Asset Impairment and Exit Costs (Movement in the Exit Cost Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
Liability, beginning balance	$ 54	$ 270
Charges, net	0	68
Cash spent	(31)	(232)	$ (360)
Currency/other	(4)	(52)
Liability, ending balance	$ 19	$ 54	$ 270