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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, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative Assets, Current $ 40 $ 26
Derivative Assets, Noncurrent 2 4
Total derivatives, hedge assets at fair value 42 30
Derivative Liabilities, Current 37 43
Derivative Liabilities, Noncurrent 3 1
Total derivatives, hedge liabilities at fair value 40 44
Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign exchange forwards/options 861 1,101
Notional amount of commodity swaps/options 343 354
Foreign exchange forward/options, hedge assets 16 8
Foreign Exchange Forwards/Options, Hedge Liability at Fair Value 5 12
Commodity Swaps/Options, Hedge Assets at Fair Value 3 11
Commodity Swaps/Options, Hedge Liabilities at Fair Value 16 9
Total derivatives accounted for as hedges, hedge assets at fair value 19 19
Total derivatives accounted for as hedges, hedge liabilities at fair value 21 21
Maximum term of foreign exchange forwards/options, in months 15 18
Maximum term of commodity swaps/options, in months 33 months 24 months
Not Designated as Hedging Instrument
    
Derivatives, Fair Value [Line Items]    
Notional amount of foreign exchange forwards/options 1,671 1,522
Notional amount of commodity swaps/options 9 6
Foreign Exchange Forwards/Options, Hedge Assets at Fair Value 23 11
Foreign Exchange Forwards/Options, Hedge Liabilities at Fair Value 19 23
Commodity swaps/options, hedge assets at fair value 0 0
Commodity Swaps/Options, hedge liabiilities at Fair Value 0 0
Total derivatives not accounted for as hedges, hedge assets at fair value 23 11
Total derivatives not accounted for as hedges, hedge liabilities at fair value $ 19 $ 23
Maximum term of foreign exchange forwards/options, in months 17 13
Maximum term of commodity swaps/options, in months 9 months 12 months