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Reconciliation of Revenues from Segment to Consolidated (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 1,626	$ 1,535	$ 4,512	$ 4,330
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	90	86	251	242
Franchise Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		183	181	495	490
Franchise Group | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	90	86	251	242
Franchise Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		273	267	746	732
Owned Brokerage Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		1,340	1,258	3,728	3,570
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		1,340	1,258	3,728	3,570
Title Group
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		103	96	289	270
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		103	96	289	270
Reportable Segment, Aggregation before Other Operating Segment | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	90	86	251	242
Reportable Segment, Aggregation before Other Operating Segment | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 1,716	$ 1,621	$ 4,763	$ 4,572
[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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- Definition

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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