Quarterly report pursuant to Section 13 or 15(d)

Loans, Notes and Mortgages - Loans Outstanding (Details)

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Loans, Notes and Mortgages - Loans Outstanding (Details) (USD $)
In Billions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Other Loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held-for-sale $ 1.6 $ 2.3
Consumer Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans in portfolio 36,000  
Loans held-for-sale 0.9 1.4
Commercial Loan [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of loans in portfolio 400  
Loans held-for-sale $ 0.7 $ 0.9