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Warehouse Receivables & Warehouse Lines of Credit - Schedule of Warehouse Lines of Credit in Place (Details) - USD ($)				9 Months Ended
	Aug. 01, 2025	Jul. 31, 2025	Dec. 13, 2024	Sep. 30, 2025	Jul. 15, 2025	Jun. 20, 2025	Jun. 19, 2025	Jun. 09, 2025	Jun. 08, 2025	Dec. 31, 2024	Oct. 30, 2024
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Carrying Value				$ 1,624,000,000						$ 552,000,000
Revolving credit facilities				0						132,000,000
Warehouse lines of credit
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				3,200,000,000						3,500,000,000
Carrying Value				1,624,000,000						552,000,000
Warehouse lines of credit | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				1,310,000,000				$ 1,700,000,000	$ 1,400,000,000	1,310,000,000
Carrying Value				$ 970,000,000						306,000,000
Warehouse lines of credit | 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)			2.00%	1.50%
Warehouse lines of credit | 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 lines of credit | 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				$ 0						0
Warehouse lines of credit | 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 lines of credit | 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 lines of credit | JP Morgan | JP Morgan
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 25,000,000						25,000,000
Carrying Value				$ 0						0
Warehouse lines of credit | JP Morgan | JP Morgan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)				2.00%
Warehouse lines of credit | JP Morgan | JP Morgan | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)				0.05%
Warehouse lines of credit | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Variable rate (as a percent)	1.35%	1.45%
Maximum Facility Size				$ 650,000,000		$ 725,000,000	$ 650,000,000			650,000,000
Carrying Value				$ 395,000,000						1,000,000
Warehouse lines of credit | 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 lines of credit | 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)				1.35%
Warehouse lines of credit | TD Bank | TD Bank, Pricing
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 600,000,000	$ 300,000,000					900,000,000	$ 600,000,000
Carrying Value				$ 35,000,000						103,000,000
Revolving credit facilities					$ 300,000,000
Warehouse lines of credit | 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)				1.25%
Warehouse lines of credit | 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 lines of credit | 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				$ 224,000,000						142,000,000
Warehouse lines of credit | 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 lines of credit | 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 lines of credit | 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 lines of credit | 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 lines of credit | 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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- Definition

Warehouse receivables and warehouse lines of credit.

+ References

No definition available.

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- Definition

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

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No definition available.

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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
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- 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

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-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/1943274/2147478546/942-210-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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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