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Financial Instruments, Derivatives and Hedging Activities - Commodity price hedging (Details)
bu in Millions, MMBTU in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
MMBTU
bu
Dec. 31, 2018
USD ($)
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,158) $ (1,154)
Commodity Contracts    
Financial instruments, derivatives and hedging activities    
Tax effect on gains (losses) of derivative instruments $ 5 2
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 98  
Natural Gas Commodity    
Financial instruments, derivatives and hedging activities    
Natural gas futures contract (in mmbtu) | MMBTU 30  
Cash Flow Hedging    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (9) (4)
Cash Flow Hedging | Commodity Contracts    
Financial instruments, derivatives and hedging activities    
Accumulated gains (losses) from derivative instruments, net of tax effect $ (11) $ (2)