Other Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Non-service related net periodic benefit cost	$ 2	$ 8	$ 8	$ 19
Interest income	(1)	(1)	(2)	(5)
Foreign currency (gains) losses, net	(2)	(5)	1	(12)
Net loss from asset sales	3	2	7	6
Deferred compensation	(1)	4	5	1
Other, net	0	0	(6)	(9)
Other expense, net	$ 1	$ 8	$ 13	$ 0