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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Dec. 31, 2024
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income, Net of Tax | The following schedules present changes in AOCI attributable to Johnson Controls (in millions):
| Three Months Ended December 31, |  |
| 2024 |  | 2023 |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |  |
Balance at beginning of period | $ | (956) |  |  | $ | (970) |  |  |  |  |
Aggregate adjustment for the period | (85) |  |  | 61 |  |  |  |  |
Balance at end of period | (1,041) |  |  | (909) |  |  |  |  |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |  |
Balance at beginning of period | (4) |  |  | 15 |  |  |  |  |
Current period changes in fair value | 8 |  |  | (43) |  |  |  |  |
Reclassification to income (1) | (1) |  |  | 4 |  |  |  |  |
Net tax impact | (1) |  |  | 1 |  |  |  |  |
Balance at end of period | 2 |  |  | (23) |  |  |  |  |
Pension and postretirement plans |  |  |  |  |  |  |
Balance at beginning of period | (4) |  |  | — |  |  |  |  |
Reclassification to income | (1) |  |  | (1) |  |  |  |  |
Balance at end of period | (5) |  |  | (1) |  |  |  |  |
Accumulated other comprehensive loss, end of period | $ | (1,044) |  |  | $ | (933) |  |  |  |  |
(1) Refer to Note 9, "Derivative Instruments and Hedging Activities," of the notes to the 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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