Segment Information - Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 33,982	$ 1,126
Investment in Expedia		927
Capital expenditures	125	21	$ 18
Operating Segments | Expedia
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	33,746
Capital expenditures	111
Operating Segments | Vitalize
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	182	150
Capital expenditures	14	21
Operating Segments | Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 54	976
Investment in Expedia		$ 927