Discontinued Operations - Summary of Financial Results (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes	$ 3,125	$ 270	$ 402
StubHub
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	100	1,121	1,083
Cost of net revenues	31	290	265
Gross profit	69	831	818
Sales and marketing	51	491	485
Product development	26	114	100
General and administrative	30	125	90
Provision for transaction losses	3	23	33
Amortization of acquired intangible assets	1	9	10
Total operating expenses	111	762	718
Income (loss) from operations of discontinued operations	(42)	69	100
Pre-tax gain on sale	3,868	0	0
Income (loss) from discontinued operations before income taxes	3,826	69	100
Income tax benefit (provision)	(896)	(10)	(22)
Income (loss) from discontinued operations, net of income taxes	2,930	59	78
Classifieds
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	980	1,043	1,013
Cost of net revenues	103	82	94
Gross profit	877	961	919
Sales and marketing	286	335	330
Product development	161	150	134
General and administrative	124	59	62
Provision for transaction losses	17	15	6
Amortization of acquired intangible assets	6	11	17
Total operating expenses	594	570	549
Income (loss) from operations of discontinued operations	283	391	370
Pre-tax gain on sale	0	(2)	(1)
Income (loss) from discontinued operations before income taxes	283	389	369
Income tax benefit (provision)	(86)	(172)	(47)
Income (loss) from discontinued operations, net of income taxes	197	217	322
Paypal and Enterprise
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes	$ (2)	$ (6)	$ 2