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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2022
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 March 31, |  | Six Months Ended March 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
Income Available to Ordinary Shareholders |  |  |  |  |  |  |
Income from continuing operations | $ | 11 |  |  | $ | 343 |  |  | $ | 392 |  |  | $ | 670 |
Income from discontinued operations | — |  |  | — |  |  | — |  |  | 124 |
Basic and diluted income available to shareholders | $ | 11 |  |  | $ | 343 |  |  | $ | 392 |  |  | $ | 794 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 699.1 |  |  | 717.1 |  |  | 701.8 |  |  | 720.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 3.6 |  |  | 4.2 |  |  | 4.4 |  |  | 3.8 |
Diluted weighted average shares outstanding | 702.7 |  |  | 721.3 |  |  | 706.2 |  |  | 723.9 |
Antidilutive Securities |  |  |  |  |  |  |
Stock options and unvested restricted stock | 0.3 |  |  | — |  |  | 0.2 |  |  | 0.1 |

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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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