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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Dec. 31, 2024
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
The following schedules present changes in AOCI attributable to Johnson Controls (in millions):
Three Months Ended
December 31,
20242023
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 value8 (43)
Reclassification to income (1)
(1)4 
Net tax impact(1)1 
Balance at end of period2 (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.