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Interest and Other Expense, Net within Results of Continuing Operations (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Interest expense, debt $ 1,177 $ 1,383 $ 1,540
Spin-Off-related financing fees and acquisition-related financing fees 609   251
Other expense / (income), net 77 235 (21)
Total interest and other expense, net $ 1,863 $ 1,618 $ 1,770