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Legal Matters - Additional Information (Detail) $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended | 52 Months Ended | 136 Months Ended | 137 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 29, 2020 state | Dec. 13, 2019 USD ($) | Sep. 17, 2018 USD ($) | Jun. 30, 2016 litigation_case | Oct. 31, 2011 financial_institution non-bankATMOperator | Jun. 16, 2021 complaint state | Sep. 30, 2024 USD ($) plaintiff | Sep. 30, 2023 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2024 USD ($) complaint plaintiff | Nov. 13, 2024 merchant | Sep. 30, 2024 USD ($) case_filed plaintiff | Oct. 01, 2024 lawsuit | Jul. 31, 2024 class_action_case | Sep. 30, 2022 USD ($) | Jun. 01, 2022 class_action_case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  | $ 1,727 | $ 1,751 |  | $ 1,727 |  | $ 1,727 |  |  | $ 1,456 |
Number of complaints filed | complaint |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Number of states | state | 24 |  |  |  |  | 25 |  |  |  |  |  |  |  |  |  |
Number of separate complaints filed | complaint |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of plaintiff appealed | plaintiff |  |  |  |  |  |  | 3 |  |  | 3 |  | 3 |  |  |  |
Number of class action lawsuits | class_action_case |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 2
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Visa, MasterCard, and Certain U.S. Financial Institutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency accrual |  |  | $ 5,300 |  |  |  |  |  |  |  |  |  |  |  |  |
Possible return to defendants |  | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for unsettled legal matters |  |  |  |  |  |  | $ 140 | 906 |  |  |  |  |  |  |  |
Period of accrual |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of an additional settlement payment |  |  |  |  |  |  | 224 | 726 |  |  |  |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  | $ 1,537 | $ 1,621 |  | $ 1,537 |  | $ 1,537 |  |  | $ 1,441 |
Possible return to defendants |  | $ 467 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settled Litigation | U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of an additional settlement payment |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |
Class Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |
Settlement, further distribution of default interchange |  |  |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |
Loss contingency, further distributions, default period |  |  |  |  |  |  |  |  | 8 months |  |  |  |  |  |  |
Loss contingency, number of cases appointed counsel | litigation_case |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Interchange Multidistrict Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement percentage |  |  |  |  |  |  | 73.00% |  |  | 73.00% |  | 73.00% |  |  |  |
Interchange Multidistrict Litigation | U.S. Covered Litigation | Visa, MasterCard, and Certain U.S. Financial Institutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for unsettled legal matters |  |  | $ 900 |  |  |  |  |  |  |  |  |  |  |  |  |
Interchange Multidistrict Litigation | U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for unsettled legal matters |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |
Interchange Opt Out Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases | case_filed |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |
Europe Merchant Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 1,150 |  |  |  |  |
Number of claims settled | merchant |  |  |  |  |  |  |  |  |  |  | 475 |  |  |  |  |
Number of claims pending | merchant |  |  |  |  |  |  |  |  |  |  | 600 |  |  |  |  |
Europe Merchant Litigation | Threatened Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |  |
National ATM Council Class Action |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of non-bank ATM operators | non-bankATMOperator |  |  |  |  | 13 |  |  |  |  |  |  |  |  |  |  |
Consumer Class Actions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims pending | financial_institution |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
U.S. Debit Class Actions | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of class action lawsuits | lawsuit |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Mackim v. Visa Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of financial institutions | financial_institution |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |

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