Restructuring (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring accrual
Beginning balance, restructuring reserve	$ 44	$ 47	$ 45	$ 45
Charges	12	5	20	72
Write-down of assets to net realizable value	(1)	(3)	(1)	(43)
Net cash paid, principally severance and related benefits	(5)	(10)	(14)	(32)
Other, including foreign exchange translation		(4)		(7)
Ending balance, restructuring reserve	50	35	50	35
Restructuring, Additional Information
Carrying value of impaired assets	1		1
Employee Costs
Restructuring accrual
Beginning balance, restructuring reserve	32	30	38	32
Charges		2	2	23
Net cash paid, principally severance and related benefits	(4)	(10)	(11)	(31)
Other, including foreign exchange translation			(1)	(2)
Ending balance, restructuring reserve	28	22	28	22
Asset Impairment
Restructuring accrual
Charges	1	3	1	43
Write-down of assets to net realizable value	(1)	(3)	(1)	(43)
Other Exit Costs
Restructuring accrual
Beginning balance, restructuring reserve	12	17	7	13
Charges	11		17	6
Net cash paid, principally severance and related benefits	(1)		(3)	(1)
Other, including foreign exchange translation		(4)	1	(5)
Ending balance, restructuring reserve	$ 22	$ 13	$ 22	$ 13