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Legal and Regulatory Proceedings (Details) £ in Millions, € in Billions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 81 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) merchant | Sep. 30, 2025 GBP (£) | Sep. 30, 2025 USD ($) merchant | Sep. 30, 2025 USD ($) defendant merchant fax | Sep. 30, 2025 GBP (£) defendant fax | Sep. 30, 2025 EUR (€) defendant fax | Dec. 31, 2011 plaintiff | Sep. 30, 2025 USD ($) merchant | Sep. 30, 2025 GBP (£) merchant | Dec. 31, 2024 USD ($) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 complaint | Dec. 31, 2018
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 943,000,000 |  | $ 943,000,000 | $ 943,000,000 |  |  |  | $ 943,000,000 |  | $ 930,000,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Proposed U.K. Interchange Collective Action |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  |  | $ 13,000,000,000 | £ 10,000 |  |  |  |  |  |  |  |
Claims dismissed, number of years |  |  |  | 5 years | 5 years | 5 years |  |  |  |  |  |  |
Loss contingency accrual | 268,000,000 |  | 268,000,000 | $ 268,000,000 |  |  |  | 268,000,000 |  |  | £ 200 |  |
Portugal Proposed Interchange Collective Action |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  |  | $ 500,000,000 |  | € 0.4 |  |  |  |  |  |  |
Period of damages |  |  |  | 20 years | 20 years | 20 years |  |  |  |  |  |  |
Netherlands Interchange Collective Action |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  |  | $ 400,000,000 |  | € 0.3 |  |  |  |  |  |  |
ATM Operators Complaint |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims | complaint |  |  |  |  |  |  |  |  |  |  |  | 3 |
Amount of damages sought (that exceeds) |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  | 93,000,000 |  |  |
Number of plaintiffs in case | plaintiff |  |  |  |  |  |  | 13 |  |  |  |  |  |
U.S. Liability Shift Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Number of defendants | defendant |  |  |  | 4 | 4 | 4 |  |  |  |  |  |  |
Loss contingency accrual in period |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |
Non-bank ATM Consumer Class Complaint |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual | 79,000,000 |  | 79,000,000 | $ 79,000,000 |  |  |  | 79,000,000 |  |  |  |  |
Unresolved | U.K. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Unresolved damages claims | $ 300,000,000 |  | $ 300,000,000 | $ 300,000,000 |  |  |  | $ 300,000,000 | £ 200 |  |  |  |
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 claims | merchant | 55 |  | 55 | 55 |  |  |  | 55 | 55 |  |  |  |
Unresolved damages claims | $ 10,000,000,000 |  | $ 10,000,000,000 | $ 10,000,000,000 |  |  |  | $ 10,000,000,000 |  |  |  |  |
Percent of damages attributable to Mastercard | 0.36 |  | 0.36 | 0.36 |  |  |  | 0.36 | 0.36 |  |  |  |
Number of pending claims scheduled for trial | merchant | 6 |  | 6 | 6 |  |  |  | 6 | 6 |  |  |  |
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 | 90.00% |  | 90.00% | 90.00% |  |  |  | 90.00% | 90.00% |  |  |  |
U.S. Merchant Litigation - Opt-Out | Minimum | Settled Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims settled | merchant |  |  |  |  |  |  |  | 250 |  |  |  |  |
U.S. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 512,000,000 |  | $ 512,000,000 | $ 512,000,000 |  |  |  | $ 512,000,000 |  | $ 559,000,000 |  |  |

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