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Guarantee Arrangements and Pledged Assets - 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
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Commitments And Guarantee Obligations [Line Items]        
Pre- 2004 $ 2 $ 1 $ 5 $ 4
2004 5 1 16 10
2005 6 6 19 20
2006 20 11 65 35
2007 51 34 170 104
2008 28 15 106 73
Post 2008 4 14 15 59
Total repurchase demands received $ 116 $ 82 $ 396 $ 305