Derivatives (Details) (Cash flow hedge, USD $)	3 Months Ended														1 Months Ended	3 Months Ended	1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Foreign currency forward/option contracts	Mar. 31, 2012 Foreign currency forward/option contracts	Mar. 31, 2013 Foreign currency forward/option contracts Cost of Sales	Mar. 31, 2012 Foreign currency forward/option contracts Cost of Sales	Mar. 31, 2013 Foreign currency forward contracts	Mar. 31, 2012 Foreign currency forward contracts	Mar. 31, 2013 Foreign currency forward contracts Interest expense	Mar. 31, 2012 Foreign currency forward contracts Interest expense	Mar. 31, 2013 Commodity price swap contracts	Mar. 31, 2012 Commodity price swap contracts	Mar. 31, 2013 Commodity price swap contracts Cost of Sales	Mar. 31, 2012 Commodity price swap contracts Cost of Sales	Aug. 31, 2011 Interest rate swap contracts	Mar. 31, 2013 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
Dollar equivalent gross notional amount, foreign exchange forward and option contracts designated as cash flow hedges			$ 5,900,000,000
Dollar equivalent gross notional amount, natural gas commodity price swaps designated as cash flow hedges											14,000,000
Dollar equivalent gross notional amount, forecasted debt issuance contracts designated as cash flow hedges															400,000,000
Principal amount																	1,000,000,000
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative	(70,000,000)	(28,000,000)	31,000,000	(24,000,000)			(103,000,000)	1,000,000			2,000,000	(5,000,000)			(7,000,000)
Pretax Gain (Loss) Recognized in Income on Effective Portion of Derivative as a Result of Reclassification from Accumulated Other Comprehensive Income	(108,000,000)	(4,000,000)			(6,000,000)	0			(101,000,000)	0			(1,000,000)	(4,000,000)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	1,000,000														(4,000,000)	(3,000,000)
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	$ 0
Term of debt instrument																	5 years
Term of interest rate swap															5 years