Derivatives (Details) (Cash flow hedge, USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		1 Months Ended		1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Foreign currency forward/option contracts	Jun. 30, 2012 Foreign currency forward/option contracts	Jun. 30, 2013 Foreign currency forward/option contracts	Jun. 30, 2012 Foreign currency forward/option contracts	Jun. 30, 2013 Foreign currency forward/option contracts Cost of Sales	Jun. 30, 2012 Foreign currency forward/option contracts Cost of Sales	Jun. 30, 2013 Foreign currency forward/option contracts Cost of Sales	Jun. 30, 2012 Foreign currency forward/option contracts Cost of Sales	Jun. 30, 2013 Foreign currency forward contracts	Jun. 30, 2012 Foreign currency forward contracts	Jun. 30, 2013 Foreign currency forward contracts	Jun. 30, 2012 Foreign currency forward contracts	Jun. 30, 2013 Foreign currency forward contracts Interest expense	Jun. 30, 2012 Foreign currency forward contracts Interest expense	Jun. 30, 2013 Foreign currency forward contracts Interest expense	Jun. 30, 2012 Foreign currency forward contracts Interest expense	Jun. 30, 2013 Commodity price swap contracts	Jun. 30, 2012 Commodity price swap contracts	Jun. 30, 2013 Commodity price swap contracts	Jun. 30, 2012 Commodity price swap contracts	Jun. 30, 2013 Commodity price swap contracts Cost of Sales	Jun. 30, 2012 Commodity price swap contracts Cost of Sales	Jun. 30, 2013 Commodity price swap contracts Cost of Sales	Jun. 30, 2012 Commodity price swap contracts Cost of Sales	Aug. 31, 2011 Interest rate swap contracts	Jun. 30, 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					$ 6,400,000,000		$ 6,400,000,000
Dollar equivalent gross notional amount, natural gas commodity price swaps designated as cash flow hedges																					20,000,000		20,000,000
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	(42,000,000)	29,000,000	(112,000,000)	1,000,000	10,000,000	42,000,000	41,000,000	18,000,000					(49,000,000)	(13,000,000)	(152,000,000)	(12,000,000)					(3,000,000)	0	(1,000,000)	(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	(54,000,000)	(8,000,000)	(162,000,000)	(12,000,000)					(3,000,000)	9,000,000	(9,000,000)	9,000,000					(52,000,000)	(13,000,000)	(153,000,000)	(13,000,000)					1,000,000	(4,000,000)	0	(8,000,000)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges	9,000,000		9,000,000																										(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					$ 0	$ 0	$ 0	$ 0					$ 0	$ 0	$ 0	$ 0
Term of debt instrument																															5 years
Term of interest rate swap																													5 years