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Equity
 3 Months Ended
Dec. 31, 2023
Stockholders' Equity Note [Abstract]  
Equity EQUITY
Share repurchase program

During the three months ended December 31, 2022, the Company repurchased and immediately retired $154 million of its ordinary shares. No shares were repurchased during the three months ended December 31, 2023.

As of December 31, 2023, approximately $3.0 billion remains available under the Company's share repurchase program, which was approved by the Company's Board of Directors in March 2021. The share repurchase program does not have an expiration date and may be amended or terminated by the Board of Directors at any time without prior notice.
Accumulated Other Comprehensive Income (Loss)

The following schedules present changes in AOCI attributable to Johnson Controls (in millions, net of tax):
Three Months Ended
December 31,
20232022
Foreign currency translation adjustments
Balance at beginning of period$(970)$(901)
Aggregate adjustment for the period61 59 
Balance at end of period(909)(842)
Realized and unrealized gains (losses) on derivatives
Balance at beginning of period15 (11)
Current period changes in fair value(43)(11)
Reclassification to income (1)
4 (3)
Net tax impact1 3 
Balance at end of period(23)(22)
Pension and postretirement plans
Balance at beginning of period— 1 
Reclassification to income(1)(1)
Balance at end of period(1)— 
Accumulated other comprehensive loss, end of period$(933)$(864)
(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.