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Equipment, Office Facilities, and Property (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]    
Software $ 1,067 $ 993
Buildings 456 446
Information technology equipment 398 430
Leasehold improvements 287 307
Furniture and equipment 133 131
Telecommunications equipment 95 104
Land 59 59
Construction in progress 7 17
Total equipment, office facilities, and property 2,502 2,487
Accumulated depreciation and amortization (1,827) (1,802)
Total equipment, office facilities, and property - net $ 675 $ 685