Quarterly Financial Information - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 2,559	$ 3,276	$ 2,880	$ 2,508	$ 2,319	$ 2,966	$ 2,586	$ 2,189	$ 11,223	$ 10,060	$ 8,774
Operating income (loss)	96	672	111	(165)	114	481	103	(73)	714	625	462
Net income attributable to Expedia, Inc.	$ 17	$ 525	$ 1	$ (137)	$ 55	$ 352	$ 57	$ (86)	$ 406	$ 378	$ 282
Basic (in dollars per share)	$ 0.11	$ 3.51	$ 0.01	$ (0.91)	$ 0.36	$ 2.32	$ 0.37	$ (0.57)	$ 2.71	$ 2.49	$ 1.87
Diluted (in dollars per share)	$ 0.11	$ 3.43	$ 0.01	$ (0.91)	$ 0.35	$ 2.23	$ 0.36	$ (0.57)	$ 2.65	$ 2.42	$ 1.82
Goodwill [Line Items]
Impairment of goodwill									$ 86	$ 0	$ 0
Impairment of intangible assets									42	0	35
Core OTA
Quarterly Financial Information Disclosure [Abstract]
Revenue									8,760	$ 7,881	$ 7,084
Goodwill [Line Items]
Impairment of goodwill									86
Impairment of intangible assets	$ 42
Nonrecurring Basis | Reporting Unit Within Core Online Travel Companies [Member]
Goodwill [Line Items]
Impairment of goodwill	$ 25		$ 61						$ 86