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Earnings Per Share (Tables) | 12 Months Ended
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Sep. 30, 2018
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):
| Year Ended September 30,
| 2018 |  | 2017 |  | 2016
Income (loss) Available to Ordinary Shareholders |  |  |  |  |
Income from continuing operations | $ | 2,162 |  |  | $ | 1,654 |  |  | $ | 732 |
Loss from discontinued operations | — |  |  | (43 | ) |  | (1,600 | )
Basic and diluted income (loss) available to shareholders | $ | 2,162 |  |  | $ | 1,611 |  |  | $ | (868 | )
Weighted Average Shares Outstanding |  |  |  |  |
Basic weighted average shares outstanding | 925.7 |  |  | 935.3 |  |  | 667.4 |
Effect of dilutive securities: |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 6.0 |  |  | 9.3 |  |  | 5.2 |
Diluted weighted average shares outstanding | 931.7 |  |  | 944.6 |  |  | 672.6 |
Antidilutive Securities |  |  |  |  |
Options to purchase shares | 1.5 |  |  | 0.2 |  |  | — |

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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/2003/role/presentationRef -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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