Restructuring Restructuring Liability (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Beginning Balance			$ 131	$ 97
Restructuring	$ 154	$ 108	328	177	$ 140
Payments made during the period			(255)	(133)
Foreign currency and other			(6)	(10)
Ending Balance		131	198	131	97
Employee Termination Benefits Liability
Restructuring Reserve [Roll Forward]
Beginning Balance			129	95
Restructuring			322	175
Payments made during the period			(252)	(131)
Foreign currency and other			(6)	(10)
Ending Balance		129	193	129	95
Other Exit Costs Liability
Restructuring Reserve [Roll Forward]
Beginning Balance			2	2
Restructuring			6	2
Payments made during the period			(3)	(2)
Foreign currency and other			0	0
Ending Balance		$ 2	$ 5	$ 2	$ 2