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Changes in the Escrow Account (Detail) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2016 USD ($) $ / shares shares | Sep. 30, 2015 USD ($) shares | Sep. 30, 2014 USD ($) | Jun. 21, 2016 USD ($)
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Preferred Stock Available to Recover Covered Losses, Value, As-converted |  | $ 6,504 |  |  |
Preferred Stock Available to Recover Covered Losses, Value |  | 5,717 |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Litigation Escrow Account Balance, Beginning of Period |  | 1,072 | $ 1,498 |  |
Litigation Escrow Account Balance, End of Period |  | 1,027 | 1,072 | $ 1,498 |
VE Covered Loss, Maximum Amount of Loss to Allow Adjustment of Conversion Rate during Six-month Period |  | 20 |  |  |
Right to recover for covered losses (Note 3) |  | (34) | 0 | $ 0 | $ 25
Initial conversion rate of UK&I and Europe preferred stock into class A common or class A equivalent preferred stock |  |  |  |  | 13.952
Preferred Stock Available to Recover Covered Losses, Value, As-converted, Net |  | 6,470 |  |  |
Preferred Stock Available to Recover Covered Losses, Value, Net |  | $ 5,683 |  |  |
Closing Stock Price | $ / shares |  | $ 82.7 |  |  |
Opt-out Merchants |  |  |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Payments to Settlement Funds | [1] | $ (45) | $ (426) |  |
MasterCard [Member] |  |  |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Omnibus Loss Sharing Agreement Percentage |  | 33.3333% |  |  |
Visa |  |  |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Omnibus Loss Sharing Agreement Percentage |  | 66.6667% |  |  |
Class A common stock |  |  |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Closing Stock Price | $ / shares |  | $ 82.70 |  |  |
Series B Preferred Stock |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Preferred Stock Available to Recover Covered Losses, Value, As-converted |  | $ 2,862 |  |  |
Preferred Stock Available to Recover Covered Losses, Value |  | $ 2,516 |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 2 | 0 |  |
Series C Preferred Stock |  |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |  |
Preferred Stock Available to Recover Covered Losses, Value, As-converted |  | $ 3,642 |  |  |
Preferred Stock Available to Recover Covered Losses, Value |  | $ 3,201 |  |  |
Escrow Account [Roll Forward] |  |  |  |  |
Preferred stock, shares outstanding | shares |  | 3 | 0 |  |
[1] | 1)These payments are associated with the interchange multidistrict litigation. See Note 20—Legal Matters.

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