v3.25.2
Relationship with BLG and Bayview Financial (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]          
Revenue from contract with customer $ 417,000,000 $ 388,000,000 $ 814,000,000 $ 755,000,000  
Deposits 164,453,000,000   164,453,000,000   $ 161,095,000,000
Bayview Financial          
Schedule of Equity Method Investments [Line Items]          
Deposits $ 3,500,000,000   $ 3,500,000,000   2,200,000,000
Bayview Lending Group          
Schedule of Equity Method Investments [Line Items]          
Ownership percentage (as a percent) 20.00%   20.00%    
Equity method investments $ 0   $ 0    
Bayview Lending Group | Other Revenues From Operations          
Schedule of Equity Method Investments [Line Items]          
Income from equity method investments       25,000,000  
Bayview Lending Group and Bayview Financial          
Schedule of Equity Method Investments [Line Items]          
Outstanding principal balances of mortgage servicing rights 939,000,000   939,000,000   1,000,000,000.0
Revenue from contract with customer 1,000,000 1,000,000 2,000,000 3,000,000  
Bayview Financial          
Schedule of Equity Method Investments [Line Items]          
Outstanding principal balances of residential mortgage loans from Bayview Financial 157,600,000,000   157,600,000,000   111,500,000,000
Revenues from sub-servicing 55,000,000 $ 31,000,000 95,000,000 $ 63,000,000  
Investment securities in held-to-maturity portfolio securitized by Bayview Financial 34,000,000   34,000,000   37,000,000
Commitments to extend credit 1,000,000,000   1,000,000,000    
Outstanding balance $ 666,000,000   $ 666,000,000   $ 404,000,000