Deferred Revenue - Schedule of Rollforward (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Roll Forward]
Beginning balance	$ 254	$ 284
Additions	742	829
Amortization	(467)	(538)
Ending balance	529	575
Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	115	112
Additions	474	500
Amortization	(252)	(261)
Ending balance	337	351
Data Services and Other Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	88	93
Additions	236	283
Amortization	(175)	(222)
Ending balance	149	154
Mortgage technology
Disaggregation Of Revenue [Roll Forward]
Beginning balance	51	79
Additions	32	46
Amortization	(40)	(55)
Ending balance	$ 43	$ 70