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Valuation and Qualifying Accounts (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Inventories [Member]
      
Valuation and Qualifying Accounts      
Balance at beginning of period $ 50 $ 50 $ 72
Charged to costs and expenses 103 67 102
Additions/ (Deductions) (93) (67) (124)
Balance at end of period 60 50 50
Accounts Receivable [Member]
      
Valuation and Qualifying Accounts      
Balance at beginning of period 17 19 25
Charged to costs and expenses 1 1 2
Additions/ (Deductions) (3) (3) (8)
Balance at end of period 15 17 19
Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts      
Balance at beginning of period 1,396 1,337 1,283
Translation adjustment (11) (13) 6
Charged to costs and expenses 138 81 79
Additions/ (Deductions) (9) (9) (31)
Balance at end of period $ 1,514 $ 1,396 $ 1,337