Segment Information - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 3,786	$ 3,558	$ 6,774	$ 6,447
Selling and marketing - direct	1,920	1,793	3,677	3,443
Adjusted EBITDA	908	786	1,204	1,041
Depreciation	(212)	(190)	(420)	(385)
Amortization of intangible assets	(11)	(15)	(22)	(30)
Stock-based compensation	(105)	(114)	(203)	(218)
Legal reserves, occupancy tax and other	(2)	(21)	(2)	(41)
Restructuring and related reorganization charges, excluding stock-based compensation	(41)	(10)	(67)	(58)
Realized (gain) loss on revenue hedges	(52)	15	(75)	32
Operating income (loss)	485	451	415	341
Other expense, net	(62)	37	(209)	(8)
Income before income taxes	423	488	206	333
Provision for income taxes	(101)	(113)	(81)	(94)
Net income	322	375	125	239
Net loss attributable to non-controlling interests	8	11	5	12
Net income attributable to Expedia Group, Inc.	330	386	130	251
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	(60)	(51)	(106)	(91)
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(60)	(51)	(106)	(91)
Selling and marketing - direct	(60)	(51)	(106)	(91)
Other segment items	145	126	277	249
Adjusted EBITDA	(145)	(126)	(277)	(249)
Depreciation	(28)	(26)	(56)	(53)
Amortization of intangible assets	(11)	(15)	(22)	(30)
Stock-based compensation	(105)	(114)	(203)	(218)
Legal reserves, occupancy tax and other	(2)	(21)	(2)	(41)
Restructuring and related reorganization charges, excluding stock-based compensation	(41)	(10)	(67)	(58)
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	(332)	(312)	(627)	(649)
B2C
Segment Reporting Information [Line Items]
Revenue	2,479	2,432	4,435	4,418
B2C | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
B2C | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	2,479	2,432	4,435	4,418
Cost of revenue	340	326	652	638
Selling and marketing - direct	1,092	1,101	2,207	2,197
Other segment items	319	351	631	714
Adjusted EBITDA	728	654	945	869
Depreciation	(138)	(129)	(273)	(262)
Amortization of intangible assets	0	0
Stock-based compensation	0	0
Legal reserves, occupancy tax and other	0	0
Restructuring and related reorganization charges, excluding stock-based compensation	0	0
Realized (gain) loss on revenue hedges	(22)	8	(37)	21
Operating income (loss)	568	533	635	628
B2B
Segment Reporting Information [Line Items]
Revenue	1,209	1,049	2,156	1,882
B2B | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
B2B | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	1,209	1,049	2,156	1,882
Cost of revenue	28	27	66	66
Selling and marketing - direct	752	637	1,329	1,138
Other segment items	98	122	214	243
Adjusted EBITDA	331	263	547	435
Depreciation	(45)	(34)	(89)	(68)
Amortization of intangible assets	0	0
Stock-based compensation	0	0
Legal reserves, occupancy tax and other	0	0
Restructuring and related reorganization charges, excluding stock-based compensation	0	0
Realized (gain) loss on revenue hedges	(30)	7	(38)	11
Operating income (loss)	256	236	420	378
trivago
Segment Reporting Information [Line Items]
Revenue	98	77	183	147
trivago | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	60	51	106	91
trivago | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	158	128	289	238
Cost of revenue	4	4	8	8
Selling and marketing - direct	136	106	247	199
Other segment items	24	23	45	45
Adjusted EBITDA	(6)	(5)	(11)	(14)
Depreciation	(1)	(1)	(2)	(2)
Amortization of intangible assets	0	0
Stock-based compensation	0	0
Legal reserves, occupancy tax and other	0	0
Restructuring and related reorganization charges, excluding stock-based compensation	0	0
Realized (gain) loss on revenue hedges	0	0
Operating income (loss)	$ (7)	$ (6)	$ (13)	$ (16)