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Capitalized Servicing Assets - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2019
Dec. 31, 2023
Dec. 31, 2022
Servicing Assets at Fair Value [Line Items]      
Loans receivable   $ 134,936 $ 132,074
Purchase of residential mortgage loans   $ 350  
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   14.43% 18.00%
Residential Mortgage Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
Total loans serviced for others   $ 155,342 $ 118,392
Fair value of residential loan servicing assets   $ 611 $ 336
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   11.45% 12.29%
Residential Mortgage Loans [Member] | LIBOR [Member]      
Servicing Assets at Fair Value [Line Items]      
Discounted rate represented weighted-average option-adjusted basis spread point percentage     8.81%
Residential Mortgage Loans [Member] | SOFR [Member]      
Servicing Assets at Fair Value [Line Items]      
Discounted rate represented weighted-average option-adjusted basis spread point percentage   7.90%  
Residential Real Estate [Member]      
Servicing Assets at Fair Value [Line Items]      
Loans receivable   $ 19,500  
Fair value of residential loan servicing assets $ 1,100    
Purchase price of servicing rights $ 12    
Commercial Mortgage Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
Total loans serviced for others   28,030 $ 26,007
Fair value of residential loan servicing assets   $ 193 $ 156
Weighted average discount rates used to estimate fair value of capitalized mortgaged loan servicing assets   14.43%