Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Statement of Operations (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Income Statements, Captions [Line Items]
Revenue		$ 3,558	$ 3,276	$ 9,320	$ 8,664
Cost of revenue	[1]	569	504	1,604	1,489
Selling and marketing	[1]	1,660	1,501	4,852	4,558
Technology and content	[1]	440	404	1,304	1,200
General and administrative	[1]	217	202	622	597
Amortization of intangible assets		50	71	154	215
Impairment of goodwill		0	0	0	61
Legal reserves, occupancy tax and other		11	(78)	25	(74)
Restructuring and related reorganization charges		2	0	16	0
Intercompany (income) expense, net		0	0	0	0
Operating income		609	672	743	618
Equity in pre-tax earnings of consolidated subsidiaries		0	0	0	0
Other, net		(48)	(60)	(88)	(189)
Total other expense, net		(48)	(60)	(88)	(189)
Income (loss) before income taxes		561	612	655	429
Provision for income taxes		(154)	(81)	(161)	(56)
Net income (loss)		407	531	494	373
Net (income) loss attributable to noncontrolling interests		2	(6)	(5)	16
Net income attributable to Expedia Group, Inc.		409	525	489	389
Comprehensive income (loss) attributable to Expedia, Inc.		367	514	451	339
Reportable Legal Entities | Parent
Condensed Income Statements, Captions [Line Items]
Revenue		0	0	0	0
Cost of revenue		0	0	0	0
Selling and marketing		0	0	0	0
Technology and content		0	0	0	0
General and administrative		0	0	0	0
Amortization of intangible assets		0	0	0	0
Impairment of goodwill					0
Legal reserves, occupancy tax and other		0	0	0	0
Restructuring and related reorganization charges		0		0
Intercompany (income) expense, net		0	0	0	0
Operating income		0	0	0	0
Equity in pre-tax earnings of consolidated subsidiaries		439	560	582	501
Other, net		(40)	(46)	(122)	(146)
Total other expense, net		399	514	460	355
Income (loss) before income taxes		399	514	460	355
Provision for income taxes		10	11	29	34
Net income (loss)		409	525	489	389
Net (income) loss attributable to noncontrolling interests		0	0	0	0
Net income attributable to Expedia Group, Inc.		409	525	489	389
Comprehensive income (loss) attributable to Expedia, Inc.		367	514	451	339
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue		2,733	2,503	7,274	6,643
Cost of revenue		408	362	1,162	1,094
Selling and marketing		1,258	1,096	3,675	3,256
Technology and content		309	287	914	847
General and administrative		140	129	400	375
Amortization of intangible assets		30	44	92	134
Impairment of goodwill					0
Legal reserves, occupancy tax and other		3	(78)	17	(75)
Restructuring and related reorganization charges		0		0
Intercompany (income) expense, net		250	239	661	654
Operating income		335	424	353	358
Equity in pre-tax earnings of consolidated subsidiaries		170	204	257	223
Other, net		46	(13)	84	(22)
Total other expense, net		216	191	341	201
Income (loss) before income taxes		551	615	694	559
Provision for income taxes		(111)	(55)	(109)	(54)
Net income (loss)		440	560	585	505
Net (income) loss attributable to noncontrolling interests		1	1	2	2
Net income attributable to Expedia Group, Inc.		441	561	587	507
Comprehensive income (loss) attributable to Expedia, Inc.		376	545	522	435
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue		916	869	2,313	2,348
Cost of revenue		166	147	459	410
Selling and marketing		488	496	1,427	1,614
Technology and content		131	117	390	353
General and administrative		77	73	222	222
Amortization of intangible assets		20	27	62	81
Impairment of goodwill					61
Legal reserves, occupancy tax and other		8	0	8	1
Restructuring and related reorganization charges		2		16
Intercompany (income) expense, net		(250)	(239)	(661)	(654)
Operating income		274	248	390	260
Equity in pre-tax earnings of consolidated subsidiaries		0	0	0	0
Other, net		(54)	(1)	(50)	(21)
Total other expense, net		(54)	(1)	(50)	(21)
Income (loss) before income taxes		220	247	340	239
Provision for income taxes		(53)	(37)	(81)	(36)
Net income (loss)		167	210	259	203
Net (income) loss attributable to noncontrolling interests		1	(7)	(7)	14
Net income attributable to Expedia Group, Inc.		168	203	252	217
Comprehensive income (loss) attributable to Expedia, Inc.		105	186	189	147
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue		(91)	(96)	(267)	(327)
Cost of revenue		(5)	(5)	(17)	(15)
Selling and marketing		(86)	(91)	(250)	(312)
Technology and content		0	0	0	0
General and administrative		0	0	0	0
Amortization of intangible assets		0	0	0	0
Impairment of goodwill					0
Legal reserves, occupancy tax and other		0	0	0	0
Restructuring and related reorganization charges		0		0
Intercompany (income) expense, net		0	0	0	0
Operating income		0	0	0	0
Equity in pre-tax earnings of consolidated subsidiaries		(609)	(764)	(839)	(724)
Other, net		0	0	0	0
Total other expense, net		(609)	(764)	(839)	(724)
Income (loss) before income taxes		(609)	(764)	(839)	(724)
Provision for income taxes		0	0	0	0
Net income (loss)		(609)	(764)	(839)	(724)
Net (income) loss attributable to noncontrolling interests		0	0	0	0
Net income attributable to Expedia Group, Inc.		(609)	(764)	(839)	(724)
Comprehensive income (loss) attributable to Expedia, Inc.		$ (481)	$ (731)	$ (711)	$ (582)

[1] (1) Includes stock-based compensation as follows:               Cost of revenue $ 3
  $ 3
  $ 9
  $ 8
Selling and marketing 11
  11
  34
  34
Technology and content 18
  15
  56
  46
General and administrative 28
  25
  76
  66