Restructuring and Related Implementation Charges - Restructuring Activity and Related Accruals (Details) - Global Growth and Efficiency Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 69		$ 100
Charges	0	$ 42	0	$ 71
Cash payments	(5)		(35)
Charges against assets	0		0
Foreign exchange	0		(1)
Other	0		0
Ending Balance	64		64
Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	10		26
Charges	0		0
Cash payments	(4)		(19)
Charges against assets	0		0
Foreign exchange	0		(1)
Other	0		0
Ending Balance	6		6
Incremental Depreciation
Restructuring Reserve [Roll Forward]
Beginning Balance	0		0
Charges	0		0
Cash payments	0		0
Charges against assets	0		0
Foreign exchange	0		0
Other	0		0
Ending Balance	0		0
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning Balance	0		0
Charges	0		0
Cash payments	0		0
Charges against assets	0		0
Foreign exchange	0		0
Other	0		0
Ending Balance	0		0
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	59		74
Charges	0		0
Cash payments	(1)		(16)
Charges against assets	0		0
Foreign exchange	0		0
Other	0		0
Ending Balance	$ 58		$ 58