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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative asset, current $ 54 $ 64
Derivative asset, noncurrent 0 1
Total derivatives, hedge assets at fair value 54 65
Derivative liability, current 79 59
Derivative liability, noncurrent 17 7
Total derivatives, hedge liabilities at fair value 96 66
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets 32 31
Fair value of hedge liabilities 74 37
Designated as Hedging Instrument | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Notional Amount 886 874
Fair value of hedge assets 31 27
Fair value of hedge liabilities $ 8 $ 8
Maximum term of foreign exchange forwards/options, in months 12 months 17 months
Designated as Hedging Instrument | Commodity Contract    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 322 $ 375
Fair value of hedge assets 1 4
Fair value of hedge liabilities $ 66 $ 29
Maximum term of commodity swaps/options, in months 33 months 36 months
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Fair value of hedge assets $ 22 $ 34
Fair value of hedge liabilities 22 29
Not Designated as Hedging Instrument | Foreign Exchange Contract    
Derivatives, Fair Value [Line Items]    
Notional Amount 2,886 2,358
Fair value of hedge assets 22 34
Fair value of hedge liabilities $ 21 $ 29
Maximum term of foreign exchange forwards/options, in months 11 months 10 months
Not Designated as Hedging Instrument | Commodity Contract    
Derivatives, Fair Value [Line Items]    
Notional Amount $ 7 $ 8
Fair value of hedge assets 0 0
Fair value of hedge liabilities $ 1 $ 0
Maximum term of commodity swaps/options, in months 6 months 4 months