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Legal and Regulatory Proceedings (Details) £ in Millions, € in Billions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended | 69 Months Ended |  |  |  |  |  |
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Sep. 30, 2024 USD ($) complaint merchant | Dec. 31, 2023 GBP (£) | Sep. 30, 2024 USD ($) defendant fax complaint merchant | Sep. 30, 2024 GBP (£) defendant fax | Sep. 30, 2024 EUR (€) defendant fax | Dec. 31, 2011 plaintiff | Sep. 30, 2024 USD ($) merchant complaint | Oct. 31, 2024 USD ($) merchant | Sep. 30, 2024 GBP (£) complaint merchant | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2019 complaint | Dec. 31, 2018
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 665,000,000 |  | $ 665,000,000 |  |  |  | $ 665,000,000 |  |  |  | $ 723,000,000 |  |
Unsolicited faxes | fax |  |  | 381,000 | 381,000 | 381,000 |  |  |  |  |  |  |  |
Damages sought per fax (in usd per fax) |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | merchant | 65 |  | 65 |  |  |  | 65 |  | 65 |  |  |  |
U.S. Merchant Litigation - Class Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Unresolved damages claims |  |  |  |  |  |  |  | $ 12,000,000,000 |  |  |  |  |
Percent of damages attributable to Mastercard |  |  |  |  |  |  |  | 0.36 |  |  |  |  |
Number of pending claims scheduled for trial | merchant |  |  |  |  |  |  |  | 6 |  |  |  |  |
U.S. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued litigation | $ 572,000,000 |  | $ 572,000,000 |  |  |  | $ 572,000,000 |  |  |  | $ 596,000,000 |  |
Maximum | U.S. Merchant Litigation - Class Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of merchant opt outs to terminate agreement |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Minimum | U.S. Merchant Litigation - Class Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
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 |  |  |  |  |  |  |  |
ATM Operators Complaint |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pending claims | complaint | 2 |  | 2 |  |  |  | 2 |  | 2 |  |  | 3 |
Amount of damages sought (that exceeds) | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs in case | plaintiff |  |  |  |  |  | 13 |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  |  |  | $ 93,000,000 |  |  |
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 |  |  |  |  |  |  |  |
Portugal Proposed Interchange Collective Action |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of damages sought (that exceeds) |  |  | $ 400,000,000 |  | € 0.4 |  |  |  |  |  |  |  |
Period of damages |  |  | 20 years | 20 years | 20 years |  |  |  |  |  |  |  |
Unresolved | U.K. Merchant Lawsuit Settlement |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Unresolved damages claims | $ 400,000,000 |  | $ 400,000,000 |  |  |  | $ 400,000,000 |  | £ 300 |  |  |  |
Settled Litigation | Minimum | U.S. Merchant Litigation - Opt-Out |  |  |  |  |  |  |  |  |  |  |  |  |
Legal And Regulatory |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims settled | merchant |  |  |  |  |  |  | 250 |  |  |  |  |  |

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