements Of Consolidated Comprehensive Income [Abstract]
Net income	$ 194	$ 168
Other comprehensive income:
Net effects of cash flow hedges (net of tax)	1	1
Defined benefit pension plans (net of tax)	1	1
Total other comprehensive income	2	2
Comprehensive income	$ 196	$ 170