Legal and Regulatory [Line Items] [Line Items]

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Loss Contingency, Damages Sought, Complaint Period

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Loss Contingency, Damages Sought, Per Claim

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- Definition

Loss Contingency, Pending Claims, Excluded Merchants, Number

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- Definition

Loss Contingency, Unsolicited Advertisements

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Percent Of Settlement Reporting Entity Would Pay

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- Definition

Percentage Of Opt-Out Merchants To Terminate

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- Definition

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Number of defendants named in a legal action.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of pending claims pertaining to a loss contingency.

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Legal and Regulatory Proceedings (Details) £ in Millions, € in Billions	9 Months Ended			12 Months Ended
	Sep. 30, 2026 USD ($) defendant plaintiff fax	Sep. 30, 2026 GBP (£) defendant plaintiff fax	Sep. 30, 2026 EUR (€) defendant plaintiff fax	Dec. 31, 2011 plaintiff	Oct. 31, 2026 complaint	Sep. 30, 2026 GBP (£)	Feb. 28, 2026 merchant	Dec. 31, 2025 USD ($)	Dec. 31, 2023 complaint	Dec. 31, 2018
Legal And Regulatory
Accrued litigation	$ 262,000,000							$ 800,000,000
Unsolicited faxes \| fax	381,000	381,000	381,000
Damages sought per fax (in usd per fax)	$ 500
2022 Mastercard and Visa Proposed Collective Action Complaint in the U.K.
Legal And Regulatory
Amount of damages sought (that exceeds)	1,300,000,000	£ 1,000
Loss Contingency, Pending Claims, Excluded Merchants, Number \| merchant							100
Portugal Proposed Interchange Collective Action
Legal And Regulatory
Amount of damages sought (that exceeds)	$ 500,000,000		€ 0.4
Loss Contingency, Damages Sought, Complaint Period	20 years	20 years	20 years
Netherlands Interchange Collective Action
Legal And Regulatory
Amount of damages sought (that exceeds)	$ 300,000,000		€ 0.3
ATM Operators Complaint
Legal And Regulatory
Number of plaintiffs in case \| plaintiff				13
Number of claims \| complaint									3
U.S. Liability Shift Litigation
Legal And Regulatory
Amount of damages sought (that exceeds)	1,000,000,000
Loss contingency accrual	$ 80,000,000
Number of defendants \| defendant	4	4	4
Non-bank ATM Consumer Class Complaint
Legal And Regulatory
Loss contingency accrual	$ 79,000,000
2026 Visa and Mastercard Proposed Collective Action Interchange
Legal And Regulatory
Amount of damages sought (that exceeds)	$ 500,000,000	£ 400
U.S. Merchant Litigation - Class Litigation - Block and Intuit
Legal And Regulatory
Number of plaintiffs in case \| plaintiff	2	2	2
2026 Visa and Mastercard Proposed Collective Action in the U.K. (Consumer Domestic and Cross-Border)
Legal And Regulatory
Amount of damages sought (that exceeds)	$ 2,000,000,000.0	£ 1,500
2026 Visa and Mastercard Proposed Collective Action Complaints in the U.K. \| Subsequent Event
Legal And Regulatory
Number of claims \| complaint					2
Unresolved \| U.K. Merchant Lawsuit Settlement
Legal And Regulatory
Unresolved damages claims	700,000,000					£ 500
Event Involving Visa Parties, Member Banks and Mastercard
Legal And Regulatory
Percent of settlement Mastercard would pay				12.00%
Event Involving Member Banks and Mastercard
Legal And Regulatory
Percent of settlement Mastercard would pay				36.00%
U.S. Merchant Litigation - Class Litigation \| Maximum
Legal And Regulatory
Percentage of merchant opt outs to terminate agreement										25.00%
U.S. Merchant Lawsuit Settlement
Legal And Regulatory
Accrued litigation	156,000,000							$ 637,000,000
U.S. Merchant Litigation - Class Litigation - Block and Intuit
Legal And Regulatory
Amount of damages sought (that exceeds)	$ 5,000,000,000