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Hedges and Derivative Financial Instruments - Schedule of Outstanding Derivative Contracts (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 59 $ 54
Fair value of hedged liabilities 80 96
Derivative asset at fair value, current 53 54
Derivative asset at fair value, noncurrent 6 0
Total derivatives, hedge assets at fair value 59 54
Derivative liability at fair value, current 75 79
Derivative liability at fair value, noncurrent 5 17
Total derivatives, hedge liabilities at fair value 80 96
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets 40 32
Fair value of hedged liabilities 47 74
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 955 886
Fair value of hedged assets 26 31
Fair value of hedged liabilities $ 21 $ 8
Maximum term of foreign exchange forwards/options 13 months 12 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 306 $ 322
Fair value of hedged assets 14 1
Fair value of hedged liabilities $ 26 $ 66
Maximum term of commodity swaps/options 33 months 33 months
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 19 $ 22
Fair value of hedged liabilities 33 22
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 2,028 2,886
Fair value of hedged assets 19 22
Fair value of hedged liabilities $ 33 $ 21
Maximum term of foreign exchange forwards/options 11 months 11 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 1 $ 7
Fair value of hedged assets 0 0
Fair value of hedged liabilities $ 0 $ 1
Maximum term of commodity swaps/options 8 months 6 months