Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	$ 5,636	$ 6,908	$ 7,983
Corporate, Non-Segment
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1],[2]	(315)	(373)	(407)
Franchise Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	983	1,145	1,249
Owned Brokerage Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	4,628	5,606	6,189
Title Group | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]	$ 340	$ 530	$ 952

[1] Transactions between segments are eliminated in consolidation. Revenues for Franchise Group include intercompany royalties and marketing fees paid by Owned Brokerage Group of $315 million, $373 million and $407 million for the years ended December 31, 2023, 2022 and 2021, respectively. Such amounts are eliminated through the Corporate and Other line.

[2] Includes the elimination of transactions between segments.