Restructuring Actions - Roll Forward (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2015	Jun. 30, 2016
Restructuring Reserve [Roll Forward]
Restructuring action balances, Beginning Balance		$ 63
Expenses incurred	$ 114
Non-cash changes	(24)
Cash payments	(27)	(35)
Restructuring action balances, Ending Balance	63	28
Employee-Related
Restructuring Reserve [Roll Forward]
Restructuring action balances, Beginning Balance		63
Expenses incurred	98
Non-cash changes	(8)
Cash payments	(27)	(35)
Restructuring action balances, Ending Balance	63	$ 28
Asset-Related
Restructuring Reserve [Roll Forward]
Expenses incurred	16
Non-cash changes	$ (16)