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Earnings Per Share (Tables) | 9 Months Ended
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Jun. 30, 2021
Earnings Per Share [Abstract] |
Earnings Per Share | The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions):
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Income (Loss) Available to Ordinary Shareholders |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 574 |  |  | $ | (182) |  |  | $ | 1,244 |  |  | $ | 190 |
Income from discontinued operations | — |  |  | — |  |  | 124 |  |  | — |
Basic and diluted income (loss) available to shareholders | $ | 574 |  |  | $ | (182) |  |  | $ | 1,368 |  |  | $ | 190 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 714.5 |  |  | 744.0 |  |  | 718.2 |  |  | 756.3 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 5.2 |  |  | — |  |  | 4.3 |  |  | 2.6 |
Diluted weighted average shares outstanding | 719.7 |  |  | 744.0 |  |  | 722.5 |  |  | 758.9 |
Antidilutive Securities |  |  |  |  |  |  |
Options to purchase shares | — |  |  | — |  |  | 0.1 |  |  | 1.6 |
For the three months ended June 30, 2020, the total number of potential dilutive shares due to stock options, unvested restricted stock and unvested performance share awards was 1.5 million. However, these items were not included in the computation of diluted loss per share for the three months ended June 30, 2020 since to do so would decrease the loss per share.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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