Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Roll Forward]
Beginning balance	$ 307	$ 254
Additions	653	643
Amortization	(260)	(236)
Ending balance	700	661
Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	108	115
Additions	460	470
Amortization	(122)	(127)
Ending balance	446	458
Data Services and Other Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	93	88
Additions	161	159
Amortization	(99)	(89)
Ending balance	155	158
Mortgage technology
Disaggregation Of Revenue [Roll Forward]
Beginning balance	106	51
Additions	32	14
Amortization	(39)	(20)
Ending balance	$ 99	$ 45