Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales	$ 1,084	$ 1,100	$ 2,185	$ 2,121
Gross profit	(373)	(355)	(725)	(694)
Financing costs-net	20	19	41	33
Reclassification out of Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Gains (losses) related to pension and other postretirement obligations	1	(1)	1	(1)
Total before tax reclassifications	3	(13)	(1)	(23)
Income tax benefit		4	1	7
Total after-tax reclassifications	3	(9)		(16)
Reclassification out of Accumulated Other Comprehensive Income | Commodity Contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales	$ 2	(11)	(1)	(20)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Gross profit				1
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Contract
Amount Reclassified from Accumulated Other Comprehensive Income
Financing costs-net		$ (1)	$ (1)	$ (1)