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U.S. and Europe Retrospective Responsibility Plans - Additional Information (Details) € in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2025 USD ($) shares | Jul. 31, 2024 USD ($) shares | Sep. 30, 2025 EUR (€) | Jun. 21, 2016 EUR (€)
Class of Stock [Line Items] |  |  |  |
Omnibus loss sharing agreement percentage |  |  | 66.6667% |
Litigation loss sharing agreement, obligation threshold | € |  |  |  | € 1,000
Limit of protection from VE territory covered losses (in percent) |  |  |  | 70.00%
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | € |  |  | € 20 |
Conversion adjustment denominator (in shares) | shares | 100 | 100 |  |
Series B Preferred Stock And Series C Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock issued | $ | $ 1,400 | $ 2,700 |  |
Series A Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares issued (in shares) | shares | 40,080 | 99,264 |  |
Cash paid for fractional shares of series A preferred stock | $ | $ 7 | $ 5 |  |
MasterCard |  |  |  |
Class of Stock [Line Items] |  |  |  |
Omnibus loss sharing agreement percentage |  |  | 33.3333% |

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