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Financial Instruments, Derivatives and Hedging Activities (Details)
lb in Millions, gal in Millions, bu in Millions, MMBTU in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
MMBTU
lb
gal
bu
Dec. 31, 2017
USD ($)
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (972) $ (1,013)
Senior Notes 4.625 Percent Due November 1, 2020    
Financial instruments, derivatives and hedging activities    
Debt, face amount $ 400  
Commodity Contracts | Minimum    
Financial instruments, derivatives and hedging activities    
Maturity period of price risk derivative 12 months  
Commodity Contracts | Maximum    
Financial instruments, derivatives and hedging activities    
Maturity period of price risk derivative 24 months  
Corn Commodity    
Financial instruments, derivatives and hedging activities    
Futures contract (in bushels for corn and gallons for ethanol) | bu 75  
Soy Bean Oil    
Financial instruments, derivatives and hedging activities    
Soybean oil futures contract (in pounds) | lb 3  
Natural Gas Commodity    
Financial instruments, derivatives and hedging activities    
Natural gas futures contract (in mmbtu) | MMBTU 32  
Ethanol Commodity    
Financial instruments, derivatives and hedging activities    
Futures contract (in bushels for corn and gallons for ethanol) | gal 6  
Treasury Lock    
Foreign currency hedging    
Derivative notional amount $ 0 0
Cash Flow Hedging    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect 2 1
Tax effect on gain (loss) on derivative instruments 1 1
Cash Flow Hedging | Commodity Contracts    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect 6 (12)
Tax effect on gain (loss) on derivative instruments   (7)
Cash Flow Hedging | Treasury Lock    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect (2) (2)
Tax effect on gain (loss) on derivative instruments   (1)
Fair Value Hedging | Interest Rate Swap    
Financial instruments, derivatives and hedging activities    
Increase (decrease) in fair value of instrument (2) 1
Fair Value Hedging | Interest Rate Swap | Senior Notes 4.625 Percent Due November 1, 2020    
Financial instruments, derivatives and hedging activities    
Debt, face amount $ 200  
Debt, fixed interest rate (as a percent) 4.625%  
Debt, floating rate of interest basis six-month US dollar LIBOR  
Fair Value Hedging | Foreign Exchange Forward | Short    
Foreign currency hedging    
Derivative notional amount $ 438 447
Fair Value Hedging | Foreign Exchange Forward | Long    
Foreign currency hedging    
Derivative notional amount $ 133 $ 121