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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets $ 142 $ 78
Fair value of hedge liabilities 208 37
Derivative asset, current 89 54
Derivative asset, noncurrent 53 24
Derivative liability, current 81 35
Derivative liability, noncurrent 127 2
Derivative asset 142 78
Derivative liability 208 37
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets 84 39
Fair value of hedge liabilities 158 21
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 3,113 1,813
Fair value of hedge assets 55 32
Fair value of hedge liabilities $ 157 $ 10
Maximum term of foreign exchange forwards/options, in months 56 months 58 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 269 $ 299
Fair value of hedge assets 29 7
Fair value of hedge liabilities $ 1 $ 11
Maximum term of commodity swaps/options, in months 36 months 36 months
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets $ 58 $ 39
Fair value of hedge liabilities 50 16
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 3,390 3,262
Fair value of hedge assets 58 39
Fair value of hedge liabilities $ 50 $ 16
Maximum term of foreign exchange forwards/options, in months 33 months 35 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 1 $ 2
Fair value of hedge assets 0 0
Fair value of hedge liabilities $ 0 $ 0
Maximum term of commodity swaps/options, in months 5 months 2 months