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Legal and Regulatory Proceedings (Details) £ in Millions, € in Billions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2026 USD ($) merchant | Mar. 31, 2026 GBP (£) | Mar. 31, 2026 USD ($) merchant defendant fax | Mar. 31, 2026 EUR (€) defendant fax | Dec. 31, 2011 plaintiff | Mar. 31, 2026 GBP (£) merchant | Feb. 28, 2026 merchant | Dec. 31, 2025 USD ($) | Dec. 31, 2023 complaint | Dec. 31, 2018
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 339,000,000 |  | $ 339,000,000 |  |  |  |  | $ 800,000,000 |  |
Unsolicited faxes | fax |  |  | 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 |  |  |  |  |  |
Netherlands Interchange Collective Action |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  | $ 300,000,000 | € 0.3 |  |  |  |  |  |
ATM Operators Complaint |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  | 1,000,000,000 |  |  |  |  |  |  |
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 |  | $ 80,000,000 |  |  |  |  |  |  |
Number of defendants | defendant |  |  | 4 | 4 |  |  |  |  |  |
Non-bank ATM Consumer Class Complaint |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Loss contingency accrual | 79,000,000 |  | $ 79,000,000 |  |  |  |  |  |  |
Unresolved | U.K. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Unresolved damages claims | $ 400,000,000 |  | $ 400,000,000 |  |  | £ 300 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Number of pending claims scheduled for trial | merchant | 6 |  | 6 |  |  | 6 |  |  |  |
Amount of damages sought (that exceeds) |  |  | $ 500,000,000 |  |  |  |  |  |  |
Loss Contingency, Pending Claims, Groups Of Opt-Out Merchants, Number | merchant | 2 |  | 2 |  |  | 2 |  |  |  |
U.S. Merchant Litigation - Class Litigation | Maximum |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Percentage of merchant opt outs to terminate agreement |  |  |  |  |  |  |  |  |  | 25.00%
U.S. Merchant Litigation - Class Litigation | Minimum |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Mastercard's U.S. interchange volume represented by opt-out merchant and damages class settlement, percentage | 95.00% |  | 95.00% |  |  | 95.00% |  |  |  |
U.S. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 177,000,000 |  | $ 177,000,000 |  |  |  |  | $ 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 |  |  |  |  |  |  |

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