Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights (Details)

Mortgage Servicing Rights (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Commercial and Residential Reverse Mortgage [Member]
Dec. 31, 2012
Commercial and Residential Reverse Mortgage [Member]
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Amortized Cost     $ 120,000,000 $ 135,000,000
Activity for residential first mortgage MSRs        
Balance, Beginning of period 5,716,000,000 7,378,000,000    
Additions 123,000,000 77,000,000    
Sales (183,000,000) 0    
Impact of customer payments (314,000,000) [1] (521,000,000) [1]    
Impact of changes in interest rates and other market factors 332,000,000 [2] 925,000,000 [2]    
Model and other cash flow assumption changes:        
Projected cash flows, primarily due to increases in cost to service loans (134,000,000) [3] (273,000,000) [3]    
Impact of changes in the Home Price Index (79,000,000) [3] 15,000,000 [3]    
Impact of changes to the prepayment model 175,000,000 [3] 0 [3]    
Other model changes 140,000,000 [3] (12,000,000) [3]    
Balance, September 30 5,776,000,000 7,589,000,000    
Mortgage loans serviced for investors (in billions) $ 949,000,000,000 $ 1,313,000,000,000    
[1] Represents the change in the market value of the MSR asset due to the impact of customer payments received during the period.
[2] These amounts reflect the changes in modeled MSR fair value primarily due to observed changes in interest rates, volatility, spreads and the shape of the forward swap curve, as well as changes in OAS and prepayment rates.
[3] These amounts reflect periodic adjustments to the valuation model as well as changes in certain cash flow assumptions such as cost to service and ancillary income per loan. For the three months ended March 31, 2013 and 2012, included in other model changes is the effect to the MSR cash flow assumptions caused by changes in spreads between primary and secondary markets.