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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 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):
| Three Months Ended March 31, |  | Six Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Income (loss) Available to Ordinary Shareholders |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 438 |  |  | $ | (148 | ) |  | $ | 668 |  |  | $ | 224 |
Loss from discontinued operations | — |  |  | — |  |  | — |  |  | (43 | )
Basic and diluted income (loss) available to shareholders | $ | 438 |  |  | $ | (148 | ) |  | $ | 668 |  |  | $ | 181 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 926.2 |  |  | 939.2 |  |  | 926.2 |  |  | 938.2 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 6.3 |  |  | — |  |  | 6.7 |  |  | 9.8 |
Diluted weighted average shares outstanding | 932.5 |  |  | 939.2 |  |  | 932.9 |  |  | 948.0 |
Antidilutive Securities |  |  |  |  |  |  |
Options to purchase shares | 1.4 |  |  | — |  |  | 1.2 |  |  | 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/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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