Segment Information - Schedule of Operating Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 4,412	$ 4,060	$ 11,186	$ 10,507
Selling and marketing - direct	1,976	1,855	5,653	5,298
Adjusted EBITDA	1,449	1,250	2,653	2,291
Depreciation	(215)	(197)	(635)	(582)
Amortization of intangible assets	(10)	(14)	(32)	(44)
Impairment of intangible assets	0	(33)	0	(33)
Stock-based compensation	(90)	(147)	(293)	(365)
Legal reserves, occupancy tax and other	(86)	(59)	(88)	(100)
Restructuring and related reorganization charges, excluding stock-based compensation	(6)	(6)	(73)	(64)
Realized (gain) loss on revenue hedges	(6)	(32)	(81)	0
Operating income (loss)	1,036	762	1,451	1,103
Other expense, net	95	112	(114)	104
Income before income taxes	1,131	874	1,337	1,207
Provision for income taxes	(167)	(190)	(248)	(284)
Net income	964	684	1,089	923
Net loss attributable to non-controlling interests	(5)	0	0	12
Net income attributable to Expedia Group, Inc.	959	684	1,089	935
Corporate
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	(57)	(58)	(163)	(149)
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(57)	(58)	(163)	(149)
Selling and marketing - direct	(57)	(58)	(163)	(149)
Other segment items	144	130	421	379
Adjusted EBITDA	(144)	(130)	(421)	(379)
Depreciation	(29)	(26)	(85)	(79)
Amortization of intangible assets	(10)	(14)	(32)	(44)
Impairment of intangible assets		(33)		(33)
Stock-based compensation	(90)	(147)	(293)	(365)
Legal reserves, occupancy tax and other	(86)	(59)	(88)	(100)
Restructuring and related reorganization charges, excluding stock-based compensation	(6)	(6)	(73)	(64)
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	(365)	(415)	(992)	(1,064)
B2C
Segment Reporting Information [Line Items]
Revenue	2,883	2,780	7,318	7,198
B2C | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
B2C | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	2,883	2,780	7,318	7,198
Cost of revenue	347	359	999	997
Selling and marketing - direct	1,032	1,072	3,239	3,269
Other segment items	330	321	961	1,035
Adjusted EBITDA	1,174	1,028	2,119	1,897
Depreciation	(135)	(133)	(408)	(395)
Amortization of intangible assets	0	0
Impairment of intangible assets		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	6	(16)	(31)	5
Operating income (loss)	1,045	879	1,680	1,507
B2B
Segment Reporting Information [Line Items]
Revenue	1,392	1,178	3,548	3,060
B2B | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
B2B | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	1,392	1,178	3,548	3,060
Cost of revenue	18	21	84	87
Selling and marketing - direct	855	721	2,184	1,859
Other segment items	117	98	331	341
Adjusted EBITDA	402	338	949	773
Depreciation	(49)	(37)	(138)	(104)
Amortization of intangible assets	0	0
Impairment of intangible assets		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	(12)	(16)	(50)	(5)
Operating income (loss)	341	285	761	664
trivago
Segment Reporting Information [Line Items]
Revenue	137	102	320	249
trivago | Intersegment revenue
Segment Reporting Information [Line Items]
Revenue	57	58	163	149
trivago | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	194	160	483	398
Cost of revenue	6	5	14	13
Selling and marketing - direct	146	120	393	319
Other segment items	25	21	70	66
Adjusted EBITDA	17	14	6	0
Depreciation	(2)	(1)	(4)	(4)
Amortization of intangible assets	0	0
Impairment of intangible assets		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)	$ 15	$ 13	$ 2	$ (4)