Debt - Carrying Value of Outstanding Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	May 31, 2021	Dec. 31, 2020
Long-Term Debt
Total senior notes	$ 9,105		$ 7,750
Hedge accounting fair value adjustments	9		10
Unamortized premium/(discount) and debt issuance costs	(32)		(20)
Current portion of long-term debt	(1,355)		0
Total long-term debt	7,727		7,740
Short-Term Debt
Current portion of long-term debt	1,355		0
Unamortized premium/(discount) and debt issuance costs	0		0
Other short-term borrowings	0		6
Total short-term debt	1,355		6
Total Debt	$ 9,082		7,746
Senior Notes \| Floating rate, Senior notes due 2023
Long-Term Debt
Coupon rate	87.00%
Total senior notes	$ 400		$ 400
Effective interest rate	1.10%		1.187%
Senior Notes \| 3.800% Senior notes due 2022
Long-Term Debt
Coupon rate	3.80%
Total senior notes	$ 750		$ 750
Effective interest rate	3.989%		3.989%
Senior Notes \| 2.600% Senior notes due 2022
Long-Term Debt
Coupon rate	2.60%
Total senior notes	$ 605		$ 1,000
Effective interest rate	2.678%		2.678%
Senior Notes \| 2.750% Senior notes due 2023
Long-Term Debt
Coupon rate	2.75%
Total senior notes	$ 750		$ 750
Effective interest rate	2.866%		2.866%
Senior Notes \| 3.450% Senior notes due 2024
Long-Term Debt
Coupon rate	3.45%
Total senior notes	$ 750		$ 750
Effective interest rate	3.531%		3.531%
Senior Notes \| 1.900% Senior notes due 2025
Long-Term Debt
Coupon rate	1.90%
Total senior notes	$ 800		$ 800
Effective interest rate	1.803%		1.803%
Senior Notes \| 1.400% Senior notes due 2026
Long-Term Debt
Coupon rate	1.40%	1.40%
Total senior notes	$ 750		$ 0
Effective interest rate	1.252%		0.00%
Senior Notes \| 3.600% Senior notes due 2027
Long-Term Debt
Coupon rate	3.60%
Total senior notes	$ 850		$ 850
Effective interest rate	3.689%		3.689%
Senior Notes \| 2.700% Senior notes due 2030
Long-Term Debt
Coupon rate	2.70%
Total senior notes	$ 950		$ 950
Effective interest rate	2.623%		2.623%
Senior Notes \| 2.600% Senior notes due 2031
Long-Term Debt
Coupon rate	2.60%	2.60%
Total senior notes	$ 750		$ 0
Effective interest rate	2.186%		0.00%
Senior Notes \| 4.000% Senior notes due 2042
Long-Term Debt
Coupon rate	4.00%
Total senior notes	$ 750		$ 750
Effective interest rate	4.114%		4.114%
Senior Notes \| 3.650% Senior notes due 2051
Long-Term Debt
Coupon rate	3.65%	3.65%
Total senior notes	$ 1,000		$ 0
Effective interest rate	2.517%		0.00%
Senior Notes \| 6.000% Senior notes due 2056
Long-Term Debt
Coupon rate	6.00%
Total senior notes	$ 0		$ 750
Effective interest rate	0.00%		6.547%

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Current

No definition available.

Name:	ebay_DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNetCurrent
Namespace Prefix:	ebay_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Noncurrent

+ References

No definition available.

+ Details

Name:	ebay_DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNetNoncurrent
Namespace Prefix:	ebay_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of addition (reduction) to long-term debt, hedge accounting, fair value

+ References

No definition available.

+ Details

Name:	ebay_LongtermDebtHedgeAccountingFairValueAdjustment
Namespace Prefix:	ebay_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of short-term and long-term debt and lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as noncurrent.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a)(7))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_ShortTermBorrowingsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_SeniorNotesFloatingRateDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_ThreePointEightHundredPercentSeniorNotesDueOn2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_TwoPointSixPercentSeniorNotesDueOn2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_TwoPointSevenHundredFiftyPercentSeniorNotesDueOn2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_ThreePointFourHundredFiftyPercentSeniorNotesDueOn2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_OnePointNineZeroPercentSeniorNotesDueOn2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_A1400FixedRateNotesDue2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_ThreePointSixHundredPercentSeniorNotesDueOn2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_TwoPointSevenZeroPercentSeniorNotesDueOn2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_A2600FixedRateNotesDue2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_FourPointZeroPercentSeniorNotesDueOn2042Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_A3650FixedRateNotesDue2051Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ebay_SixPointZeroPercentSeniorNotesDueOn2056Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: