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Hedges and Derivative Financial Instruments (Schedule of Outstanding Derivative Contracts) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Derivative asset at fair value, current $ 46 $ 28
Derivative asset at fair value, noncurrent 2 2
Total derivatives, hedge assets at fair value 48 30
Derivative liability at fair value, current 39 54
Derivative liability at fair value, noncurrent 3 1
Total derivatives, hedge liabilities at fair value 42 55
Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Foreign exchange forward/options, hedge assets at fair value 21 [1] 16 [1]
Foreign exchange forwards/options, hedge liability at fair value 5 [1] 10 [1]
Commodity swaps/options, hedge assets at fair value 5 8
Commodity swaps/options, hedge liabilities at fair value 21 13
Total derivatives accounted for as hedges, hedge assets at fair value 26 24
Total derivatives accounted for as hedges, hedge liabilities at fair value 26 23
Maximum term of foreign exchange forwards/options, in months 13 months 14 months
Maximum term of commodity swaps/options, in months 33 months 36 months
Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Foreign exchange forwards/options at fair value, not accounted for as hedges 22 6
Foreign exchange forwards/options at fair value, not accounted for as hedges 16 32
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 22 6
Total derivatives not accounted for as hedges, hedge liabilities at fair value 16 32
Maximum term of foreign exchange forwards/options, in months 11 months 12 months
Maximum term of commodity swaps/options, in months 12 months 4 months
Foreign exchange | Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 746 744
Foreign exchange | Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 1,222 1,274
Commodity | Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount 378 363
Commodity | Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Notional Amount $ 8 $ 1
[1] Derivatives accounted for as hedges are either considered cash flow (CF) or fair value (FV) hedges.