Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Net Revenues
Total consolidated net revenue	$ 2,865	$ 2,423	$ 5,239	$ 4,836
Operating income (loss)
Total operating income	821	558	1,450	1,151
Interest and other, net	182	(51)	184	13
Income from continuing operations before income taxes	1,003	507	1,634	1,164
U.S.
Net Revenues
Total consolidated net revenue	1,086	820	1,908	1,662
Germany
Net Revenues
Total consolidated net revenue	397	392	754	776
United Kingdom
Net Revenues
Total consolidated net revenue	453	363	801	716
South Korea
Net Revenues
Total consolidated net revenue	334	300	646	597
Rest of world
Net Revenues
Total consolidated net revenue	595	548	1,130	1,085
Operating Segments
Net Revenues
Total consolidated net revenue	2,865	2,423	5,239	4,836
Operating Segments | Marketplace
Net Revenues
Total consolidated net revenue	2,668	2,157	4,798	4,319
Operating income (loss)
Total operating income	1,067	689	1,828	1,458
Operating Segments | Classifieds
Net Revenues
Total consolidated net revenue	201	271	449	527
Operating income (loss)
Total operating income	61	102	144	193
Elimination of inter-segment net revenue
Net Revenues
Total consolidated net revenue	(4)	(5)	(8)	(10)
Corporate and other costs
Operating income (loss)
Total operating income	(307)	(233)	(522)	(500)
Net transaction revenues | Operating Segments | Marketplace
Net Revenues
Total consolidated net revenue	2,447	1,887	4,347	3,772
Marketing services and other revenues | Operating Segments | Marketplace
Net Revenues
Total consolidated net revenue	$ 221	$ 270	$ 451	$ 547