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Derivatives (Details) (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
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Cash flow hedge
Jun. 30, 2011
Cash flow hedge
Jun. 30, 2012
Cash flow hedge
Jun. 30, 2011
Cash flow hedge
Jun. 30, 2012
Cash flow hedge
Foreign currency forward/option contracts
Jun. 30, 2011
Cash flow hedge
Foreign currency forward/option contracts
Jun. 30, 2012
Cash flow hedge
Foreign currency forward/option contracts
Jun. 30, 2011
Cash flow hedge
Foreign currency forward/option contracts
Jun. 30, 2012
Cash flow hedge
Foreign currency forward/option contracts
Cost of Sales
Jun. 30, 2011
Cash flow hedge
Foreign currency forward/option contracts
Cost of Sales
Jun. 30, 2012
Cash flow hedge
Foreign currency forward/option contracts
Cost of Sales
Jun. 30, 2011
Cash flow hedge
Foreign currency forward/option contracts
Cost of Sales
Jun. 30, 2012
Cash flow hedge
Foreign currency forward contracts
Jun. 30, 2011
Cash flow hedge
Foreign currency forward contracts
Jun. 30, 2012
Cash flow hedge
Foreign currency forward contracts
Jun. 30, 2011
Cash flow hedge
Foreign currency forward contracts
Jun. 30, 2012
Cash flow hedge
Foreign currency forward contracts
Interest expense
Jun. 30, 2011
Cash flow hedge
Foreign currency forward contracts
Interest expense
Jun. 30, 2012
Cash flow hedge
Foreign currency forward contracts
Interest expense
Jun. 30, 2011
Cash flow hedge
Foreign currency forward contracts
Interest expense
Jun. 30, 2012
Cash flow hedge
Commodity price swap contracts
Jun. 30, 2011
Cash flow hedge
Commodity price swap contracts
Jun. 30, 2012
Cash flow hedge
Commodity price swap contracts
Jun. 30, 2011
Cash flow hedge
Commodity price swap contracts
Jun. 30, 2012
Cash flow hedge
Commodity price swap contracts
Cost of Sales
Jun. 30, 2011
Cash flow hedge
Commodity price swap contracts
Cost of Sales
Jun. 30, 2012
Cash flow hedge
Commodity price swap contracts
Cost of Sales
Jun. 30, 2011
Cash flow hedge
Commodity price swap contracts
Cost of Sales
Aug. 31, 2011
Cash flow hedge
Interest rate swap contracts
Aug. 31, 2011
Cash flow hedge
Interest rate swap contracts
Fixed rate Medium-term note due 2016
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Derivatives in Cash Flow Hedging Relationships                                                                
Maximum length of time hedged (in months)             12 months                               12 months                  
Dollar equivalent gross notional amount, foreign exchange forward and option contracts designated as cash flow hedges             $ 5,900,000,000   $ 5,900,000,000                                              
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     29,000,000 (35,000,000) 1,000,000 (62,000,000) 42,000,000 (27,000,000) 18,000,000 (61,000,000)         (13,000,000) (7,000,000) (12,000,000) 1,000,000         0 (1,000,000) (5,000,000) (2,000,000)         (7,000,000)  
Pretax Gain (Loss) Recognized in Income on Effective Portion of Derivative as a Result of Reclassification from Accumulated Other Comprehensive Income     (8,000,000) (36,000,000) (12,000,000) (36,000,000)         9,000,000 (28,000,000) 9,000,000 (34,000,000)         (13,000,000) (8,000,000) (13,000,000) 2,000,000         (4,000,000) 0 (8,000,000) (4,000,000)    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges 30,000,000 22,000,000                                                         (4,000,000)  
The time period estimated for the anticipated transfer of gains (losses), net from accumulated other comprehensive income into earnings (in months or years)     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    
Debt Instrument Term                                                               5
Term of interest rate swap (in years)                                                             5 years