Discontinued Operations - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions, ₩ in Billions					3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 14, 2021 USD ($) $ / shares shares	Jun. 24, 2021 USD ($) shares	Jul. 20, 2020 USD ($) shares	Feb. 13, 2020 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 KRW (₩)	Jul. 12, 2021	Jun. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of net revenues						$ 678	$ 478	$ 1,956	$ 1,249
viagogo
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, extension term				12 months
viagogo | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, fees					$ 27
viagogo | Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, term				12 months
viagogo | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, term				18 months
Adevinta
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, extension term		6 months
Transaction service agreement, fees		$ 29
Adevinta | Minimum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, term		6 months
Adevinta | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction service agreement, term		12 months
Adevinta
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		44.00%				44.00%		44.00%
Percentage of voting shares acquired		33.00%
Percentage of non-voting shares acquired		11.00%
Value of equity method investment at acquisition date		$ 10,800
Discount rate on 10-day VWAP												7.00%
Discount rate on 30-day VWAP												5.00%
Revenue agreement, period						3 years
Extension period						12 months
Adevinta | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage after sale					33.00%
Adevinta | Permira
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of shares in equity investment | shares	125
Total consideration in sale of equity investment	$ 2,250
Purchase price per share (in usd per share) | $ / shares	$ 18.02
Sale of equity investment, option period	30 days
Number of additional shares in option to purchase | shares	10
Additional consideration in option to purchase	$ 180
StubHub
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income taxes of discontinued operations						$ 0	(2)	$ 3	891
StubHub | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of consideration received subject to adjustments				$ 4,050
Proceeds from sale of business				4,100
Proceeds received for business disposal, net of income taxes and transaction costs				3,200
Income taxes of discontinued operations				900
Gain on sale of business				$ 3,900
Classifieds | Intercompany
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues							2	5	9
Cost of net revenues							2	5	9
Classifieds | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount of consideration received subject to adjustments		13,300
Proceeds from sale of business		$ 2,500	$ 2,500
Income taxes of discontinued operations						9	31	2,178	43
Number of shares received from the sale | shares		540	540
Pre-tax gain from disposal of business		$ 12,500
Income tax expense on gain on disposal of business		$ 2,100
eBay Korea | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income taxes of discontinued operations						$ 1	$ 2	$ 3	$ 14
Percentage of equity interests to be sold													80.01%
eBay Korea | Discontinued Operations, Held-for-sale | Forecast
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business										$ 3,000	₩ 3,440
Ownership percentage after sale										19.99%	19.99%