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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($) $ in Billions | Sep. 30, 2024 | Dec. 31, 2023
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Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 159.5 | $ 169.7
Percent of aggregate unpaid principal balance | 6.90% | 7.50%
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 3.20% | 3.70%
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 1.20% | 1.20%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 2.40% | 2.60%
Fair Value Non-Agency Mortgage Servicing Rights |  |
Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 22.1 | $ 23.8
Percent of aggregate unpaid principal balance | 18.60% | 21.20%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 8.20% | 9.40%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 3.50% | 3.60%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 6.90% | 8.20%
Fair Value GSE Mortgage Servicing Rights |  |
Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 118.9 | $ 127.3
Percent of aggregate unpaid principal balance | 1.90% | 1.90%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 1.10% | 1.20%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 0.30% | 0.20%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 0.50% | 0.50%
Fair Value GNMA Mortgage Servicing Rights |  |
Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 18.4 | $ 18.6
Percent of aggregate unpaid principal balance | 11.50% | 11.80%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 5.30% | 6.10%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 2.00% | 2.00%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 4.20% | 3.70%

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