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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($)
$ in Billions
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Participating Mortgage Loans [Line Items]      
Assets serviced $ 201.1 $ 199.6 $ 198.0
Percent of aggregate unpaid principal balance 11.40% 11.10%  
30 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 5.20% 4.80%  
60 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 1.90% 1.80%  
90 days or more      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 4.20% 4.50%  
Fair Value Agency Mortgage Servicing Rights      
Participating Mortgage Loans [Line Items]      
Assets serviced $ 143.1 $ 137.6  
Percent of aggregate unpaid principal balance 3.40% 3.30%  
Fair Value Agency Mortgage Servicing Rights | 30 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 1.90% 1.70%  
Fair Value Agency Mortgage Servicing Rights | 60 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 0.50% 0.50%  
Fair Value Agency Mortgage Servicing Rights | 90 days or more      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 1.00% 1.10%  
Fair Value Non-Agency Mortgage Servicing Rights      
Participating Mortgage Loans [Line Items]      
Assets serviced $ 57.9 $ 62.0  
Percent of aggregate unpaid principal balance 22.00% 20.40%  
Fair Value Non-Agency Mortgage Servicing Rights | 30 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 9.70% 8.50%  
Fair Value Non-Agency Mortgage Servicing Rights | 60 days      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 3.90% 3.30%  
Fair Value Non-Agency Mortgage Servicing Rights | 90 days or more      
Participating Mortgage Loans [Line Items]      
Percent of aggregate unpaid principal balance 8.50% 8.60%