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Reconciliation of Revenues from Segment to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 1,682	$ 1,669	$ 2,886	$ 2,795
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	93	92	161	156
Franchise Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		176	173	312	309
Franchise Group | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	93	92	161	156
Franchise Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		269	265	473	465
Owned Brokerage Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		1,398	1,393	2,388	2,312
Owned Brokerage Group | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	0	0	0	0
Owned Brokerage Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		1,398	1,393	2,388	2,312
Title Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		108	103	186	174
Title Group | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	0	0	0	0
Title Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		108	103	186	174
Reportable Segment, Aggregation before Other Operating Segment | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	93	92	161	156
Reportable Segment, Aggregation before Other Operating Segment | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 1,775	$ 1,761	$ 3,047	$ 2,951
[1] Intersegment revenues include intercompany royalties and marketing fees paid by Owned Brokerage Group to Franchise Group and are eliminated in consolidation.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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