Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Segment Reporting Information [Line Items]
Total net transaction revenues	$ 2,077	$ 1,908	$ 4,100	$ 3,723
Total marketing services and other revenues	563	511	1,120	999
Total net revenues	2,640	2,419	5,220	4,722
Marketplace
Segment Reporting Information [Line Items]
Total net transaction revenues	1,837	1,679	3,629	3,288
Total marketing services and other revenues	298	283	608	566
StubHub
Segment Reporting Information [Line Items]
Total net transaction revenues	240	229	471	435
Classifieds
Segment Reporting Information [Line Items]
Total marketing services and other revenues	259	219	505	418
StubHub, Corporate and other
Segment Reporting Information [Line Items]
Total marketing services and other revenues	6	9	7	15
U.S.
Segment Reporting Information [Line Items]
Total net revenues	1,055	1,005	2,129	1,995
United Kingdom
Segment Reporting Information [Line Items]
Total net revenues	369	329	725	640
Germany
Segment Reporting Information [Line Items]
Total net revenues	407	353	799	684
South Korea
Segment Reporting Information [Line Items]
Total net revenues	304	269	587	514
Rest of world
Segment Reporting Information [Line Items]
Total net revenues	$ 505	$ 463	$ 980	$ 889