Segment Information - Other Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 36,952		$ 33,982
Capital expenditures	532	$ 10
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	36,952
Capital expenditures	532
Operating Segments | Expedia
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	36,678
Capital expenditures	526
Operating Segments | Corporate and Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	274
Capital expenditures	$ 6