Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating Activities
Net income (loss) attributable to Johnson Controls	$ 97	$ 251
Less: Income attributable to noncontrolling interests	73	79
Net income (loss)	170	330
Adjustments to reconcile net income to cash provided (used) by operating activities:
Depreciation and amortization	467	409
Pension and postretirement benefit income	(20)	(3)
Pension and postretirement contributions	(13)	(26)
Equity in earnings of partially-owned affiliates, net of dividends received	(102)	(55)
Deferred income taxes	(400)	(168)
Noncash restructuring and impairment charges	253	691
Equity-based compensation	56	61
Other - net	(38)	(87)
Changes in assets and liabilities, excluding acquisitions and divestitures:
Accounts receivable	(659)	(360)
Inventories	(228)	(493)
Other assets	(204)	(169)
Restructuring reserves	(60)	(17)
Accounts payable and accrued liabilities	358	(155)
Accrued income taxes	(29)	60
Cash provided (used) by operating activities	(449)	18
Investing Activities
Capital expenditures	(225)	(255)
Acquisition of businesses, net of cash acquired	1	(89)
Other - net	13	30
Cash used by investing activities	(211)	(314)
Financing Activities
Net proceeds from borrowings with maturities less than three months	1,519	1,288
Proceeds from debt	422	316
Repayments of debt	(163)	(536)
Stock repurchases and retirements	(474)	(247)
Payment of cash dividends	(504)	(481)
Employee equity-based compensation withholding taxes	(24)	(32)
Dividends paid to noncontrolling interests	(51)	(72)
Other - net	(48)	26
Cash provided by financing activities	677	262
Effect of exchange rate changes on cash, cash equivalents and restricted cash	19	8
Increase (decrease) in cash, cash equivalents and restricted cash	36	(26)
Cash, cash equivalents and restricted cash at beginning of period	924	2,066
Cash, cash equivalents and restricted cash at end of period	960	2,040
Less: Restricted cash	117	65
Cash and cash equivalents at end of period	$ 843	$ 1,975