Costs Associated with Rationalization Programs - Roll-Forward of Liability Balance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve
Beginning Balance	$ 219	$ 103	$ 119
New Charges	135	218	116
Incurred, Net of Foreign Currency Translation	(128)	(93)	(131)
Reversed to the Statement of Operations	(13)	(9)	(1)
Ending Balance	213	219	103
Rationalizations	135	210	114
Payments for legal settlements		6	25
Associate-related Costs
Restructuring Reserve
Beginning Balance	214	96	117
New Charges	103	202	86
Incurred, Net of Foreign Currency Translation	(94)	(75)	(106)
Reversed to the Statement of Operations	(13)	(9)	(1)
Ending Balance	210	214	96
Foreign currency translation	25	(13)	(12)
Other Costs
Restructuring Reserve
Beginning Balance	5	7	2
New Charges	32	16	30
Incurred, Net of Foreign Currency Translation	(34)	(18)	(25)
Reversed to the Statement of Operations	0	0	0
Ending Balance	3	5	7
Foreign currency translation	1	0	0
Benefit Plan Curtailments and Settlements
Restructuring Reserve
Rationalizations	$ 13	$ 1	$ (1)