Guarantee Arrangements and Pledged Assets and Collateral - Trend in Repurchase Demands Received on Loans Sold to GSEs and Other Third Parties by Loan Origination Vintage (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Pre- 2004	$ 12		$ 7		$ 5
2004	27		21		13
2005	43		28		24
2006	56		80		56
2007	106		209		146
2008	60		123		98
Post 2008	14		18		68
Total repurchase demands received	$ 318	[1]	$ 486	[1]	$ 410	[1]

[1] Includes repurchase demands on loans sourced from our legacy broker channel of $245 million, $393 million and $300 million at December 31, 2013, 2012 and 2011, respectively.