Segment Information - Performance Measures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, Net	$ 2,381	$ 3,029	$ 2,646	$ 2,230	$ 1,256	$ 97	$ 112	$ 116	$ 10,286	$ 1,581	$ 465
Adjusted OIBDA									1,638	146	33
Expedia | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, Net									9,994	1,170
Adjusted OIBDA									1,640	133
Corporate and Other | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue, Net									292	411	465
Adjusted OIBDA									$ (2)	$ 13	$ 33