Segments (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			1
Number of reportable segments | segment			1
Segment Reporting Information [Line Items]
Total net transaction revenues	$ 1,879	$ 1,745	$ 5,425	$ 5,168
Total marketing services and other revenues	530	472	1,529	1,416
Total net revenues	2,409	2,217	6,954	6,584
Marketplace
Segment Reporting Information [Line Items]
Total net transaction revenues	1,606	1,484	4,721	4,505
Total marketing services and other revenues	293	273	859	824
StubHub
Segment Reporting Information [Line Items]
Total net transaction revenues	273	261	704	663
Classifieds
Segment Reporting Information [Line Items]
Total marketing services and other revenues	235	197	653	590
StubHub, Corporate and other
Segment Reporting Information [Line Items]
Total marketing services and other revenues	$ 2	$ 2	$ 17	$ 2