Investments - Schedule of Available-For-Sale Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Investments
Estimated Fair Value	$ 2,541
Balance Sheet Location [Axis]: ebay:LongTermInvestmentsExcludingEquitySecuritiesFVNI
Investments
Gross Amortized Cost	1,546	$ 1,822
Gross Unrealized Gains	4	16
Gross Unrealized Losses	(6)	0
Estimated Fair Value	1,544	1,838
Balance Sheet Location [Axis]: ebay:LongTermInvestmentsExcludingEquitySecuritiesFVNI \| Corporate bonds
Investments
Gross Amortized Cost	1,522	1,797
Gross Unrealized Gains	4	16
Gross Unrealized Losses	(6)	0
Estimated Fair Value	1,520	1,813
Balance Sheet Location [Axis]: ebay:LongTermInvestmentsExcludingEquitySecuritiesFVNI \| Government and agency securities
Investments
Gross Amortized Cost	24	25
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	24	25
Balance Sheet Location [Axis]: ebay:ShortTermInvestmentsExcludingEquitySecuritiesAccountedForUnderFairValueOption
Investments
Gross Amortized Cost	996	1,051
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	(1)
Estimated Fair Value	997	1,052
Balance Sheet Location [Axis]: ebay:ShortTermInvestmentsExcludingEquitySecuritiesAccountedForUnderFairValueOption \| Corporate bonds
Investments
Gross Amortized Cost	763	743
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	0
Estimated Fair Value	764	745
Balance Sheet Location [Axis]: ebay:ShortTermInvestmentsExcludingEquitySecuritiesAccountedForUnderFairValueOption \| Commercial paper
Investments
Gross Amortized Cost	149	243
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	149	243
Balance Sheet Location [Axis]: ebay:ShortTermInvestmentsExcludingEquitySecuritiesAccountedForUnderFairValueOption \| Government and agency securities
Investments
Gross Amortized Cost	84	65
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Estimated Fair Value	$ 84	$ 64

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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