Settlement and Other Risk Management Estimated Settlement Exposure and Portion of Uncollateralized Settlement Exposure for MasterCard-Branded Transactions (Details) - Guarantee Obligations - USD ($) $ in Millions |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items] | ||
| Gross settlement exposure | $ 78,385 | $ 75,023 |
| Risk mitigation arrangements applied to settlement exposure | (13,466) | (12,167) |
| Net settlement exposure | $ 64,919 | $ 62,856 |