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Stockholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2017
Stockholders' Equity Note [Abstract] |
Schedule of Common Stock as Converted | The number of shares of each series and class, and the number of shares of class A common stock on an as-converted basis at September 30, 2017, are as follows:
(in millions, except conversion rate) | Shares Outstanding |  | Conversion Rate Into Class A Common Stock |  | As-converted Class A Common Stock (1)
UK&I preferred stock | 2 |  |  | 13.0770 |  |  | 32 |
Europe preferred stock | 3 |  |  | 13.9480 |  |  | 44 |
Class A common stock (2) | 1,818 |  |  | — |  |  | 1,818 |
Class B common stock | 245 |  |  | 1.6483 |  | (3) | 405 |
Class C common stock | 13 |  |  | 4.0000 |  |  | 51 |
Total |  |  |  |  | 2,350 |
(1) | Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
(2) | Class A common stock shares outstanding reflect repurchases settled on or before September 30, 2017.
(3) | 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.
Schedule of Share Repurchases in the Open Market | The following table presents share repurchases in the open market during the following fiscal years(1):
(in millions, except per share data) | 2017 |  | 2016
Shares repurchased in the open market(2) | 77 |  |  | 91 |
Average repurchase price per share(3) | $ | 89.98 |  |  | $ | 77.05 |
Total cost | $ | 6,891 |  |  | $ | 6,987 |
(1) | Shares repurchased in the open market reflect repurchases settled during fiscal 2017. These amounts include repurchases traded but not yet settled on or before September 30, 2016 for fiscal 2017 or September 30, 2015 for fiscal 2016 and exclude repurchases traded but not yet settled on or before September 30, 2017 for fiscal 2017 or September 30, 2016 for fiscal 2016.
(2) | All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
(3) | Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.
Effect of VE Territory Covered Losses Recovery on the Company Repurchasing its Common Stock [Table Text Block] | The following table presents as-converted UK&I and Europe preferred stock, after the Company recovered VE territory covered losses through conversion rate adjustments, for fiscal 2017. There was no comparable adjustment recorded for Europe preferred stock during fiscal 2016.
| UK&I Preferred Stock |  | Europe Preferred Stock
(in millions, except per share and conversion rate data) | 2017 |  | 2017
Reduction in equivalent number of shares of class A common stock | 2 |  |  | — |  | (1)
Effective price per share (2) | $ | 88.70 |  |  | $ | 85.01 |  |
Recovery through conversion rate adjustment | $ | 190 |  |  | $ | 1 |  |
(1) | The reduction in equivalent number of shares of class A common stock was less than one million shares.
(2) | Effective price per share is calculated using the volume-weighted average price of the Company's class A common stock over a pricing period in accordance with the Company's current certificates of designations for its series B and C convertible participating preferred stock.

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