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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 61 $ 65
Fair value of hedged liabilities 99 66
Derivative asset at fair value, current 61 64
Derivative asset at fair value, noncurrent 0 1
Total derivatives, hedge assets at fair value 61 65
Derivative liability at fair value, current 82 59
Derivative liability at fair value, noncurrent 17 7
Total derivatives, hedge liabilities at fair value 99 66
Derivatives accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets 35 31
Fair value of hedged liabilities 77 37
Derivatives accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 943 874
Fair value of hedged assets 35 27
Fair value of hedged liabilities $ 13 $ 8
Maximum term of foreign exchange forwards/options 15 months 17 months
Derivatives accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 333 $ 375
Fair value of hedged assets 0 4
Fair value of hedged liabilities $ 64 $ 29
Maximum term of commodity swaps/options 35 months 36 months
Derivatives not accounted for as hedges    
Derivatives, Fair Value [Line Items]    
Fair value of hedged assets $ 26 $ 34
Fair value of hedged liabilities 22 29
Derivatives not accounted for as hedges | Foreign exchange forwards/options    
Derivatives, Fair Value [Line Items]    
Notional Amount 2,410 2,358
Fair value of hedged assets 26 34
Fair value of hedged liabilities $ 22 $ 29
Maximum term of foreign exchange forwards/options 8 months 10 months
Derivatives not accounted for as hedges | Commodity swaps/options    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 5 $ 8
Fair value of hedged assets 0 0
Fair value of hedged liabilities $ 0 $ 0
Maximum term of commodity swaps/options 8 months 4 months