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Earnings Per Share (Tables) | 6 Months Ended
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Mar. 31, 2024
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
Net income (loss) attributable to Johnson Controls | $ | (277) |  |  | $ | 133 |  |  | $ | 97 |  |  | $ | 251 |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 679.0 |  |  | 686.8 |  |  | 679.9 |  |  | 686.9 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | — |  |  | 2.9 |  |  | 1.6 |  |  | 3.1 |
Diluted weighted average shares outstanding | 679.0 |  |  | 689.7 |  |  | 681.5 |  |  | 690.0 |
Antidilutive Securities |  |  |  |  |  |  |
Stock options and unvested restricted stock | — |  |  | 0.3 |  |  | 0.5 |  |  | 0.3 |

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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/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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