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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative asset, current $ 27 $ 26
Derivative asset, noncurrent 3 4
Total derivatives, hedge assets at fair value 30 30
Derivative liability, current 54 43
Derivative liability, noncurrent 2 1
Total derivatives, hedge liabilities at fair value 56 44
Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Foreign exchange forward/options, hedge assets 12 [1] 8 [1]
Foreign exchange forwards/options, hedge liability at fair value 11 [1] 12 [1]
Commodity swaps/options, hedge assets at fair value 4 11
Commodity swaps/options, hedge liabilities at fair value 17 9
Total derivatives accounted for as hedges, hedge assets at fair value 16 19
Total derivatives accounted for as hedges, hedge liabilities at fair value 28 21
Maximum term of foreign exchange forwards/options, in months 15 months 18 months
Maximum term of commodity swaps/options, in months 27 months 24 months
Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Foreign exchange forwards/options at fair value, not accounted for as hedges 14 11
Foreign exchange forwards/options at fair value, not accounted for as hedges 28 23
Commodity swaps/options at fair value, not accounted for as hedges 0 0
Commodity swaps/option at fair value, not accounted for as hedges 0 0
Total derivatives not accounted for as hedges, hedge assets at fair value 14 11
Total derivatives not accounted for as hedges, hedge liabilities at fair value 28 23
Maximum term of foreign exchange forwards/options, in months 11 months 13 months
Maximum term of commodity swaps/options, in months 7 months 12 months
Foreign exchange | Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount 849 1,101
Foreign exchange | Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount 1,578 1,522
Commodity | Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount 339 354
Commodity | Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount $ 4 $ 6
[1] Foreign exchange derivatives accounted for as hedges are classified as cash flow (CF) hedges in 2013. During 2012, foreign exchanges derivatives accounted for as hedges were classified as either cash flow (CF) or fair value (FV) hedges.