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Valuation and Qualifying Accounts (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventory Valuation Reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 60 $ 50 $ 50
Charged to costs and expenses 95 103 67
Additions/ (Deductions) (106) (93) (67)
Balance at end of period 49 60 50
Allowance for Trade Receivables [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 15 17 19
Charged to costs and expenses 1 1 1
Additions/ (Deductions) (6) (3) (3)
Balance at end of period 10 15 17
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 1,514 1,396 1,337
Translation adjustment 6 (11) (13)
Charged to costs and expenses 78 138 81
Additions/ (Deductions) (9) (9) (9)
Balance at end of period $ 1,589 $ 1,514 $ 1,396