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Derivative Instruments and Hedging Activities (Narrative) (Details)
€ in Millions, gal in Millions, bu in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
gal
Jun. 30, 2019
USD ($)
bu
gal
Jun. 30, 2019
EUR (€)
gal
Dec. 31, 2018
USD ($)
Sep. 12, 2018
EUR (€)
Jun. 24, 2015
EUR (€)
Derivative [Line Items]            
Debt Instrument, Face Amount | €         € 650  
Unrealized gain (loss) on interest rate cash flow hedges, after-tax, AOCI $ 46 $ 46        
Corn processed per month (in bushels) | bu   72        
Debt Instrument, Interest Rate, Stated Percentage         1.00%  
Commercial Paper 1,100 $ 1,100        
Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Unrealized Gain (Loss) on Price Risk Cash Flow Hedges, after Tax, Accumulated Other Comprehensive Income 15 15        
Interest Rate Derivative Liabilities, at Fair Value 46 46   $ 20    
After-tax gains (losses) in AOCI from commodity cash flow hedge transactions 15 15        
Floating Rate Notes Euros [Member]            
Derivative [Line Items]            
Debt Instrument, Face Amount | €           € 500
1.75% Notes Euros [Member]            
Derivative [Line Items]            
Debt Instrument, Face Amount | €           € 600
Debt Instrument, Interest Rate, Stated Percentage           1.75%
Fair Value Hedging [Member]            
Derivative [Line Items]            
Derivative Liability, Notional Amount $ 496 $ 496        
Corn [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Derivative Hedged Item Time Period 12 months          
Corn [Member] | Minimum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Percentage of anticipated commodity purchases or production hedged during historical hedging period (as a percent) 19.00% 19.00% 19.00%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 1.00% 1.00% 1.00%      
Corn [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Percentage of anticipated commodity purchases or production hedged during historical hedging period (as a percent) 95.00% 95.00% 95.00%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 32.00% 32.00% 32.00%      
Ethanol [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Derivative Hedged Item Time Period 3 months          
Ethanol [Member] | Minimum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Commodity hedged during historical hedging period, (in gallons) | gal 0 0 0      
Commodity hedged over future hedging period, (in gallons) | gal 0 0 0      
Ethanol [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Commodity hedged during historical hedging period, (in gallons) | gal 121 121 121      
Commodity hedged over future hedging period, (in gallons) | gal 1 1 1      
Soybean [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Derivative Hedged Item Time Period 12 months          
Soybean [Member] | Minimum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Percentage of anticipated commodity purchases or production hedged during historical hedging period (as a percent) 99.00% 99.00% 99.00%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 0.00% 0.00% 0.00%      
Soybean [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Percentage of anticipated commodity purchases or production hedged during historical hedging period (as a percent) 100.00% 100.00% 100.00%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 100.00% 100.00% 100.00%      
Foreign Exchange Contracts [Member]            
Derivative [Line Items]            
Debt amount designated as a net investment hedge | €     € 2,300      
Derivatives used in Net Investment Hedge, Net of Tax $ 25 $ 25   $ (26)    
Fair Value Hedging [Member] | Designated As Hedging Instrument [Member]            
Derivative [Line Items]            
Interest Rate Derivative Liabilities, at Fair Value $ 3 $ 3