Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 2,747	$ 3,558	$ 3,153	$ 2,609	$ 2,559	$ 3,276	$ 2,880	$ 2,508	$ 12,067	$ 11,223	$ 10,060
Intersegment revenue									0	0	0
Adjusted EBITDA									2,134	1,970	1,713
Depreciation									(712)	(676)	(614)
Amortization of intangible assets									(198)	(283)	(275)
Impairment of goodwill									0	(86)	0
Impairment of intangible assets										(42)
Stock-based compensation									(241)	(203)	(149)
Legal reserves, occupancy tax and other									(34)	59	(25)
Restructuring and related reorganization charges									(24)		(17)
Realized (gain) loss on revenue hedges									(22)	(25)	(8)
Operating income (loss)	160	609	265	(131)	96	672	111	(165)	903	714	625
Other expense, net									(128)	(229)	(208)
Income before income taxes									775	485	417
Provision for income taxes									(203)	(87)	(45)
Net income									572	398	372
Net (income) loss attributable to non-controlling interests									(7)	8	6
Net income attributable to Expedia Group, Inc.	$ 76	$ 409	$ 183	$ (103)	$ 17	$ 525	$ 1	$ (137)	565	406	378
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue									(258)	(393)	(414)
Intersegment revenue									(316)	(393)	(414)
Adjusted EBITDA									(795)	(746)	(646)
Depreciation									(172)	(204)	(214)
Amortization of intangible assets									(198)	(283)	(275)
Impairment of goodwill										(86)
Impairment of intangible assets										(42)
Stock-based compensation									(241)	(203)	(149)
Legal reserves, occupancy tax and other									(34)	59	(25)
Restructuring and related reorganization charges									(24)		(17)
Realized (gain) loss on revenue hedges									0	0	0
Operating income (loss)									(1,464)	(1,505)	(1,326)
Corporate & Eliminations | Bodybuilding.com
Segment Reporting Information [Line Items]
Revenue									58
Core OTA
Segment Reporting Information [Line Items]
Revenue									9,427	8,760	7,881
Impairment of goodwill										(86)
Core OTA | Operating Segments
Segment Reporting Information [Line Items]
Revenue									9,427	8,760	7,881
Intersegment revenue									0	0	0
Adjusted EBITDA									2,447	2,305	2,057
Depreciation									(379)	(344)	(310)
Amortization of intangible assets									0	0	0
Impairment of goodwill										0
Impairment of intangible assets										0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0		0
Realized (gain) loss on revenue hedges									(21)	(24)	(8)
Operating income (loss)									2,047	1,937	1,739
trivago
Segment Reporting Information [Line Items]
Revenue									622	691	752
Impairment of goodwill										0
trivago | Operating Segments
Segment Reporting Information [Line Items]
Revenue									938	1,084	1,166
Intersegment revenue									316	393	414
Adjusted EBITDA									85	16	5
Depreciation									(11)	(15)	(9)
Amortization of intangible assets									0	0	0
Impairment of goodwill										0
Impairment of intangible assets										0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0		0
Realized (gain) loss on revenue hedges									0	0	0
Operating income (loss)									74	1	(4)
Vrbo
Segment Reporting Information [Line Items]
Revenue									1,340	1,171	906
Impairment of goodwill										0
Vrbo | Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,340	1,171	906
Intersegment revenue									0	0	0
Adjusted EBITDA									281	288	202
Depreciation									(100)	(66)	(40)
Amortization of intangible assets									0	0	0
Impairment of goodwill										0
Impairment of intangible assets										0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0		0
Realized (gain) loss on revenue hedges									(1)	(1)	0
Operating income (loss)									180	221	162
Egencia
Segment Reporting Information [Line Items]
Revenue									620	601	521
Impairment of goodwill										0
Egencia | Operating Segments
Segment Reporting Information [Line Items]
Revenue									620	601	521
Intersegment revenue									0	0	0
Adjusted EBITDA									116	107	95
Depreciation									(50)	(47)	(41)
Amortization of intangible assets									0	0	0
Impairment of goodwill										0
Impairment of intangible assets										0
Stock-based compensation									0	0	0
Legal reserves, occupancy tax and other									0	0	0
Restructuring and related reorganization charges									0		0
Realized (gain) loss on revenue hedges									0	0	0
Operating income (loss)									$ 66	$ 60	$ 54