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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2025
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income, net of tax | The following table includes changes attributable to both continuing and discontinued operations in AOCI attributable to Johnson Controls (in millions, net of tax):
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
Foreign currency translation adjustments |  |  |  |  |
Balance at beginning of period | $ | (956) |  |  | $ | (970) |  |  | $ | (901) |
Net adjustment for the period | 318 |  |  | 14 |  |  | (69) |
Balance at end of period | (638) |  |  | (956) |  |  | (970) |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |
Balance at beginning of period | (4) |  |  | 15 |  |  | (11) |
Current period changes in fair value | 21 |  |  | (17) |  |  | 19 |
Reclassification to income (1) | (12) |  |  | (1) |  |  | 11 |
Net tax impact | 1 |  |  | (1) |  |  | (4) |
Balance at end of period | 6 |  |  | (4) |  |  | 15 |
Pension and postretirement plans |  |  |  |  |
Balance at beginning of period | (4) |  |  | — |  |  | 1 |
Reclassification to income | (8) |  |  | (5) |  |  | (1) |
Net tax impact | 2 |  |  | 1 |  |  | — |
Balance at end of period | (10) |  |  | (4) |  |  | — |
Accumulated other comprehensive loss, end of period | $ | (642) |  |  | $ | (964) |  |  | $ | (955) |
(1) Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items in the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.

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