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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2020
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
Income Available to Ordinary Shareholders |  |  |  |  |  |  |
Income from continuing operations | $ | 213 |  |  | $ | 240 |  |  | $ | 372 |  |  | $ | 347 |
Income from discontinued operations | — |  |  | 275 |  |  | — |  |  | 523 |
Basic and diluted income available to shareholders | $ | 213 |  |  | $ | 515 |  |  | $ | 372 |  |  | $ | 870 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 754.8 |  |  | 902.5 |  |  | 762.4 |  |  | 912.1 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 2.3 |  |  | 3.4 |  |  | 3.2 |  |  | 3.5 |
Diluted weighted average shares outstanding | 757.1 |  |  | 905.9 |  |  | 765.6 |  |  | 915.6 |
Antidilutive Securities |  |  |  |  |  |  |
Options to purchase shares | 1.4 |  |  | 2.2 |  |  | 0.8 |  |  | 2.4 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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