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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Derivative asset, current $ 54 $ 54
Derivative asset, noncurrent 24 0
Total derivatives, hedge assets at fair value 78 54
Derivative liability, current 35 79
Derivative liability, noncurrent 2 17
Total derivatives, hedge liabilities at fair value 37 96
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets 39 32
Fair value of hedge liabilities 21 74
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 1,813 886
Fair value of hedge assets 32 31
Fair value of hedge liabilities $ 10 $ 8
Maximum term of foreign exchange forwards/options, in months 58 months 12 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 299 $ 322
Fair value of hedge assets 7 1
Fair value of hedge liabilities $ 11 $ 66
Maximum term of commodity swaps/options, in months 36 months 33 months
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets $ 39 $ 22
Fair value of hedge liabilities 16 22
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 3,262 2,886
Fair value of hedge assets 39 22
Fair value of hedge liabilities $ 16 $ 21
Maximum term of foreign exchange forwards/options, in months 35 months 11 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 2 $ 7
Fair value of hedge assets 0 0
Fair value of hedge liabilities $ 0 $ 1
Maximum term of commodity swaps/options, in months 2 months 6 months