Property and Equipment, Net (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Land	$ 20	$ 18
Buildings and leasehold improvements	633	602
Equipment	645	631
Computer software	1,424	1,656
Property, Plant and Equipment, Gross, Total	2,722	2,907
Accumulated depreciation	(1,338)	(1,679)
Property and equipment, net	$ 1,384	$ 1,228