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Derivative and Other Financial Instruments (Notional Values of Outstanding Derivative Instruments in the Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives designated as hedges | Derivatives in cash flow hedges | Foreign exchange    
Derivatives, Fair Value [Line Items]    
Derivatives $ 820 $ 864
Derivatives designated as hedges | Derivatives in cash flow hedges | Commodities    
Derivatives, Fair Value [Line Items]    
Derivatives 428 276
Derivatives designated as hedges | Derivatives in fair value hedges | Foreign exchange    
Derivatives, Fair Value [Line Items]    
Derivatives 74 60
Derivatives not designated as hedges | Foreign exchange    
Derivatives, Fair Value [Line Items]    
Derivatives 796 575
Derivatives not designated as hedges | Commodities    
Derivatives, Fair Value [Line Items]    
Derivatives $ 0 $ 40