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U.S. and Europe Retrospective Responsibility Plan U.S. and Europe Retrospective Responsibility Plan Additional Details (Details) € in Millions, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 USD ($) | Jun. 21, 2016 EUR (€) | Jun. 21, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Loss Contingency, Litigation Loss Sharing Agreement, Obligation Threshold | € |  |  |  |  |  | € 1,000 |
Limit Of Protection From VE Territory Covered Losses |  |  |  |  |  | 70.00% | 70.00%
VE covered loss, maximum amount of loss to allow adjustment of conversion rate during six-month period | € |  |  |  | € 20 |  |  |
Right to recover for covered losses | $ 52 |  | $ 34 |  | $ 52 |  | $ 25
Series B Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  | 190 |  |
Preferred stock, conversion rate | 13.0770 | [1] | 13.952 |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  | 1 |  |
Preferred stock, conversion rate | 13.9480 |  | 13.952 |  |  |  |
Right to Recover for Covered Losses |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Recovery through conversion rate adjustment |  |  |  |  | $ 191 |  |
MasterCard |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Omnibus loss sharing agreement percentage | 33.3333% |  |  |  | 33.3333% |  |
Visa |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Omnibus loss sharing agreement percentage | 66.6667% |  |  |  | 66.6667% |  |
[1] | The class B to class A common stock conversion rate is presented on a rounded basis. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.

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