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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($) $ in Billions | Mar. 31, 2025 | Dec. 31, 2024
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Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 178.1 | $ 170.3
Percent of aggregate unpaid principal balance | 5.90% | 6.50%
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 3.00% | 3.10%
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 0.80% | 1.10%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Participating Mortgage Loans [Line Items] |  |
Percent of aggregate unpaid principal balance | 2.10% | 2.30%
Fair Value Non-Agency Mortgage Servicing Rights |  |
Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 21.1 | $ 21.6
Percent of aggregate unpaid principal balance | 17.30% | 18.70%
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% | 8.40%
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 | 2.60% | 3.40%
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 | 6.50% | 6.90%
Fair Value GSE Mortgage Servicing Rights |  |
Participating Mortgage Loans [Line Items] |  |
Assets serviced | $ 137.1 | $ 129.3
Percent of aggregate unpaid principal balance | 1.80% | 1.80%
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 | 1.20% | 1.00%
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 | 0.20% | 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 | $ 19.9 | $ 19.4
Percent of aggregate unpaid principal balance | 10.10% | 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 | 4.70% | 5.40%
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 | 1.40% | 1.80%
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 | 4.00% | 4.50%

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