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Legal Matters - Additional Information (Details) $ in Millions |  | 6 Months Ended | 12 Months Ended | 82 Months Ended
--- | --- | --- | --- | ---
Dec. 27, 2019 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | May 04, 2020 merchant
Loss Contingencies [Line Items] |  |  |  |  |
Provision for legal matters |  | $ 7 | $ 159 |  |
Return of takedown payment to the litigation escrow account | $ 467 | 467 | 0 |  |
Interchange Multidistrict Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Provision for legal matters |  | $ 467 | $ 0 |  |
Subsequent Event | Interchange Multidistrict Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Settlement percentage |  |  |  |  | 30.00%
Subsequent Event | U.K. Merchant Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  | 500
Number of claims settled | merchant |  |  |  |  | 100
Merchants with outstanding claims | merchant |  |  |  |  | 400
Subsequent Event | U.K. Merchant Litigation | Threatened Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of plaintiffs | merchant |  |  |  |  | 30
Visa, MasterCard, and Certain U.S. Financial Institutions |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum takedown payments the defendants are entitled to |  |  |  | $ 700 |
U.S. Covered Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Maximum takedown payments the defendants are entitled to |  |  |  | 467 |
U.S. Covered Litigation | Interchange Multidistrict Litigation |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Provision for legal matters |  |  |  | $ 600 |
Return of takedown payment to the litigation escrow account | $ 467 |  |  |  |

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