Deferred Revenue - Schedule of Rollforward (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Roll Forward]
Beginning balance	$ 284	$ 259
Additions	897	877
Amortization	(771)	(714)
Ending balance	410	422
Annual Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	0	0
Additions	434	397
Amortization	(327)	(301)
Ending balance	107	96
Original Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	19	13
Additions	32	26
Amortization	(28)	(24)
Ending balance	23	15
Other Listings Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	93	92
Additions	39	42
Amortization	(33)	(31)
Ending balance	99	103
Data Services and Other Revenues
Disaggregation Of Revenue [Roll Forward]
Beginning balance	93	95
Additions	330	352
Amortization	(301)	(319)
Ending balance	122	128
Mortgage technology
Disaggregation Of Revenue [Roll Forward]
Beginning balance	79	59
Additions	62	60
Amortization	(82)	(39)
Ending balance	$ 59	$ 80