Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights - Additional Information (Details)

v3.5.0.2
Mortgage Servicing Rights - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Transfers and Servicing [Abstract]      
Impact of changes in interest rates and other market factors $ 282    
Prepayment rates      
Impact of 10% decrease 125 $ 125  
Impact of 20% decrease 262 262  
Impact of 10% increase (113) (113)  
Impact of 20% increase (217) (217)  
OAS level      
Impact of 100 bps decrease 80 80  
Impact of 200 bps decrease 167 167  
Impact of 100 bps increase (75) (75)  
Impact of 200 bps increase $ (145) $ (145)  
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]      
Weighted-average OAS 9.90% 9.90% 4.62%
Weighted-average life, in years   4 years 8 months 11 days 4 years 5 months 15 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]      
Weighted-average OAS 12.29% 12.29% 7.61%
Weighted-average life, in years   3 years 5 months 7 days 3 years 5 months 4 days