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Equity (Tables) | 9 Months Ended
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Jun. 30, 2023
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, net of tax):
| Three Months Ended June 30,
| 2023 |  | 2022
Foreign currency translation adjustments |  |  |
Balance at beginning of period | $ | (843) |  |  | $ | (343) |
Aggregate adjustment for the period (net of tax effect of $0 and $0) | (25) |  |  | (298) |
Balance at end of period | (868) |  |  | (641) |
Realized and unrealized gains (losses) on derivatives |  |  |
Balance at beginning of period | (3) |  |  | (4) |
Current period changes in fair value (net of tax effect of $0 and $(4)) | (1) |  |  | (13) |
Reclassification to income (net of tax effect of $1 and $(3))(1) | 3 |  |  | (6) |
Balance at end of period | (1) |  |  | (23) |
Pension and postretirement plans |  |  |
Balance at beginning of period | — |  |  | 2 |
Reclassification to income (net of tax effect of $0 and $0) | (1) |  |  | — |
Balance at end of period | (1) |  |  | 2 |
Accumulated other comprehensive loss, end of period | $ | (870) |  |  | $ | (662) |
| Nine Months Ended June 30,
| 2023 |  | 2022
Foreign currency translation adjustments |  |  |
Balance at beginning of period | $ | (901) |  |  | $ | (421) |
Aggregate adjustment for the period (net of tax effect of $0 and $0) | 33 |  |  | (220) |
Balance at end of period | (868) |  |  | (641) |
Realized and unrealized gains (losses) on derivatives |  |  |
Balance at beginning of period | (11) |  |  | (17) |
Current period changes in fair value (net of tax effect of $1 and $2) | 3 |  |  | 3 |
Reclassification to income (net of tax effect of $1 and $(5))(1) | 7 |  |  | (9) |
Balance at end of period | (1) |  |  | (23) |
Pension and postretirement plans |  |  |
Balance at beginning of period | 1 |  |  | 4 |
Reclassification to income (net of tax effect of $(1) and $(1)) | (2) |  |  | (2) |
Balance at end of period | (1) |  |  | 2 |
Accumulated other comprehensive loss, end of period | $ | (870) |  |  | $ | (662) |
(1) Refer to Note 11, "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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