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Earnings Per Share (Tables) | 3 Months Ended
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Dec. 31, 2023
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, |  |
| 2023 |  | 2022 |  |  |  |
Net income attributable to Johnson Controls | $ | 374 |  |  | $ | 118 |  |  |  |  |
Weighted Average Shares Outstanding |  |  |  |  |  |  |
Basic weighted average shares outstanding | 680.7 |  |  | 687.0 |  |  |  |  |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 1.7 |  |  | 3.3 |  |  |  |  |
Diluted weighted average shares outstanding | 682.4 |  |  | 690.3 |  |  |  |  |
Antidilutive Securities |  |  |  |  |  |  |
Stock options and unvested restricted stock | 0.6 |  |  | 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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