Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 60	$ (186)
Other comprehensive income, net of tax	11	86
Comprehensive income (loss)	$ 71	$ (100)