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Mortgage Servicing - Narrative (Details) - USD ($) $ in Billions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Mortgage Servicing
Escrow balance	$ 1.3	$ 1.5
Fee-based servicing portfolio
Mortgage Servicing
Escrow balance	$ 1.4	$ 1.6
MSRs | Agency Business
Mortgage Servicing
Weighted average servicing fee rate (basis points)	0.388%	0.391%

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- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 440
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480327/954-440-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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