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Stockholders' Equity (Tables) | 6 Months Ended
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Mar. 31, 2020
Stockholders' Equity Note [Abstract] |
Schedule of Stock by Class | As-converted class A common stock. The following table presents the number of shares of each series and class of stock and the number of shares of class A common stock on an as-converted basis:
| March 31, 2020 |  | September 30, 2019
| Shares Outstanding |  | Conversion Rate Into Class A Common Stock |  | As-converted Class A Common Stock(1) |  | Shares Outstanding |  | Conversion Rate Into Class A Common Stock |  | As-converted Class A Common Stock(1)
| (in millions, except conversion rates)
UK&I preferred stock | 2 |  |  | 12.9360 |  |  | 32 |  |  | 2 |  |  | 12.9360 |  |  | 32 |
Europe preferred stock | 3 |  |  | 13.8840 |  |  | 44 |  |  | 3 |  |  | 13.8840 |  |  | 44 |
Class A common stock(2) | 1,693 |  |  | — |  |  | 1,693 |  |  | 1,718 |  |  | — |  |  | 1,718 |
Class B common stock | 245 |  |  | 1.6228 |  | (3) | 398 |  |  | 245 |  |  | 1.6228 |  | (3) | 398 |
Class C common stock | 11 |  |  | 4.0000 |  |  | 43 |  |  | 11 |  |  | 4.0000 |  |  | 45 |
Total |  |  |  |  | 2,210 |  |  |  |  |  |  | 2,237 |
(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 that settled on or before March 31, 2020 and September 30, 2019.
(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.
Share Repurchase Program Disclosure | Common stock repurchases. The following table presents share repurchases in the open market for the following periods:
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in millions, except per share data)
Shares repurchased in the open market(1) | 18 |  |  | 14 |  |  | 31 |  |  | 31 |
Average repurchase price per share(2) | $ | 181.11 |  |  | $ | 144.94 |  |  | $ | 180.31 |  |  | $ | 141.08 |
Total cost(2) | $ | 3,133 |  |  | $ | 1,938 |  |  | $ | 5,503 |  |  | $ | 4,331 |
(1) | Shares repurchased in the open market reflect repurchases that settled during the three and six months ended March 31, 2020 and 2019. All shares repurchased in the open market have been retired and constitute authorized but unissued shares.
(2) Figures in the table may not recalculate exactly due to rounding. Average repurchase price per share and total cost is calculated based on unrounded numbers.

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