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Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair value of commodity contracts    
Fair value of derivative instruments, Assets $ 24 $ 14
Fair value of derivative instruments, Liabilities 26 31
Commodity and foreign currency contracts | Accounts Receivable, Net    
Fair value of commodity contracts    
Fair value of derivative instruments, Assets 22 11
Commodity and foreign currency contracts | Accounts Payable and Accrued Liabilities    
Fair value of commodity contracts    
Fair value of derivative instruments, Liabilities 18 23
Commodity, foreign currency, and interest rate contracts | Other Assets    
Fair value of commodity contracts    
Fair value of derivative instruments, Assets 2 3
Commodity, foreign currency, and interest rate contracts | Non Current Liabilities    
Fair value of commodity contracts    
Fair value of derivative instruments, Liabilities $ 8 $ 8