XML 45 R141.htm IDEA: XBRL DOCUMENT v2.4.0.6
Guarantee Arrangements and Pledged Assets - Outstanding Repurchase Demands Received From GSEs and Other Third Parties (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Commitments And Guarantee Obligations [Line Items]    
Outstanding repurchase demands on loans sourced from our legacy broker channel $ 143 $ 87