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Composition of the Company's Loan Portfolio (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans carried at fair value $ 379 [1] $ 433 [1]
Loans and Leases Receivable, Deferred Income 639 716
Residential Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans carried at fair value 379 431
Residential Portfolio Segment [Member] | Residential Nonguaranteed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans carried at fair value $ 379 $ 431
[1] 2 Includes loans of consolidated VIEs365 3,322