Deferred Revenue - Schedule of Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Roll Forward]
Beginning balance	$ 254	$ 284
Additions	643	684
Amortization	(236)	(273)
Ending balance	661	695
Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	115	112
Additions	470	472
Amortization	(127)	(129)
Ending balance	458	455
Data Services and Other Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	88	93
Additions	159	186
Amortization	(89)	(112)
Ending balance	158	167
Mortgage technology
Disaggregation Of Revenue [Roll Forward]
Beginning balance	51	79
Additions	14	26
Amortization	(20)	(32)
Ending balance	$ 45	$ 73