Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Statement of Operations 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
Condensed Income Statements, Captions [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
Costs and expenses:
Cost of revenue	[1]									2,163	1,965	1,757
Selling and marketing	[1]									6,135	5,767	5,298
Technology and content	[1]									1,763	1,617	1,387
General and administrative	[1]									847	808	676
Amortization of intangible assets										198	283	275
Impairment of goodwill										0	86	0
Impairment of intangible assets										0	42	0
Legal reserves, occupancy tax and other										34	(59)	25
Restructuring and related reorganization charges										24	0	17
Intercompany (income) expense, net										0	0	0
Operating income (loss)		160	609	265	(131)	96	672	111	(165)	903	714	625
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										0	0	0
Other, net										(128)	(229)	(208)
Total 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 noncontrolling interests										(7)	8	6
Net income attributable to Expedia, Inc.		$ 76	$ 409	$ 183	$ (103)	$ 17	$ 525	$ 1	$ (137)	565	406	378
Comprehensive income attributable to Expedia, Inc.										568	338	509
Reportable Legal Entities | Parent
Condensed Income Statements, Captions [Line Items]
Revenue										0	0	0
Costs and expenses:
Cost of revenue										0	0	0
Selling and marketing										0	0	0
Technology and content										0	0	0
General and administrative										0	0	0
Amortization of intangible assets										0	0	0
Impairment of goodwill											0
Impairment of intangible assets											0
Legal reserves, occupancy tax and other										0	0	0
Restructuring and related reorganization charges										0		0
Intercompany (income) expense, net										2	0	0
Operating income (loss)										(2)	0	0
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										702	549	493
Other, net										(176)	(187)	(179)
Total other expense, net										526	362	314
Income before income taxes										524	362	314
Provision for income taxes										41	44	64
Net income										565	406	378
Net income (loss) attributable to noncontrolling interests										0	0	0
Net income attributable to Expedia, Inc.										565	406	378
Comprehensive income attributable to Expedia, Inc.										568	338	509
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue										9,463	8,650	7,662
Costs and expenses:
Cost of revenue										1,569	1,436	1,343
Selling and marketing										4,666	4,153	3,715
Technology and content										1,247	1,143	991
General and administrative										557	515	409
Amortization of intangible assets										117	174	182
Impairment of goodwill											0
Impairment of intangible assets											42
Legal reserves, occupancy tax and other										16	(60)	25
Restructuring and related reorganization charges										13		5
Intercompany (income) expense, net										856	808	695
Operating income (loss)										422	439	297
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										372	209	336
Other, net										39	(81)	(60)
Total other expense, net										411	128	276
Income before income taxes										833	567	573
Provision for income taxes										(129)	(12)	(67)
Net income										704	555	506
Net income (loss) attributable to noncontrolling interests										3	2	1
Net income attributable to Expedia, Inc.										707	557	507
Comprehensive income attributable to Expedia, Inc.										696	459	698
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue										2,929	2,973	2,817
Costs and expenses:
Cost of revenue										616	550	431
Selling and marketing										1,772	1,993	1,985
Technology and content										516	474	396
General and administrative										290	293	267
Amortization of intangible assets										81	109	93
Impairment of goodwill											86
Impairment of intangible assets											0
Legal reserves, occupancy tax and other										18	1	0
Restructuring and related reorganization charges										11		12
Intercompany (income) expense, net										(858)	(808)	(695)
Operating income (loss)										483	275	328
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										0	0	0
Other, net										9	39	31
Total other expense, net										9	39	31
Income before income taxes										492	314	359
Provision for income taxes										(115)	(119)	(42)
Net income										377	195	317
Net income (loss) attributable to noncontrolling interests										(10)	6	5
Net income attributable to Expedia, Inc.										367	201	322
Comprehensive income attributable to Expedia, Inc.										359	103	564
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue										(325)	(400)	(419)
Costs and expenses:
Cost of revenue										(22)	(21)	(17)
Selling and marketing										(303)	(379)	(402)
Technology and content										0	0	0
General and administrative										0	0	0
Amortization of intangible assets										0	0	0
Impairment of goodwill											0
Impairment of intangible assets											0
Legal reserves, occupancy tax and other										0	0	0
Restructuring and related reorganization charges										0		0
Intercompany (income) expense, net										0	0	0
Operating income (loss)										0	0	0
Other income (expense):
Equity in pre-tax earnings of consolidated subsidiaries										(1,074)	(758)	(829)
Other, net										0	0	0
Total other expense, net										(1,074)	(758)	(829)
Income before income taxes										(1,074)	(758)	(829)
Provision for income taxes										0	0	0
Net income										(1,074)	(758)	(829)
Net income (loss) attributable to noncontrolling interests										0	0	0
Net income attributable to Expedia, Inc.										(1,074)	(758)	(829)
Comprehensive income attributable to Expedia, Inc.										$ (1,055)	$ (562)	$ (1,262)

[1] (1) Includes stock-based compensation as follows:           Cost of revenue $ 12
  $ 11
  $ 10
Selling and marketing 45
  44
  40
Technology and content 74
  61
  55
General and administrative 110
  87
  44