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Financial Instruments, Derivatives and Hedging Activities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2014
Financial instruments, derivatives and hedging activities      
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,029) $ (1,071)  
Carrying amount of fair value adjustment related to hedged fixed rate instrument debt instrument $ 4 3  
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    
Treasury Lock      
Foreign currency hedging      
Derivative notional amount $ 0 0  
Cash Flow Hedging | Commodity Contracts      
Financial instruments, derivatives and hedging activities      
Accumulated gains (losses) from derivative instruments, net of tax effect 7    
Accumulated gains (losses) from derivative instruments, net income tax effect (2)    
Cash Flow Hedging | Treasury Lock      
Financial instruments, derivatives and hedging activities      
Accumulated gains (losses) from derivative instruments, net of tax effect (3) (4)  
Accumulated gains (losses) from derivative instruments, net income tax effect 2 2  
Cash Flow Hedging | Foreign Exchange Forward      
Financial instruments, derivatives and hedging activities      
Accumulated gains (losses) from derivative instruments, net of tax effect (2) (3)  
Fair Value Hedging | Interest Rate Swap      
Financial instruments, derivatives and hedging activities      
Fair value of interest rate derivatives $ 4 3  
Fair Value Hedging | Interest Rate Swap | Senior Notes 1.8 Percent Due September 25, 2017      
Financial instruments, derivatives and hedging activities      
Debt, fixed interest rate (as a percent) 1.80%    
Debt, face amount $ 300    
Debt, floating rate of interest basis six-month US dollar LIBOR    
Fair Value Hedging | Interest Rate Swap | Senior Notes 4.625 Percent Due November 1, 2020      
Financial instruments, derivatives and hedging activities      
Debt, fixed interest rate (as a percent) 4.625%    
Debt, face amount $ 200    
Debt, floating rate of interest basis six-month US dollar LIBOR    
Fair Value Hedging | Foreign Exchange Forward | Short      
Foreign currency hedging      
Derivative notional amount $ 464 432  
Fair Value Hedging | Foreign Exchange Forward | Long      
Foreign currency hedging      
Derivative notional amount $ 227 $ 227