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Mortgage Servicing Rights - Sensitivity Impacts (Details)

v3.3.0.814
Mortgage Servicing Rights - Sensitivity Impacts (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
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]  
Prepayment rates, impact of 10 percent decrease $ 194
Prepayment rates, impact of 20 percent decrease 414
Prepayment rates, impact of 10 percent increase (173)
Prepayment rates, impact of 20 percent increase (328)
OAS level, impact of 100 bps decrease 128
OAS level, impact of 200 bps decrease 266
OAS level, impact of 100 bps increase (118)
OAS level, impact of 200 bps increase $ (227)
Fixed  
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 decrease 2 months 23 days
Impact of 20 percent decrease 5 months 26 days
Impact of 10 percent increase 2 months 12 days
Impact of 20 percent increase 4 months 17 days
Adjustable  
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 decrease 2 months 8 days
Impact of 20 percent decrease 4 months 27 days
Impact of 10 percent increase 2 months 1 day
Impact of 20 percent increase 3 months 25 days