Segments (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment				3					3	1
Net Revenues
Total consolidated net revenue	$ 2,821	$ 2,649	$ 2,687	$ 2,643	$ 2,877	$ 2,649	$ 2,640	$ 2,580	$ 10,800	$ 10,746	$ 9,927
Operating income (loss)
Total operating income									2,321	2,222	2,264
Interest and other, net									(114)	496	11
Income from continuing operations before income taxes									2,207	2,718	2,275
Long-lived tangible assets by geography:
Total long-lived tangible assets	2,138				1,812				2,138	1,812
U.S.
Net Revenues
Total consolidated net revenue									4,337	4,373	4,187
Long-lived tangible assets by geography:
Total long-lived tangible assets	1,786				1,661				1,786	1,661
Germany
Net Revenues
Total consolidated net revenue									1,506	1,591	1,464
United Kingdom
Net Revenues
Total consolidated net revenue									1,441	1,481	1,368
South Korea
Net Revenues
Total consolidated net revenue									1,221	1,195	1,061
Rest of world
Net Revenues
Total consolidated net revenue									2,295	2,106	1,847
International
Long-lived tangible assets by geography:
Total long-lived tangible assets	$ 352				$ 151				352	151
Operating segments
Net Revenues
Total consolidated net revenue									10,800	10,746	9,927
Elimination of inter-segment net revenue
Net Revenues
Total consolidated net revenue									(20)	0	0
Corporate and other costs
Operating income (loss)
Total operating income									(1,052)	(1,001)	(837)
Classifieds | Operating segments
Net Revenues
Total consolidated net revenue									1,061	1,022	897
Operating income (loss)
Total operating income									420	401	314
StubHub | Operating segments
Net Revenues
Total consolidated net revenue									1,121	1,083	1,029
Operating income (loss)
Total operating income									139	149	161
StubHub | Operating segments | Net transaction revenues
Net Revenues
Total consolidated net revenue									1,057	1,068	1,011
StubHub | Operating segments | Marketing services and other revenues
Net Revenues
Total consolidated net revenue									64	15	18
Marketplace | Operating segments
Net Revenues
Total consolidated net revenue									8,638	8,641	8,001
Operating income (loss)
Total operating income									2,814	2,673	2,626
Marketplace | Operating segments | Net transaction revenues
Net Revenues
Total consolidated net revenue									7,578	7,416	6,809
Marketplace | Operating segments | Marketing services and other revenues
Net Revenues
Total consolidated net revenue									$ 1,060	$ 1,225	$ 1,192