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Hedges and Derivative Financial Instruments - Schedule of Outstanding Derivative Contracts (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 47 $ 142
Fair value of hedged liabilities 180 208
Derivative asset at fair value, current 41 89
Derivative asset at fair value, noncurrent 6 53
Total derivatives, hedge assets at fair value 47 142
Derivative liability at fair value, current 55 81
Derivative liability at fair value, noncurrent 125 127
Total derivatives, hedge liabilities at fair value 180 208
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets 27 84
Fair value of hedged liabilities 149 158
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 3,179 3,113
Fair value of hedged assets 13 55
Fair value of hedged liabilities $ 145 $ 157
Maximum term of foreign exchange forwards/options 53 months 56 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 271 $ 269
Fair value of hedged assets 14 29
Fair value of hedged liabilities $ 4 $ 1
Maximum term of commodity swaps/options 33 months 36 months
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 20 $ 58
Fair value of hedged liabilities 31 50
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 3,255 3,390
Fair value of hedged assets 20 58
Fair value of hedged liabilities $ 31 $ 50
Maximum term of foreign exchange forwards/options 30 months 33 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 1 $ 1
Fair value of hedged assets 0 0
Fair value of hedged liabilities $ 0 $ 0
Maximum term of commodity swaps/options 2 months 5 months