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Capitalized Servicing Assets - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jan. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Residential Mortgage Loans [Member]            
Servicing Assets at Fair Value [Line Items]            
Mortgage loans serviced for others $ 23,200 $ 26,300   $ 23,200 $ 26,300 $ 32,300
Fair value of residential loan servicing assets $ 257 $ 240   $ 257 $ 240  
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets 9.80% 9.40%        
Residential Mortgage Loans [Member] | LIBOR [Member]            
Servicing Assets at Fair Value [Line Items]            
Discounted rate represented weighted-average option-adjusted basis spread point percentage       8.94% 9.18%  
Residential Mortgage Sub Servicing Loan [Member]            
Servicing Assets at Fair Value [Line Items]            
Mortgage loans serviced for others $ 74,700 $ 68,100   $ 74,700 $ 68,100 62,800
Residential Real Estate [Member]            
Servicing Assets at Fair Value [Line Items]            
Fair value of residential loan servicing assets     $ 13,300      
Purchase price of servicing rights     $ 144      
Commercial Mortgage Loans [Member]            
Servicing Assets at Fair Value [Line Items]            
Mortgage loans serviced for others 20,200 18,900   20,200 18,900 17,600
Fair value of residential loan servicing assets $ 160 $ 160   $ 160 160  
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets 18.00% 18.00%   18.00%    
Commercial Mortgage Sub Servicing Loan [Member]            
Servicing Assets at Fair Value [Line Items]            
Mortgage loans serviced for others $ 3,500 $ 3,300   $ 3,500 $ 3,300 $ 3,400