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Transfers of financial assets and servicing assets - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Jun. 30, 2023
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Weighted average mortgage servicing fees 0.32% 0.31% 0.32% 0.31%    
Liabilities incurred as a result of the securitizations $ 0 $ 0 $ 0 $ 0    
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transfer or Servicing Assets Or Liabilities Description Of Objectives Methodology And Limitations     The sensitivity analyses presented in the table above for servicing rights are hypothetical and should be used with caution. As the figures indicate, changes in fair value based on a 10 and 20 percent variation in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, in the sensitivity tables included herein, the effect of a variation in a particular assumption on the fair value of the retained interest is calculated without changing any other assumption. In reality, changes in one factor may result in changes in another (for example, increases in market interest rates may result in lower prepayments and increased credit losses), which might magnify or counteract the sensitivities.      
Mortgage loans related to buy-back option program 36,599,612,000   $ 36,599,612,000   $ 35,420,879,000  
Buy Back Option Program            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Mortgage loans related to buy-back option program 9,000,000   9,000,000   11,000,000  
GNMA            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Repurchased loans     27,000,000 34,000,000    
Residential Mortgage            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Mortgage loans related to buy-back option program 2,000,000,000.0   2,000,000,000.0   1,900,000,000  
Residential Mortgage | Loans with recourse            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Loans serviced 511,000,000 561,000,000 511,000,000 561,000,000 561,000,000  
Serviced mortgage loans            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Servicing rights on whole loan sales, principal balance 32,000,000 39,000,000 32,000,000 39,000,000    
Mortgage securitizations, net gains     900,000 600,000    
Loans serviced 9,200,000,000   9,200,000,000   $ 9,900,000,000  
Serviced mortgage loans | Loans with recourse            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Repurchased loans $ 500,000 $ 400,000 $ 1,500,000 $ 2,000,000.0    
Serviced mortgage loans | Servicing contract termination            
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]            
Servicing rights on whole loan sales, principal balance           $ 260,000,000
mortgage servicing right fair value           $ 2,000,000