Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 52	$ 74
Other comprehensive income, net of income taxes:
Interest rate derivatives	7	3
Other comprehensive income, net of income taxes	7	3
Comprehensive income	$ 59	$ 77