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Transfers and Servicing of Mortgage Loans (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Transfers and Servicing [Abstract]      
Servicing portfolio $ 226,259   $ 231,741
Activity in the loan servicing portfolio associated with capitalized servicing rights      
Balance, beginning of period 226,259    
Balance, end of period 231,741    
Percentage of mortgage servicing rights restricted from sale without prior approval     27.00%
Capitalized servicing rights      
Transfers and Servicing [Abstract]      
Servicing portfolio 98,990 $ 112,686 $ 92,687
Activity in the loan servicing portfolio associated with capitalized servicing rights      
Balance, beginning of period 98,990 112,686  
Additions 2,960 4,323  
Payoffs and curtailments (8,767) (9,966)  
Sales (496) (2,338)  
Balance, end of period $ 92,687 $ 104,705  
Commitment to sell Mortgage Servicing Rights     303
Commitment to sell Mortgage servicing rights, fair value     4
Interest rate lock commitments and mortgage loans held for sale      
Activity in the loan servicing portfolio associated with capitalized servicing rights      
Commitment to sell Mortgage Servicing Rights     $ 266