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Legal Matters - Additional Information (Detail) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 27, 2014 USD ($) | Dec. 10, 2012 USD ($) | Oct. 29, 2012 USD ($) | Nov. 30, 2016 litigation_case | Oct. 31, 2011 financial_institution | Dec. 31, 2010 financial_institution entity | Sep. 30, 2014 USD ($) | Aug. 10, 2013 | Sep. 30, 2017 USD ($) litigation_case case_filed merchant | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) case_filed merchant | Oct. 11, 2011 atm_operator | Dec. 01, 2010 litigation_case
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in deferred tax assets reflecting the current tax deduction related to payments made in connection with the covered litigation |  |  |  |  |  |  |  |  | $ 978 |  |  |  |
Class Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement, Further Distribution of Default Interchange, Rate |  |  |  |  |  |  |  | 0.10 |  |  |  |  |
Payments for legal settlements | $ 4,000 | $ 4,000 |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Cases Appointed Counsel | litigation_case |  |  |  | 2 |  |  |  |  |  |  |  |  |
Loss contingency, further distributions, default period |  |  |  |  |  |  |  | 8 months |  |  |  |  |
Individual Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  | $ 350 |  |  |  |  |  |  |  |  |  |
Interchange Opt Out Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of opt-out cases filed | case_filed |  |  |  |  |  |  |  |  | 50 |  | 50 |  |
Settlements reached by percentage of sales volume of merchants who opted out |  |  |  |  |  |  |  |  | 51.00% |  | 51.00% |  |
U.K. Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 300 |  |
Damages sought, value |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Canadian Competition Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Financial Institutions | financial_institution |  |  |  |  |  | 10 |  |  |  |  |  |  |
Canadian Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims pending | litigation_case |  |  |  |  |  |  |  |  |  |  |  |  | 3
Number of claims dismissed | entity |  |  |  |  |  | 3 |  |  |  |  |  |  |
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 Financial Institutions | financial_institution |  |  |  |  | 3 |  |  |  |  |  |  |  |
Number of claims pending | financial_institution |  |  |  |  | 2 |  |  |  |  |  |  |  |
Unsettled |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for legal matters |  |  |  |  |  |  |  |  | $ 19 | $ 2 |  |  |
Settled Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on unsettled and settled matters |  |  |  |  |  |  |  |  | $ (204) | (47) |  |  |
Settled Litigation | U.K. Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 75 |  |
Settled Litigation | Canadian Competition Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Financial Institutions | entity |  |  |  |  |  | 5 |  |  |  |  |  |  |
U.S. Covered Litigation | Interchange Multidistrict Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for legal matters | $ 1,100 |  |  |  |  |  |  |  |  |  |  |  |
Pending Litigation | U.K. Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  |  |  | 200 |  |
Pending Litigation | Canadian Competition Proceedings |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Financial Institutions | entity |  |  |  |  |  | 1 |  |  |  |  |  |  |
Threatened Litigation | Europe Interchange Rate Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  |  |  |  |  | 30 |  |  |  |
Visa, MasterCard, and Certain U.S. Financial Institutions | Interchange Opt Out Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims filed | litigation_case |  |  |  |  |  |  |  |  | 4 |  |  |  |
Visa | Interchange Opt Out Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims filed | litigation_case |  |  |  |  |  |  |  |  | 3 |  |  |  |
Visa | Canadian Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims pending | litigation_case |  |  |  |  |  |  |  |  |  |  |  |  | 1
MasterCard | Canadian Merchant Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims pending | litigation_case |  |  |  |  |  |  |  |  |  |  |  |  | 2
U.S. Covered Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Deposits into litigation escrow account |  |  |  |  |  |  | $ 450 |  |  |  |  |  |
U.S. Covered Litigation | Settled Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on unsettled and settled matters |  |  |  |  |  |  |  |  | $ 0 | $ (45) | $ (528) |  |

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