Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 1,504	$ 3,558	$ 4,279	$ 9,320
Intersegment revenue	0	0	0	0
Adjusted EBITDA	304	912	(208)	1,656
Depreciation	(183)	(178)	(559)	(530)
Amortization of intangible assets	(37)	(50)	(122)	(154)
Impairment of goodwill	(14)	0	(799)	0
Impairment of intangible assets	(41)	0	(172)	0
Stock-based compensation	(47)	(60)	(156)	(175)
Legal reserves, occupancy tax and other	(2)	(11)	11	(25)
Restructuring and related reorganization charges	(78)	(2)	(206)	(16)
Realized (gain) loss on revenue hedges	(15)	(2)	(45)	(13)
Operating income (loss)	(113)	609	(2,256)	743
Other expense, net	(111)	(48)	(400)	(88)
Income before income taxes	(224)	561	(2,656)	655
Provision for income taxes	24	(154)	319	(161)
Net income (loss)	(200)	407	(2,337)	494
Net (income) loss attributable to non-controlling interests	8	2	108	(5)
Net income (loss) attributable to Expedia Group, Inc.	(192)	409	(2,229)	489
Preferred stock dividend	(29)	0	(46)	0
Net income (loss) attributable to Expedia Group, Inc. common stockholders	(221)	409	(2,275)	489
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(15)	(65)	(10)	(238)
Intersegment revenue	(15)	(89)	(69)	(262)
Adjusted EBITDA	(80)	(125)	(292)	(370)
Depreciation	(13)	(20)	(53)	(57)
Amortization of intangible assets	(37)	(50)	(122)	(154)
Impairment of goodwill	(14)		(799)
Impairment of intangible assets	(41)		(172)
Stock-based compensation	(47)	(60)	(156)	(175)
Legal reserves, occupancy tax and other	(2)	(11)	11	(25)
Restructuring and related reorganization charges	(78)	(2)	(206)	(16)
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	(312)	(268)	(1,789)	(797)
Corporate & Eliminations | Bodybuilding.com
Segment Reporting Information [Line Items]
Revenue	0	24	59	24
Retail
Segment Reporting Information [Line Items]
Revenue	1,246	2,613	3,291	6,847
Retail | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	1,246	2,613	3,291	6,847
Intersegment revenue	0	0	0	0
Adjusted EBITDA	429	876	248	1,619
Depreciation	(136)	(128)	(400)	(383)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill	0		0
Impairment of intangible assets	0		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	0	0
Realized (gain) loss on revenue hedges	(15)	4	(42)	(2)
Operating income (loss)	278	752	(194)	1,234
B2B
Segment Reporting Information [Line Items]
Revenue	203	731	756	1,944
B2B | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	203	731	756	1,944
Intersegment revenue	0	0	0	0
Adjusted EBITDA	(52)	149	(154)	351
Depreciation	(30)	(27)	(96)	(81)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill	0		0
Impairment of intangible assets	0		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	0	0
Realized (gain) loss on revenue hedges	0	(6)	(3)	(11)
Operating income (loss)	(82)	116	(253)	259
trivago
Segment Reporting Information [Line Items]
Revenue	55	190	173	505
trivago | Reportable Segments
Segment Reporting Information [Line Items]
Revenue	70	279	242	767
Intersegment revenue	15	89	69	262
Adjusted EBITDA	7	12	(10)	56
Depreciation	(4)	(3)	(10)	(9)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill	0		0
Impairment of intangible assets	0		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	0	0
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	$ 3	$ 9	$ (20)	$ 47