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LHFI by Credit Quality Indicator (Parenthetical) (Detail) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans held for investment$ 117,475$ 115,975
Federally Guaranteed Residential Loans | Residential Nonguaranteed
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans held for investment4,4004,500
Guaranteed Student Loans | Consumer Other Direct
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans held for investment441413
Residential Nonguaranteed
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans held for investment23,517[1]23,959[1]
Consumer Other Direct
  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Loans held for investment$ 1,504[2]$ 1,309[2]
[1]Excludes $4.4 billion and $4.5 billion at September 30, 2011 and December 31, 2010, respectively, of federally guaranteed residential loans. At both September 30, 2011 and December 31, 2010, the majority of these loans had FICO scores of 700 and above.
[2]Excludes $441 million and $413 million as of September 30, 2011 and December 31, 2010, respectively, of private-label student loans with third party insurance. At both September 30, 2011 and December 31, 2010, the majority of these loans had FICO scores of 700 and above.