Restructuring and Related Implementation Charges (Details 4) - 2012 Restructuring Program - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 167		$ 181
Charges	142	$ 59	188	$ 114
Cash payments	(54)		(109)
Charges against assets	(5)		(10)
Foreign exchange	4		4
Ending Balance	254		254
Employee-Related Costs
Restructuring Reserve [Roll Forward]
Beginning Balance	44		56
Charges	100		108
Cash payments	(8)		(27)
Charges against assets	(1)		(2)
Foreign exchange	3		3
Ending Balance	138		138
Incremental Depreciation
Restructuring Reserve [Roll Forward]
Beginning Balance	0		0
Charges	4		6
Cash payments	0		0
Charges against assets	(4)		(6)
Foreign exchange	0		0
Ending Balance	0		0
Asset Impairments
Restructuring Reserve [Roll Forward]
Beginning Balance	0		0
Charges	0		2
Cash payments	0		0
Charges against assets	0		(2)
Foreign exchange	0		0
Ending Balance	0		0
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	123		125
Charges	38		72
Cash payments	(46)		(82)
Charges against assets	0		0
Foreign exchange	1		1
Ending Balance	116		116
Third party Incremental Cost
Restructuring Reserve [Roll Forward]
Charges	37		70
Contract Termination
Restructuring Reserve [Roll Forward]
Charges	$ 1		$ 2