Annual report pursuant to Section 13 and 15(d)

Mortgage Servicing Rights - Sensitivity Analysis (Details)

v2.4.0.6
Mortgage Servicing Rights - Sensitivity Analysis (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
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% 510
Change in Fair Value, Impact of 20% 1,094
Change in Fair Value, Impact of 100 bps 256
Change in Fair Value, Impact of 200 bps 535
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% (450)
Change in Fair Value, Impact of 20% (849)
Change in Fair Value, Impact of 100 bps (237)
Change in Fair Value, Impact of 200 bps (455)
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 3 months 22 days
Impact Of 20 Percent Change 8 months 1 day
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 3 months 7 days
Impact Of 20 Percent Change 6 months 4 days
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 2 months 12 days
Impact Of 20 Percent Change 5 months 5 days
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 2 months 1 day
Impact Of 20 Percent Change 3 months 26 days