Discontinued Operations - Summary of Financial Results (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Feb. 13, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of income taxes		$ (19)	$ 59	$ 10,494	$ 3,107
StubHub
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues		0	0	0	100
Cost of net revenues		0	0	0	31
Gross profit		0	0	0	69
Sales and marketing		0	0	0	51
Product development		0	(2)	0	27
General and administrative		0	0	0	33
Provision for transaction losses		0	0	0	3
Amortization of acquired intangible assets		0	0	0	1
Total operating expenses		0	(2)	0	115
Income (loss) from operations of discontinued operations		0	2	0	(46)
Pre-tax gain (loss) on sale		0	(8)	12	3,868
Income (loss) from discontinued operations before income taxes		0	(6)	12	3,822
Income tax benefit (provision)		0	2	(3)	(891)
Income (loss) from discontinued operations, net of income taxes		0	(4)	9	2,931
StubHub | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax benefit (provision)	$ (900)
Classifieds | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues		0	263	565	705
Cost of net revenues		0	27	63	76
Gross profit		0	236	502	629
Sales and marketing		0	72	183	220
Product development		0	44	105	118
General and administrative		9	36	76	98
Provision for transaction losses		0	3	2	13
Amortization of acquired intangible assets		0	2	0	6
Total operating expenses		9	157	366	455
Income (loss) from operations of discontinued operations		(9)	79	136	174
Interest and other, net		0	(1)	0	1
Pre-tax gain (loss) on sale		0	0	12,524	0
Income (loss) from discontinued operations before income taxes		(9)	78	12,660	175
Income tax benefit (provision)		(9)	(31)	(2,178)	(43)
Income (loss) from discontinued operations, net of income taxes		(18)	47	10,482	132
eBay Korea | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues		374	348	1,157	987
Cost of net revenues		217	178	663	482
Gross profit		157	170	494	505
Sales and marketing		136	132	418	390
Product development		14	16	43	43
General and administrative		8	5	29	13
Provision for transaction losses		0	0	0	0
Total operating expenses		158	153	490	446
Income (loss) from operations of discontinued operations		(1)	17	4	59
Interest and other, net		1	1	2	1
Income (loss) from discontinued operations before income taxes		0	18	6	60
Income tax benefit (provision)		(1)	(2)	(3)	(14)
Income (loss) from discontinued operations, net of income taxes		(1)	16	3	46
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		$ 0	$ 0	$ 0	$ (2)