Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]
Revenue	$ 3,276	$ 2,966		$ 8,664		$ 7,741
Cost of revenue	504	459	[1]	1,489	[1]	1,320	[1]
Selling and marketing	1,501	1,461	[1]	4,558	[1]	4,174	[1]
Technology and content	404	350	[1]	1,200	[1]	1,015	[1]
General and administrative	202	141	[1]	597	[1]	478	[1]
Amortization of intangible assets	71	71		215		204
Impairment of goodwill	0	0		61		0
Legal reserves, occupancy tax and other	(78)	(1)		(74)		23
Restructuring and related reorganization charges	0	4		0		16
Intercompany (income) expense, net	0	0		0		0
Operating income	672	481		618		511
Equity in pre-tax earnings of consolidated subsidiaries	0	0		0		0
Other, net	(60)	(66)		(189)		(170)
Total other expense, net	(60)	(66)		(189)		(170)
Income (loss) before income taxes	612	415		429		341
Provision for income taxes	(81)	(66)		(56)		(22)
Net income (loss)	531	349		373		319
Net (income) loss attributable to noncontrolling interests	(6)	3		16		4
Net income (loss) attributable to Expedia, Inc.	525	352		389		323
Comprehensive income (loss) attributable to Expedia, Inc.	514	417		339		480
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	560	380		501		403
Other, net	(46)	(44)		(146)		(128)
Total other expense, net	514	336		355		275
Income (loss) before income taxes	514	336		355		275
Provision for income taxes	11	16		34		48
Net income (loss)	525	352		389		323
Net (income) loss attributable to noncontrolling interests	0	0		0		0
Net income (loss) attributable to Expedia, Inc.	525	352		389		323
Comprehensive income (loss) attributable to Expedia, Inc.	514	417		339		480
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	2,503	2,227		6,643		5,874
Cost of revenue	362	348		1,094		1,018
Selling and marketing	1,096	1,012		3,256		2,919
Technology and content	287	250		847		737
General and administrative	129	72		375		292
Amortization of intangible assets	44	45		134		137
Impairment of goodwill				0
Legal reserves, occupancy tax and other	(78)	(1)		(75)		23
Restructuring and related reorganization charges		1				5
Intercompany (income) expense, net	239	205		654		591
Operating income	424	295		358		152
Equity in pre-tax earnings of consolidated subsidiaries	204	162		223		331
Other, net	(13)	(32)		(22)		(77)
Total other expense, net	191	130		201		254
Income (loss) before income taxes	615	425		559		406
Provision for income taxes	(55)	(43)		(54)		9
Net income (loss)	560	382		505		415
Net (income) loss attributable to noncontrolling interests	1	0		2		0
Net income (loss) attributable to Expedia, Inc.	561	382		507		415
Comprehensive income (loss) attributable to Expedia, Inc.	545	462		435		624
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	869	857		2,348		2,202
Cost of revenue	147	116		410		315
Selling and marketing	496	562		1,614		1,577
Technology and content	117	100		353		278
General and administrative	73	69		222		186
Amortization of intangible assets	27	26		81		67
Impairment of goodwill				61
Legal reserves, occupancy tax and other	0	0		1		0
Restructuring and related reorganization charges		3				11
Intercompany (income) expense, net	(239)	(205)		(654)		(591)
Operating income	248	186		260		359
Equity in pre-tax earnings of consolidated subsidiaries	0	0		0		0
Other, net	(1)	10		(21)		35
Total other expense, net	(1)	10		(21)		35
Income (loss) before income taxes	247	196		239		394
Provision for income taxes	(37)	(39)		(36)		(79)
Net income (loss)	210	157		203		315
Net (income) loss attributable to noncontrolling interests	(7)	3		14		4
Net income (loss) attributable to Expedia, Inc.	203	160		217		319
Comprehensive income (loss) attributable to Expedia, Inc.	186	261		147		551
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue	(96)	(118)		(327)		(335)
Cost of revenue	(5)	(5)		(15)		(13)
Selling and marketing	(91)	(113)		(312)		(322)
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	(764)	(542)		(724)		(734)
Other, net	0	0		0		0
Total other expense, net	(764)	(542)		(724)		(734)
Income (loss) before income taxes	(764)	(542)		(724)		(734)
Provision for income taxes	0	0		0		0
Net income (loss)	(764)	(542)		(724)		(734)
Net (income) loss attributable to noncontrolling interests	0	0		0		0
Net income (loss) attributable to Expedia, Inc.	(764)	(542)		(724)		(734)
Comprehensive income (loss) attributable to Expedia, Inc.	$ (731)	$ (723)		$ (582)		$ (1,175)

[1] Includes stock-based compensation as follows: Cost of revenue $3 million, $2 million, $8 million, and $8 million; Selling and marketing $11 million, $10 million, $34 million, and $31 million; Technology and content $15 million, $14 million, $46 million, and $42 million; General and administrative $25 million, $(19) million, $66 million, and $23 million.