XML 54 R56.htm IDEA: XBRL DOCUMENT v2.4.0.8
Mortgage Loans Narratives (Details) (USD $)
In Billions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mortgage Loans on Real Estate [Abstract]      
Carrying value of loans redesignated from HFI to HFS $ 2.2    
Sale of loans, unpaid principal balance $ 1.0    
Minimum past due months of single-family nonaccrual loans 2 months   2 months
Average term extension of a single-family modified loan 159 months 148 months  
Average interest rate reduction of a single-family modified loan 1.23% 1.81%