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Financial Instruments, Derivatives and Hedging Activities Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gains or losses on derivatives        
Amount of Gains (Losses) Recognized in OCI on Derivatives $ 4 $ 20 $ 12 $ 2
Amount of Gains (Losses) Reclassified from AOCI into Income 2 (12) (2) (22)
Cost of Sales        
Gains or losses on derivatives        
Amount of Gains (Losses) Reclassified from AOCI into Income 2 (11) (1) (20)
Gross Profit        
Gains or losses on derivatives        
Amount of Gains (Losses) Reclassified from AOCI into Income       (1)
Financing Costs, Net        
Gains or losses on derivatives        
Amount of Gains (Losses) Reclassified from AOCI into Income   (1) (1) (1)
Commodity Contracts        
Gains or losses on derivatives        
Amount of Gains (Losses) Recognized in OCI on Derivatives 4 $ 20 11 $ 2
Foreign Currency Contracts        
Gains or losses on derivatives        
Amount of Gains (Losses) Recognized in OCI on Derivatives     1  
Cash Flow Hedging | Commodity Contracts        
Gains or losses on derivatives        
Gains expected to be reclassified into earnings during the next 12 months on commodity hedging contracts, net of tax 7   7  
Gains expected to be reclassified into earnings during the next 12 months on commodity hedging contracts, income tax effect (2)   (2)  
Cash Flow Hedging | Treasury Lock        
Gains or losses on derivatives        
Losses expected to be reclassified into earnings during next twelve months on settled Treasury Lock Agreements, net of tax 1   1  
Losses expected to be reclassified into earnings during the next twelve months on settled Treasury Lock Agreements, income tax effect $ (1)   $ (1)