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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, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 58 $ 65
Fair value of hedged liabilities 88 66
Derivative asset at fair value, current 56 64
Derivative asset at fair value, noncurrent 2 1
Total derivatives, hedge assets at fair value 58 65
Derivative liability at fair value, current 77 59
Derivative liability at fair value, noncurrent 11 7
Total derivatives, hedge liabilities at fair value 88 66
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets 34 31
Fair value of hedged liabilities 67 37
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 1,123 874
Fair value of hedged assets 31 27
Fair value of hedged liabilities $ 28 $ 8
Maximum term of foreign exchange forwards/options 18 months 17 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 335 $ 375
Fair value of hedged assets 3 4
Fair value of hedged liabilities $ 39 $ 29
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 $ 24 $ 34
Fair value of hedged liabilities 21 29
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 2,328 2,358
Fair value of hedged assets 24 34
Fair value of hedged liabilities $ 21 $ 29
Maximum term of foreign exchange forwards/options 11 months 10 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 8 $ 8
Fair value of hedged assets 0 0
Fair value of hedged liabilities $ 0 $ 0
Maximum term of commodity swaps/options 11 months 4 months