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Derivative Instruments and Hedging Activities (Narrative) (Details) (Designated As Hedging Instrument [Member], USD $)
9 Months Ended
Sep. 30, 2013
Derivative [Line Items]  
After-tax losses in AOCI from commodity cash flow hedge transactions $ 5,000,000
Number of months price risk cash flow hedges gain loss will be recognized in earnings 12 months
Hedged fixed rate long term debt amount 1,700,000,000
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps 21,000,000
Total after-tax gains deferred in AOCI related to treasury-lock agreements and interest rate swaps that will be recognized in earnings 21,000,000
Number of years in which after-tax gains in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, low end of range 10 years
Number of years in which after-tax gains in AOCI related to treasury-lock agreements and interest rate swaps will be recognized in earnings, high end of range 30 years
Corn [Member]
 
Derivative [Line Items]  
Corn processed per month (in bushels) 76,000,000
Historical time period of hedge percentages 12 months
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) 15.00%
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) 25.00%
Number of months for which hedges for future monthly commodity purchases, sales or production have been made 15 months
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) 0.10%
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) 16.00%
Natural gas [Member]
 
Derivative [Line Items]  
Historical time period of hedge percentages 12 months
Natural gas used by production facilities per month (in MMbtus) 3,800,000
Percentage of anticipated commodity purchases or production hedged during historical hedging period, low end of range (as a percent) 11.00%
Percentage of anticipated commodity purchases or production hedged during historical hedging period, high end of range (as a percent) 66.00%
Number of months for which hedges for future monthly commodity purchases, sales or production have been made 6 months
Percentage of anticipated commodity purchases or production hedged over future hedging period, low end of range (as a percent) 4.00%
Percentage of anticipated commodity purchases or production hedged over future hedging period, high end of range (as a percent) 20.00%
Ethanol [Member]
 
Derivative [Line Items]  
Number of months for which hedges for future monthly commodity purchases, sales or production have been made 9 months
Derivative Hedged Item Past Period of Time Hedged Volumes 12 months
Commodity sales volume hedged during historical hedging period, low end of range (in gallons) 1,000,000
Commodity sales volume hedged during historical hedging period, high end of range (in gallons) 13,000,000
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
Foreign Currency Exchange [Member]
 
Derivative [Line Items]  
Historical time period of hedged amounts 12 months
Foreign currency expenditures hedged during historical hedging period, low end of range 13,000,000
Foreign currency expenditures hedged during historical hedging period, high end of range 19,000,000
Foreign currency expenditures hedged 13,000,000
Gain on Foreign Exchange Contracts, Cash Flow Hedges, after Tax, Accumulated Other Comprehensive Income 300,000
Gain on Foreign Exchange Contracts, Cash Flow Hedges After Tax Reclassification to Earnings $ 300,000