Guarantor and Non-Guarantor Supplemental Financial Information - Schedule of Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Condensed Income Statements, Captions [Line Items]
Revenue	$ 2,880	$ 2,586		$ 5,388		$ 4,775
Cost of revenue	498	439	[1]	985	[1]	861	[1]
Selling and marketing	1,541	1,443	[1]	3,057	[1]	2,713	[1]
Technology and content	400	343	[1]	796	[1]	665	[1]
General and administrative	196	179	[1]	395	[1]	337	[1]
Amortization of intangible assets	72	66		144		133
Impairment of goodwill	61	0		61		0
Legal reserves, occupancy tax and other	1	3		4		24
Restructuring and related reorganization charges	0	10		0		12
Intercompany (income) expense, net	0	0		0		0
Operating income (loss)	111	103		(54)		30
Equity in pre-tax earnings of consolidated subsidiaries	0	0		0		0
Other, net	(125)	(46)		(129)		(104)
Total other expense, net	(125)	(46)		(129)		(104)
Income (loss) before income taxes	(14)	57		(183)		(74)
Provision for income taxes	5	(3)		25		44
Net income (loss)	(9)	54		(158)		(30)
Net (income) loss attributable to noncontrolling interests	10	3		22		1
Net income (loss) attributable to Expedia, Inc.	1	57		(136)		(29)
Comprehensive income (loss) attributable to Expedia, Inc.	(65)	120		(175)		63
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			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 (loss)	0	0		0		0
Equity in pre-tax earnings of consolidated subsidiaries	38	83		(59)		23
Other, net	(48)	(43)		(100)		(84)
Total other expense, net	(10)	40		(159)		(61)
Income (loss) before income taxes	(10)	40		(159)		(61)
Provision for income taxes	11	17		23		32
Net income (loss)	1	57		(136)		(29)
Net (income) loss attributable to noncontrolling interests	0	0		0		0
Net income (loss) attributable to Expedia, Inc.	1	57		(136)		(29)
Comprehensive income (loss) attributable to Expedia, Inc.	(65)	120		(175)		63
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	2,229	1,946		4,140		3,647
Cost of revenue	366	335		732		670
Selling and marketing	1,112	997		2,160		1,907
Technology and content	280	250		560		487
General and administrative	128	114		246		220
Amortization of intangible assets	45	46		90		92
Impairment of goodwill	0			0
Legal reserves, occupancy tax and other	0	3		3		24
Restructuring and related reorganization charges		3				4
Intercompany (income) expense, net	231	220		415		386
Operating income (loss)	67	(22)		(66)		(143)
Equity in pre-tax earnings of consolidated subsidiaries	35	117		19		169
Other, net	(61)	(13)		(9)		(45)
Total other expense, net	(26)	104		10		124
Income (loss) before income taxes	41	82		(56)		(19)
Provision for income taxes	(2)	8		1		52
Net income (loss)	39	90		(55)		33
Net (income) loss attributable to noncontrolling interests	0	0		1		0
Net income (loss) attributable to Expedia, Inc.	39	90		(54)		33
Comprehensive income (loss) attributable to Expedia, Inc.	(59)	183		(110)		162
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Income Statements, Captions [Line Items]
Revenue	758	752		1,479		1,345
Cost of revenue	137	109		263		199
Selling and marketing	531	553		1,118		1,015
Technology and content	120	93		236		178
General and administrative	68	65		149		117
Amortization of intangible assets	27	20		54		41
Impairment of goodwill	61			61
Legal reserves, occupancy tax and other	1	0		1		0
Restructuring and related reorganization charges		7				8
Intercompany (income) expense, net	(231)	(220)		(415)		(386)
Operating income (loss)	44	125		12		173
Equity in pre-tax earnings of consolidated subsidiaries	0	0		0		0
Other, net	(16)	10		(20)		25
Total other expense, net	(16)	10		(20)		25
Income (loss) before income taxes	28	135		(8)		198
Provision for income taxes	(4)	(28)		1		(40)
Net income (loss)	24	107		(7)		158
Net (income) loss attributable to noncontrolling interests	10	3		21		1
Net income (loss) attributable to Expedia, Inc.	34	110		14		159
Comprehensive income (loss) attributable to Expedia, Inc.	(63)	206		(39)		290
Eliminations
Condensed Income Statements, Captions [Line Items]
Revenue	(107)	(112)		(231)		(217)
Cost of revenue	(5)	(5)		(10)		(8)
Selling and marketing	(102)	(107)		(221)		(209)
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			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 (loss)	0	0		0		0
Equity in pre-tax earnings of consolidated subsidiaries	(73)	(200)		40		(192)
Other, net	0	0		0		0
Total other expense, net	(73)	(200)		40		(192)
Income (loss) before income taxes	(73)	(200)		40		(192)
Provision for income taxes	0	0		0		0
Net income (loss)	(73)	(200)		40		(192)
Net (income) loss attributable to noncontrolling interests	0	0		0		0
Net income (loss) attributable to Expedia, Inc.	(73)	(200)		40		(192)
Comprehensive income (loss) attributable to Expedia, Inc.	$ 122	$ (389)		$ 149		$ (452)

[1] Includes stock-based compensation as follows: Cost of revenue $3 million, $3 million, $5 million, and $6 million; Selling and marketing $12 million, $10 million, $23 million, and $21 million; Technology and content $16 million, $15 million, $31 million, and $28 million; General and administrative $19 million, $22 million, $41 million, and $42 million.