Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights - Rollforward of Mortgage Servicing Rights (Details)

v2.4.0.8
Mortgage Servicing Rights - Rollforward of Mortgage Servicing Rights (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 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         $ 12,000,000 $ 135,000,000
Activity for residential first mortgage MSRs            
Balance, beginning of period 5,776,000,000 7,589,000,000 5,716,000,000 7,378,000,000    
Additions 147,000,000 91,000,000 270,000,000 168,000,000    
Sales (862,000,000) (98,000,000) (1,045,000,000) (98,000,000)    
Impact of customer payments (260,000,000) [1] (282,000,000) [1] (574,000,000) [1] (803,000,000) [1]    
Impact of changes in interest rates and other market factors 806,000,000 [2] (1,717,000,000) [2] 1,138,000,000 [2] (742,000,000) [2]    
Model and other cash flow assumption changes:            
Projected cash flows, primarily due to increases in cost to service loans 148,000,000 [3] 666,000,000 [3] 14,000,000 [3] 393,000,000 [3]    
Impact of changes in the Home Price Index (123,000,000) [3] 5,000,000 [3] (202,000,000) [3] 20,000,000 [3]    
Impact of changes to the prepayment model 228,000,000 [3] 342,000,000 [3] 403,000,000 [3] 342,000,000 [3]    
Other model changes (33,000,000) [3],[4] (888,000,000) [3],[4] 107,000,000 [3],[4] (950,000,000) [3],[4]    
Balance, end of period 5,827,000,000 5,708,000,000 5,827,000,000 5,708,000,000    
Mortgage loans serviced for investors (in billions) 759,000,000,000 1,224,000,000,000 759,000,000,000 1,224,000,000,000    
Option adjusted spread due to MSR model recalibration   $ 879,000,000   $ 929,000,000    
[1] Represents the change in the 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.
[3] These amounts reflect periodic adjustments to the valuation model to reflect changes in the modeled relationship between inputs and their impact on projected cash flows as well as changes in certain cash flow assumptions such as cost to service and ancillary income per loan.
[4] These amounts include the impact of periodic recalibrations of the model to reflect changes in the relationship between market interest rate spreads and projected cash flows. Also included are decreases of $879 million and $929 million for the three and six months ended June 30, 2012 due to changes in OAS rate inputs.