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Legal Matters - Additional Information (Detail) $ in Millions |  |  |  |  | 1 Months Ended | 2 Months Ended | 5 Months Ended | 12 Months Ended | 125 Months Ended | 127 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 29, 2020 state | Dec. 13, 2019 USD ($) | Sep. 17, 2018 USD ($) | Jun. 30, 2016 litigation_case | Oct. 31, 2011 atm_operator financial_institution | Jun. 16, 2021 state | Mar. 31, 2017 merchant | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2012 USD ($) | Nov. 15, 2023 merchant | Nov. 15, 2023 case_filed merchant | Jun. 01, 2022 claim | Sep. 30, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits into the U.S. litigation escrow account |  |  |  |  |  |  |  | $ 1,000 | $ 850 |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  | 1,751 | 1,456 |  |  |  |  | $ 983
Number of states | state | 24 |  |  |  |  | 25 |  |  |  |  |  |  |  |
Number of class action claims | claim |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
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 legal matters |  |  |  |  |  |  |  | 906 |  |  |  |  |  |
Deposits into the U.S. litigation escrow account |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Period of accrual |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Company's share of an additional settlement payment |  |  |  |  |  |  |  | 726 | 301 |  |  |  |  |
Loss contingency accrual |  |  |  |  |  |  |  | 1,621 | 1,441 |  |  |  |  | $ 881
Possible return to defendants |  | $ 467 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Covered Litigation | Settled 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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement percentage |  |  |  |  |  |  |  |  |  |  | 72.00% | 72.00% |  |
Interchange Multidistrict Litigation | U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for legal matters |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |
Interchange Multidistrict Litigation | U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for legal matters |  |  |  |  |  |  |  | $ 906 | $ 861 |  |  |  |  |
Interchange Multidistrict Litigation | U.S. Covered Litigation | Visa, MasterCard, and Certain U.S. Financial Institutions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for legal matters |  |  | $ 900 |  |  |  |  |  |  |  |  |  |  |
Interchange Opt Out Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of opt-out cases filed (more than) | case_filed |  |  |  |  |  |  |  |  |  |  |  | 50 |  |
Europe Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Europe Merchant Litigation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 1,150 |  |  |
Number of claims settled | merchant |  |  |  |  |  |  |  |  |  |  | 175 |  |  |
Number of claims pending | merchant |  |  |  |  |  |  |  |  |  |  | 900 | 900 |  |
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 | atm_operator |  |  |  |  | 13 |  |  |  |  |  |  |  |  |
Consumer Class Actions |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims pending | financial_institution |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of financial institutions | financial_institution |  |  |  |  | 3 |  |  |  |  |  |  |  |  |

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