Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended		12 Months Ended					1 Months Ended	12 Months Ended	3 Months Ended
	Aug. 30, 2013	Apr. 02, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Altegris Capital Llc	Dec. 31, 2010 Altegris Capital Llc	Aug. 29, 2008 Quantuvis Consulting Inc	Dec. 31, 2011 Quantuvis Consulting Inc	Mar. 31, 2013 Contingent Consideration Liability	Mar. 31, 2013 Fair Value Less Costs to Sell Adjustment	Sep. 30, 2013 Closing	Mar. 31, 2013 Goodwill Impairment Loss
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition of businesses, approximate amount paid			$ 0	$ 0	$ 3		$ 40	$ 3
Additional performance-based payments, maximum							88	3
Contingent consideration						18			1
Proceeds from sale of business	412	79
Net proceeds from sale of business	360
Loss on sale of discontinued operations, net of taxes										(5)	(9)	(2)	(13)
Business acquisition contingent consideration liability										40
Contingent consideration to be received		25
Gain on sale of discontinued operations		$ 13