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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
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,
202520242023
Foreign currency translation adjustments
Balance at beginning of period$(956)$(970)$(901)
Net adjustment for the period318 14 (69)
Balance at end of period(638)(956)(970)
Realized and unrealized gains (losses) on derivatives
Balance at beginning of period(4)15 (11)
Current period changes in fair value21 (17)19 
Reclassification to income (1)
(12)(1)11 
Net tax impact1 (1)(4)
Balance at end of period6 (4)15 
Pension and postretirement plans
Balance at beginning of period(4)— 1 
Reclassification to income (8)(5)(1)
Net tax impact2 1 — 
Balance at end of period(10)(4)— 
Accumulated other comprehensive loss, end of period$(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.