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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Lines of Credit in Place (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Jul. 15, 2023
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Carrying Value	$ 839,000,000	$ 666,000,000
Revolving credit facility	820,000,000	0
Warehouse Agreement Borrowings
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	3,200,000,000	3,200,000,000
Carrying Value	839,000,000	666,000,000
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	1,335,000,000	1,335,000,000
Carrying Value	$ 711,000,000	613,000,000
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.50%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.05%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 15,000,000	15,000,000
Carrying Value	$ 1,000,000	0
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	2.75%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.05%
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 650,000,000	650,000,000
Carrying Value	$ 20,000,000	7,000,000
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing | London Interbank Offered Rate (LIBOR) | Maximum
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.45%
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing | London Interbank Offered Rate (LIBOR) | Minimum
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.25%
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 600,000,000	600,000,000	$ 300,000,000
Carrying Value	21,000,000	28,000,000
Revolving credit facility	$ 300,000,000		$ 300,000,000
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.30%
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 350,000,000	350,000,000
Carrying Value	$ 86,000,000	18,000,000
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.25%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size	$ 250,000,000	250,000,000
Carrying Value	$ 0	$ 0
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.25%
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	0.10%

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Warehouse receivables and warehouse lines of credit.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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X

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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- Definition

Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

+ References

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-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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