Derivatives (Details) (Cash flow hedge, USD $) In Millions, unless otherwise specified	3 Months Ended												1 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Foreign currency forward/option contracts	Mar. 31, 2013 Foreign currency forward/option contracts	Mar. 31, 2014 Foreign currency forward/option contracts Cost of Sales	Mar. 31, 2013 Foreign currency forward/option contracts Cost of Sales	Mar. 31, 2013 Foreign currency forward contracts	Mar. 31, 2013 Foreign currency forward contracts Interest expense	Mar. 31, 2014 Commodity price swap contracts	Mar. 31, 2013 Commodity price swap contracts	Mar. 31, 2014 Commodity price swap contracts Cost of Sales	Mar. 31, 2013 Commodity price swap contracts Cost of Sales	Aug. 31, 2011 Interest rate swap contracts	Mar. 31, 2014 Interest rate swap contracts	Aug. 31, 2011 Interest rate swap contracts Fixed rate Medium-term note due 2016
Derivatives in Cash Flow Hedging Relationships
Maximum length of time hedged in cash flow hedge			12 months						12 months
Derivative notional amount			$ 1,600						$ 20				$ 400
Principal amount															1,000
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative	9	(35)	7	31			(68)		2	2			(7)
Gain (Loss) on Hedged Item Recognized in Income	6	(73)			4	(6)		(66)			2	(1)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	(6)												(4)	(2)
The time period estimated for the anticipated transfer of gains (losses), net from accumulated other comprehensive income into earnings														12 months
Ineffective portion of gain (loss) on derivative and amount excluded from effectiveness testing recognized in income	0	0			0	0		0			0	0
Term of debt instrument															5 years
Term of interest rate swap													5 years
Revised Amounts For Cash Flow Hedge Disclosure Years Presented							$ 35