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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 2,880	$ 2,586	$ 5,388	$ 4,775
Deferred merchant bookings	6,106		6,106			$ 3,219
Deferred revenue	460		460			$ 326
Lodging
Disaggregation of Revenue [Line Items]
Revenue	1,992		3,604
Air
Disaggregation of Revenue [Line Items]
Revenue	223		465
Advertising and media
Disaggregation of Revenue [Line Items]
Revenue	274		556
Other
Disaggregation of Revenue [Line Items]
Revenue	391		763
Sales Through Intermediaries \| Merchant
Disaggregation of Revenue [Line Items]
Revenue	1,532		2,866
Sales Through Intermediaries \| Agency
Disaggregation of Revenue [Line Items]
Revenue	777		1,435
Sales Through Intermediaries \| Advertising and media
Disaggregation of Revenue [Line Items]
Revenue	274		556
Sales Through Intermediaries \| HomeAway
Disaggregation of Revenue [Line Items]
Revenue	297		531
Deferred Merchant Bookings
Disaggregation of Revenue [Line Items]
Deferred merchant bookings	5,443		5,443		$ 3,219
Deferred merchant bookings recognized during period			2,687
Revenue recognized during period			391
Deferred Loyalty Rewards
Disaggregation of Revenue [Line Items]
Deferred merchant bookings	663		663		619
Revenue recognized during period			$ 324
Deferred Loyalty Rewards \| Minimum
Disaggregation of Revenue [Line Items]
Recognition period			1 year
Deferred Loyalty Rewards \| Maximum
Disaggregation of Revenue [Line Items]
Recognition period			2 years
Deferred Revenue
Disaggregation of Revenue [Line Items]
Revenue recognized during period			$ 230
Deferred revenue	$ 460		$ 460		$ 326