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Commitments and Contingent Liabilities - Rent Expense (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Rent expense $ 82 $ 83 $ 86
Office facilities [Member]
     
Property, Plant and Equipment [Line Items]      
Rent expense 71 73 77
Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Rent expense $ 11 $ 10 $ 9