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Financial Instruments, Derivatives and Hedging Activities Contracts (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gains or losses on derivatives    
Amount of Gains (Losses) Recognized in OCI on Derivatives $ (17) $ (20)
Amount of Gains (Losses) Reclassified from AOCI into Income (10) (14)
Cost of Sales    
Gains or losses on derivatives    
Amount of Gains (Losses) Reclassified from AOCI into Income (10) (13)
Financing Costs, Net    
Gains or losses on derivatives    
Amount of Gains (Losses) Reclassified from AOCI into Income   (1)
Commodity and Foreign Currency Contracts    
Gains or losses on derivatives    
Amount of Gains (Losses) Recognized in OCI on Derivatives (17) $ (20)
Cash Flow Hedging | Commodity Contract    
Gains or losses on derivatives    
Losses expected to be reclassified into earnings during the next 12 months on commodity hedging contracts, net of tax (27)  
Losses expected to be reclassified into earnings during the next 12 months on commodity hedging contracts, income tax effect 14  
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)  
Losses expected to be reclassified into earnings during the next twelve months on settled Treasury Lock Agreements, income tax effect $ 1