Segment Information - Other Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 35,620		$ 33,982
Capital expenditures	170	$ 4
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	35,620
Capital expenditures	170
Operating Segments | Expedia
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	35,383
Capital expenditures	167
Operating Segments | Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	237
Capital expenditures	$ 3