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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Principal value of variable rate long term debt | $ 206 |  |  |
Securitization obligations | $ 115 |  | $ 163 |
Owned Brokerage Group | Geographic Concentration Risk - California |  |  |  |
Concentration risk, geographic area, revenue | 22.00% |  | 23.00% | 25.00%
Owned Brokerage Group | Geographic Concentration Risk - New York |  |  |  |
Concentration risk, geographic area, revenue | 21.00% |  | 21.00% | 21.00%
Owned Brokerage Group | Geographic Concentration Risk - Florida |  |  |  |
Concentration risk, geographic area, revenue | 14.00% |  | 13.00% | 13.00%
Revolving Credit Facility | Line of Credit |  |  |  |
Long-term Line of Credit | $ 285 | [1],[2] | $ 350 |
[1] | As of December 31, 2023, the Company had $1,100 million of borrowing capacity under its Revolving Credit Facility. As of December 31, 2023, there were $285 million outstanding borrowings under the Revolving Credit Facility and $33 million of outstanding undrawn letters of credit. On February 14, 2024, the Company had $383 million outstanding borrowings under the Revolving Credit Facility and $33 million of outstanding undrawn letters of credit.
[2] | See below under the header "Senior Secured Credit Agreement and Term Loan A Agreement" for additional information.

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- Definition Description of risks that arise due to concentrations of revenues in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures). + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: 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(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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