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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
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%

X

- Definition

Total of property assets serviced as measured by UPB.

+ References

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X

- Definition

Percentage of financing receivable balance that is past due.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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