Segment Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 3,276	$ 2,966	$ 8,664	$ 7,741
Intersegment revenue	0	0	0	0
Adjusted EBITDA	912	709	1,499	1,310
Depreciation	(171)	(156)	(507)	(449)
Amortization of intangible assets	(71)	(71)	(215)	(204)
Impairment of goodwill	0	0	(61)	0
Stock-based compensation	(54)	(7)	(154)	(104)
Legal reserves, occupancy tax and other	78	1	74	(23)
Restructuring and related reorganization charges		(4)		(16)
Realized (gain) loss on revenue hedges	(22)	9	(18)	(3)
Operating income (loss)	672	481	618	511
Other expense, net	(60)	(66)	(189)	(170)
Income before income taxes	612	415	429	341
Provision for income taxes	(81)	(66)	(56)	(22)
Net income	531	349	373	319
Net (income) loss attributable to non-controlling interests	(6)	3	16	4
Net income (loss) attributable to Expedia, Inc.	525	352	389	323
Core OTA
Segment Reporting Information [Line Items]
Revenue	2,527	2,314	6,706	6,022
trivago
Segment Reporting Information [Line Items]
Revenue	200	221	571	621
HomeAway
Segment Reporting Information [Line Items]
Revenue	410	305	941	714
Egencia
Segment Reporting Information [Line Items]
Revenue	139	126	446	384
Reportable Segments | Core OTA
Segment Reporting Information [Line Items]
Revenue	2,527	2,314	6,706	6,022
Intersegment revenue	0	0	0	0
Adjusted EBITDA	837	734	1,721	1,523
Depreciation	(88)	(79)	(256)	(226)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill			0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges		0		0
Realized (gain) loss on revenue hedges	(21)	9	(17)	(3)
Operating income (loss)	728	664	1,448	1,294
Reportable Segments | trivago
Segment Reporting Information [Line Items]
Revenue	295	338	894	952
Intersegment revenue	95	117	323	331
Adjusted EBITDA	31	(8)	(17)	14
Depreciation	(4)	(2)	(11)	(6)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill			0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges		0		0
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	27	(10)	(28)	8
Reportable Segments | HomeAway
Segment Reporting Information [Line Items]
Revenue	410	305	941	714
Intersegment revenue	0	0	0	0
Adjusted EBITDA	209	126	266	171
Depreciation	(17)	(11)	(46)	(27)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill			0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges		0		0
Realized (gain) loss on revenue hedges	(1)	0	(1)	0
Operating income (loss)	191	115	219	144
Reportable Segments | Egencia
Segment Reporting Information [Line Items]
Revenue	139	126	446	384
Intersegment revenue	0	0	0	0
Adjusted EBITDA	19	20	76	76
Depreciation	(12)	(11)	(35)	(30)
Amortization of intangible assets	0	0	0	0
Impairment of goodwill			0
Stock-based compensation	0	0	0	0
Legal reserves, occupancy tax and other	0	0	0	0
Restructuring and related reorganization charges		0		0
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	7	9	41	46
Corporate & Eliminations
Segment Reporting Information [Line Items]
Revenue	(95)	(117)	(323)	(331)
Intersegment revenue	(95)	(117)	(323)	(331)
Adjusted EBITDA	(184)	(163)	(547)	(474)
Depreciation	(50)	(53)	(159)	(160)
Amortization of intangible assets	(71)	(71)	(215)	(204)
Impairment of goodwill			(61)
Stock-based compensation	(54)	(7)	(154)	(104)
Legal reserves, occupancy tax and other	78	1	74	(23)
Restructuring and related reorganization charges		(4)		(16)
Realized (gain) loss on revenue hedges	0	0	0	0
Operating income (loss)	$ (281)	$ (297)	$ (1,062)	$ (981)