Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating Activities of Continuing Operations
Net income from continuing operations attributable to Johnson Controls	$ 392	$ 670
Income from continuing operations attributable to noncontrolling interests	79	99
Income from continuing operations	471	769
Adjustments to reconcile net income from continuing operations to cash provided by operating activities:
Depreciation and amortization	432	419
Pension and postretirement benefit income	(51)	(299)
Pension and postretirement contributions	(76)	(25)
Equity in earnings of partially-owned affiliates, net of dividends received	20	(107)
Deferred income taxes	(97)	25
Non-cash restructuring and impairment charges	361	54
Equity-based compensation	57	32
Other - net	(64)	(64)
Changes in assets and liabilities, excluding acquisitions and divestitures:
Accounts receivable	(306)	167
Inventories	(619)	(211)
Other assets	(206)	(90)
Restructuring reserves	(19)	(24)
Accounts payable and accrued liabilities	489	510
Accrued income taxes	(68)	4
Cash provided by operating activities from continuing operations	324	1,160
Investing Activities of Continuing Operations
Capital expenditures	(260)	(197)
Sale of property, plant and equipment	35	54
Acquisition of businesses, net of cash acquired	(124)	(10)
Business divestitures, net of cash divested	16	19
Changes in long-term investments	1	15
Cash used by investing activities	(332)	(119)
Financing Activities of Continuing Operations
Increase (decrease) in short-term debt - net	2,061	225
Repayment of long-term debt	(2)	(258)
Stock repurchases and retirements	(1,035)	(661)
Payment of cash dividends	(430)	(377)
Proceeds from the exercise of stock options	13	133
Employee equity-based compensation withholding taxes	(49)	(29)
Change in noncontrolling interest share	0	(14)
Dividends paid to noncontrolling interests	(118)	(101)
Other - net	4	3
Net Cash Provided by (Used in) Financing Activities, Total	444	(1,079)
Discontinued Operations
Cash Used by Operating Activities, Discontinued Operations	(4)	(37)
Net Cash Used by Discontinued Operations	(4)	(37)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	46	9
Decrease in Cash, Cash Equivalents and Restricted Cash	478	(66)
Cash, cash equivalents and restricted cash at beginning of period	1,342	1,960
Cash, cash equivalents and restricted cash at end of period	1,820	1,894
Less: Restricted Cash	33	11
Cash and cash equivalents at end of period	$ 1,787	$ 1,883