Basis of Presentation - Summary of Reclassification Adjustments Made Between Operating Expenses (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales (formerly Cost of revenue)		$ 42	$ 40	$ 68	$ 64
Marketing (formerly Selling and marketing)	[1]	218	204	389	366
Personnel (including stock-based compensation of $34 and $61)		149	153	293	303
Technology (formerly Technology and content)	[1]	25	22	48	44
General and administrative		13	21	31	50
Depreciation and amortization		23	21	44	42
Restructuring and other related reorganization costs		0	0	10	1
Total costs and expenses		$ 470	461	$ 883	870
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales (formerly Cost of revenue)			46		81
Marketing (formerly Selling and marketing)			263		484
Personnel (including stock-based compensation of $34 and $61)			0		0
Technology (formerly Technology and content)			75		151
General and administrative			56		112
Depreciation and amortization			21		42
Restructuring and other related reorganization costs			0		0
Total costs and expenses			461		870
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales (formerly Cost of revenue)	[2]		(6)		(17)
Marketing (formerly Selling and marketing)	[3]		(59)		(118)
Personnel (including stock-based compensation of $34 and $61)	[4]		153		303
Technology (formerly Technology and content)	[5]		(53)		(107)
General and administrative	[6]		(35)		(62)
Depreciation and amortization			0		0
Restructuring and other related reorganization costs			0		1	[7]
Total costs and expenses			0		0
As Adjusted [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales (formerly Cost of revenue)			40		64
Marketing (formerly Selling and marketing)			204		366
Personnel (including stock-based compensation of $34 and $61)			153		303
Technology (formerly Technology and content)			22		44
General and administrative			21		50
Depreciation and amortization			21		42
Restructuring and other related reorganization costs			0		1
Total costs and expenses			$ 461		$ 870

[1] The significant segment expense categories and amounts align with the segment-level information that is regularly provided to our CODM.

[2] Primarily related to the reclass of people costs to Personnel, and data center costs, and to a lesser extent, licensing costs to Technology; partially offset by the reclass of digital service taxes ("DST") and bad debt expense from General and administrative to Costs of sales.

[3] Primarily related to the reclass of people costs to Personnel, and to a lesser extent, licensing costs to Technology and real estate and office expenses to General and administrative.

[4] Related to the reclass of people costs, including stock-based compensation expense, from all legacy operating expense captions to Personnel.

[5] Primarily related to the reclass of people costs to Personnel, and to a lesser extent, the reclass of real estate and office expenses to General and administrative; partially offset by the reclass of data center and licensing costs from all legacy operating expense captions to Technology.

[6] Primarily related to the reclass of people costs to Personnel, and to a lesser extent, the reclass of DST and bad debt expense to Costs of sales; partially offset by the reclass of real estate and office expenses to General and administrative from all legacy operating expense captions.

[7] Reclass of Restructuring and other related reorganization costs from General and administrative for comparability with the current period presentation.