- Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 3,558	$ 3,276	$ 9,320	$ 8,664
Intersegment revenue	0	0	0	0
Adjusted EBITDA	912	912	1,656	1,499
Depreciation	(178)	(171)	(530)	(507)
Amortization of intangible assets	(50)	(71)	(154)	(215)
Impairment of goodwill	0	0	0	(61)
Stock-based compensation	(60)	(54)	(175)	(154)
Legal reserves, occupancy tax and other	(11)	78	(25)	74
Restructuring and related reorganization charges	(2)		(16)
Realized (gain) loss on revenue hedges	(2)	(22)	(13)	(18)
Operating income (loss)	609	672	743	618
Other expense, net	(48)	(60)	(88)	(189)
Income before income taxes	561	612	655	429
Provision for income taxes	(154)	(81)	(161)	(56)
Net income	407	531	494	373
Net (income) loss attributable to non-controlling interests	2	(6)	(5)	16
Net income attributable to Expedia Group, Inc.	409	525	489	389
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(65)	(95)	(238)	(323)
Intersegment revenue	(89)	(95)	(262)	(323)
Adjusted EBITDA	(199)	(184)	(576)	(547)
Depreciation	(42)	(50)	(129)	(159)
Amortization of intangible assets	(50)	(71)	(154)	(215)
Impairment of goodwill				(61)
Stock-based compensation	(60)	(54)	(175)	(154)
Legal reserves, occupancy tax and other	(11)	78	(25)	74
Restructuring and related reorganization charges	(2)		(16)
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	(364)	(281)	(1,075)	(1,062)
Corporate & Eliminations | Bodybuilding.com
Segment Reporting Information [Line Items]
Revenue	24		24
Core OTA
Segment Reporting Information [Line Items]
Revenue	2,732	2,527	7,249	6,706
Core OTA | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	2,732	2,527	7,249	6,706
Intersegment revenue	0	0	0	0
Adjusted EBITDA	865	837	1,832	1,721
Depreciation	(95)	(88)	(281)	(256)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill				0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges	0		0
Realized (gain) loss on revenue hedges	(1)	(21)	(12)	(17)
Operating income (loss)	769	728	1,539	1,448
trivago
Segment Reporting Information [Line Items]
Revenue	190	200	505	571
trivago | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	279	295	767	894
Intersegment revenue	89	95	262	323
Adjusted EBITDA	12	31	56	(17)
Depreciation	(3)	(4)	(9)	(11)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill				0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges	0		0
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	9	27	47	(28)
Vrbo
Segment Reporting Information [Line Items]
Revenue	467	410	1,081	941
Vrbo | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	467	410	1,081	941
Intersegment revenue	0	0	0	0
Adjusted EBITDA	215	209	259	266
Depreciation	(26)	(17)	(73)	(46)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill				0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges	0		0
Realized (gain) loss on revenue hedges	(1)	(1)	(1)	(1)
Operating income (loss)	188	191	185	219
Egencia
Segment Reporting Information [Line Items]
Revenue	145	139	461	446
Egencia | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	145	139	461	446
Intersegment revenue	0	0	0	0
Adjusted EBITDA	19	19	85	76
Depreciation	(12)	(12)	(38)	(35)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill				0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges	0		0
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	$ 7	$ 7	$ 47	$ 41