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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Jun. 30, 2025
Stockholders' Equity Note [Abstract] |
Accumulated Other Comprehensive Income (Loss) | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table includes changes in AOCI attributable to Johnson Controls (in millions):
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Foreign currency translation adjustments |  |  |  |  |  |  |
Balance at beginning of period | $ | (1,131) |  |  | $ | (1,001) |  |  | $ | (956) |  |  | $ | (970) |
Aggregate adjustment for the period | (147) |  |  | (51) |  |  | (322) |  |  | (82) |
Balance at end of period | (1,278) |  |  | (1,052) |  |  | (1,278) |  |  | (1,052) |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |  |
Balance at beginning of period | 9 |  |  | — |  |  | (4) |  |  | 15 |
Current period changes in fair value | — |  |  | 6 |  |  | 16 |  |  | (14) |
Reclassification to income (1) | (6) |  |  | (3) |  |  | (8) |  |  | 4 |
Net tax impact | — |  |  | 1 |  |  | (1) |  |  | (1) |
Balance at end of period | 3 |  |  | 4 |  |  | 3 |  |  | 4 |
Pension and postretirement plans |  |  |  |  |  |  |
Balance at beginning of period | (6) |  |  | (2) |  |  | (4) |  |  | — |
Reclassification to income | (1) |  |  | (1) |  |  | (3) |  |  | (4) |
Net tax impact | 1 |  |  | — |  |  | 1 |  |  | 1 |
Balance at end of period | (6) |  |  | (3) |  |  | (6) |  |  | (3) |
Accumulated other comprehensive loss, end of period | $ | (1,281) |  |  | $ | (1,051) |  |  | $ | (1,281) |  |  | $ | (1,051) |
(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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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