Subsequent Event - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jan. 31, 2013
Subsequent Event
Subsequent Event [Line Items]
Expected pre-tax charge	$ 38
Expected total cash payment	25
Severance and other termination benefits
Subsequent Event [Line Items]
Expected pre-tax charge	18
Expected workforce reduction, number of employees	300
Facility- And Asset-Related Charges
Subsequent Event [Line Items]
Expected pre-tax charge	16
Software And Other
Subsequent Event [Line Items]
Expected pre-tax charge	$ 4