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Loans - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net deferred origination costs $ 30,000,000   $ 30,000,000   $ 48,000,000
Net unamortized premium on loans 29,000,000   29,000,000   28,000,000
Amortized net premiums on loans 2,000,000 10,000,000 20,000,000 38,000,000  
Nonaccrual Loans 1,790,000,000   1,790,000,000   1,828,000,000
Current Interest income of nonaccrual loans 37,000,000 27,000,000 92,000,000 86,000,000  
Current Interest income (expense) and other income included in finance for loans 10,000,000 4,000,000 10,000,000 13,000,000  
Loans discharged under bankruptcy and not re-affirmed to residential mortgage TDR Loan balances 186,000,000        
Closed end first lien loans held for sale $ 500,000,000   $ 500,000,000   $ 2,000,000,000