Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 14	$ 85	$ (25)	$ 343
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments			(1)	(49)
Reclassification of currency translation adjustment to gain on disposal of discontinued operations				(64)
Unrealized gain (loss) on interest rate swaps	3	7	13	(8)
Gain on pension and other postretirement benefit plans	1		3	1
Other comprehensive income (loss), net of tax	4	7	15	(120)
Comprehensive income (loss), net of tax	$ 18	$ 92	$ (10)	$ 223