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Earnings Per Share | 6 Months Ended
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Mar. 31, 2022
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per ShareThe Company presents both basic and diluted earnings per share ("EPS") amounts. Basic EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares outstanding during the reporting period. Diluted EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares and ordinary equivalent shares outstanding during the reporting period that are calculated using the treasury stock method for stock options, unvested restricted stock and unvested performance share awards. The treasury stock method assumes that the Company uses the proceeds from the exercise of stock option awards to repurchase ordinary shares at the average market price during the period. The assumed proceeds under the treasury stock method include the purchase price that the grantee will pay in the future and compensation cost for future service that the Company has not yet recognized. For unvested restricted stock and unvested performance share awards, assumed proceeds under the treasury stock method include unamortized compensation cost. 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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