Equipment, Office Facilities, and Property (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Software	$ 993	$ 902
Buildings	446	438
Information technology equipment	430	405
Leasehold improvements	307	282
Furniture and equipment	131	118
Telecommunications equipment	104	91
Land	59	57
Construction in progress	17	15
Total equipment, office facilities, and property	2,487	2,308
Accumulated depreciation and amortization	(1,802)	(1,684)
Total equipment, office facilities, and property - net	$ 685	$ 624