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Derivative Instruments and Hedging Activities (Narrative) (Details)
€ in Millions, gal in Millions, bu in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
bu
gal
Mar. 31, 2019
EUR (€)
gal
Dec. 31, 2018
USD ($)
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 $ 31        
Corn processed per month (in bushels) | bu 72        
Debt Instrument, Interest Rate, Stated Percentage       1.00%  
Designated As Hedging Instrument [Member]          
Derivative [Line Items]          
Unrealized Gain (Loss) on Price Risk Cash Flow Hedges, after Tax, Accumulated Other Comprehensive Income $ 10        
Interest Rate Derivative Liabilities, at Fair Value 32   $ 20    
After-tax gains (losses) in AOCI from commodity cash flow hedge transactions 10        
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        
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%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 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%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 50.00% 50.00%      
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 2 2      
Commodity hedged over future hedging period, (in gallons) | gal 1 1      
Ethanol [Member] | Maximum [Member] | Designated As Hedging Instrument [Member]          
Derivative [Line Items]          
Commodity hedged during historical hedging period, (in gallons) | gal 121 121      
Commodity hedged over future hedging period, (in gallons) | gal 42 42      
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%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 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%      
Percentage of anticipated commodity purchases or production hedged over future hedging period (as a percent) 100.00% 100.00%      
Foreign Exchange Contracts [Member]          
Derivative [Line Items]          
Debt amount designated as a net investment hedge | €   € 1,750      
Derivatives used in Net Investment Hedge, Net of Tax $ 3   $ (26)    
Fair Value Hedging [Member] | Designated As Hedging Instrument [Member]          
Derivative [Line Items]          
Interest Rate Derivative Liabilities, at Fair Value $ 1