Segment Information - Segment Profit or Loss, and Reconciliation of Segment Profit/(Loss) to Net Income/(Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Information
Revenue	$ 674			$ 597			$ 1,926	$ 1,832
Less:
Adjusted cost of revenue	270			237			743	729
Adjusted sales and marketing	108			99			322	297
Adjusted technology and content	130			112			370	332
Adjusted general and administrative	76			75			213	241
Total operating expenses	662			570			1,825	1,747
Share of income (loss) from equity-method investments	2			0			4	0
Less: other segment items	12			27			101	85
Interest income	2			2			6	4
Interest expense	(24)			(28)			(71)	(93)
Loss on early extinguishment of debt	0			38			2	38
Depreciation and amortization	(49)			(43)			(132)	(138)
Net (loss) income	(62)	$ 15	$ 75	(128)	$ 27	$ (19)	28	(120)
Reportable Segment
Segment Information
Revenue	674			597			1,926	1,832
Less:
Adjusted cost of revenue	269			235			739	725
Adjusted sales and marketing	103			94			304	280
Adjusted technology and content	125			106			351	315
Adjusted general and administrative	51			44			134	144
Total operating expenses	548			479			1,528	1,464
Share of income (loss) from equity-method investments	2			0			4	0
Interest income	2			2			6	4
Interest expense	(24)			(28)			(71)	(93)
Loss on early extinguishment of debt	0			(38)			(2)	(38)
Depreciation and amortization	(49)			(43)			(132)	(138)
Other, net	(119)			(139)			(175)	(223)
Net (loss) income	$ (62)			$ (128)			$ 28	$ (120)