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Financial Instruments (Notional Amounts of Derivatives) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivative [Line Items]    
Derivative notional amounts $ 173 $ 422
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member]    
Derivative [Line Items]    
Derivative notional amounts 9,782 9,896
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivative [Line Items]    
Derivative notional amounts $ 6 $ 7