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Earnings Per Share (Tables) | 3 Months Ended
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Dec. 31, 2019
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 December 31,
| 2019 |  | 2018
Income Available to Ordinary Shareholders |  |  |
Income from continuing operations | $ | 159 |  |  | $ | 107 |
Income from discontinued operations | — |  |  | 248 |
Basic and diluted income available to shareholders | $ | 159 |  |  | $ | 355 |
Weighted Average Shares Outstanding |  |  |
Basic weighted average shares outstanding | 769.9 |  |  | 921.6 |
Effect of dilutive securities: |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 4.1 |  |  | 3.6 |
Diluted weighted average shares outstanding | 774.0 |  |  | 925.2 |
Antidilutive Securities |  |  |
Options to purchase shares | 0.2 |  |  | 2.7 |

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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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