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Inventories, Derivative Instruments & Hedging Activities (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2010
Inventories, Derivative Instruments & Hedging Activities        
After-tax gains (losses) in AOCI from commodity cash flow hedge transactions   $ 1    
Gain (loss) expected to be recognized in next twelve months   1    
Number of months cash flow hedge gains (losses) will be recognized in earnings (in months)   12 months    
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps   21   21
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps   22    
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings   22    
Number of years in which after-tax gains (losses) in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, low end of range (in years)   10 Years    
Number of years in which after-tax gains (losses) in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, high end of range (in years)   30 Years    
Fair value of derivatives designated as hedging instrument        
Interest Contracts Assets 0   0  
Commodity Contracts Assets 2 1 2  
Total fair value of derivatives assets designated as hedging instrument 2 1 2  
Interest Contracts Liabilities 0   0  
Commodity Contracts Liabilities 2 1 2  
Total fair value of derivatives liabilities designated as hedging instrument 2 1 2  
Pre-tax gains (losses) on derivatives designated as hedging instruments        
Pre-tax gains (losses) recognized in earnings from interest rate swaps that have been de-designated (59) 30 (59)  
Total amount recognized in earnings   409 (141)  
Cash flow hedge gains (losses) that will be recognized in earnings   2    
After-tax gains in AOCI related to foreign exchange contracts designated as cash flow hedging instruments   2    
Interest expense | Not designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Interest contracts   0 0  
Interest expense | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives designated as hedging instruments        
Pre-tax gains (losses) recognized in earnings from interest rate swaps that have been de-designated   0 0  
Interest contracts ineffective amount recognized in earnings   1    
Net sales and other operating income | Not designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
FX Contracts   (14) 0  
Net sales and other operating income | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives designated as hedging instruments        
Commodity contracts effective amount recognized in earnings   (13) 0  
Cost of products sold | Not designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
FX Contracts   150 61  
Commodity contracts   (1,303) 242  
Cost of products sold | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives designated as hedging instruments        
Commodity contracts effective amount recognized in earnings   375 (85)  
Commodity contracts ineffective amount recognized in earnings   46 (55)  
Other income (expense) - net | Not designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Interest contracts   30 (57)  
FX Contracts   43 (42)  
Other income (expense) - net | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives designated as hedging instruments        
FX Contracts Effective amount recognized in earnings   0 (1)  
Corn
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Corn processed per month (in bushels)   75,000,000    
Historical time period of hedge percentages (in months)   12    
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent)   1.00%    
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent)   100.00%    
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months)   6    
Corn | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent)   1.00%    
Natural Gas
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Natural gas used by production facilities per month (in MMbtus)   3,800,000    
Historical time period of hedge percentages (in months)   12    
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent)   48.00%    
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent)   58.00%    
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months)   12    
Natural Gas | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent)   13.00%    
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent)   37.00%    
Ethanol
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Number of months for which hedges for future monthly commodity purchases, sales or production have been made (in months)   9    
Historical time period of hedge volumes (in months)   12    
Commodity sales volume hedged during historical hedging period, low end of range (in gallons)   7,000,000    
Commodity sales volume hedged during historical hedging period, high end of range (in gallons)   17,000,000    
Ethanol | Designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Contracted commodity sales volume hedged over future hedging period, low end of range (in gallons)   1,000,000    
Contracted commodity sales volume hedged over future hedging period, high end of range (in gallons)   14,000,000    
Not designated as hedging instrument
       
Pre-tax gains (losses) on derivatives not designated as hedging instruments        
Total gain (loss) recognized in earnings   $ (1,094) $ 204