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Derivative and Other Financial Instruments (Notional Values of Outstanding Derivative Instruments in the Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 572 $ 618
Foreign Exchange [Member] | Cash Flow Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 651 644
Foreign Exchange [Member] | Fair Value Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 59 73
Commodities [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 78 72
Commodities [Member] | Cash Flow Hedges [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 205 $ 180