Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights (Details 2)

v2.4.0.6
Mortgage Servicing Rights (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Decrease [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Change in Fair Value, Impact of 10% 462
Change in Fair Value, Impact of 20% 984
Change in Fair Value, Impact of 100 bps 277
Change in Fair Value, Impact Of 200 bps 578
Increase [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Change in Fair Value, Impact of 10% (412)
Change in Fair Value, Impact of 20% (781)
Change in Fair Value, Impact of 100 bps (255)
Change in Fair Value, Impact Of 200 bps (490)
Fixed [Member] | Decrease [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Impact of 10 percent change P0.31Y
Impact of 20 percent change P0.67Y
Fixed [Member] | Increase [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Impact of 10 percent change P(0.28)Y
Impact of 20 percent change P(0.52)Y
Adjustable [Member] | Decrease [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Impact of 10 percent change P0.21Y
Impact of 20 percent change P0.45Y
Adjustable [Member] | Increase [Member]
 
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]  
Impact of 10 percent change P(0.18)Y
Impact of 20 percent change P(0.34)Y