Equity (Details 7) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales	$ (5,197)	$ (5,294)	$ (5,093)
Financing costs, net	(66)	(67)	(78)
Income before income taxes	547	601	593
Income tax (expense) benefit	(144)	(167)	(170)
Net income	403	434	423
Gains (losses) on cash-flow hedges | Reclassification from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Income before income taxes	(68)	33	182
Income tax (expense) benefit	22	(13)	(66)
Net income	(46)	20	116
Gains (losses) on cash-flow hedges | Reclassification from Accumulated Other Comprehensive Income | Commodity and foreign currency contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Cost of sales	(57)	43	169
Gains (losses) on cash-flow hedges | Reclassification from Accumulated Other Comprehensive Income | Interest rate contracts
Amount Reclassified from Accumulated Other Comprehensive Income
Financing costs, net	(3)	(3)	(3)
Pension and other postretirement obligations | Reclassification from Accumulated Other Comprehensive Income
Amount Reclassified from Accumulated Other Comprehensive Income
Gains (losses) related to pension and other postretirement obligations	$ (8)	$ (7)	$ 16