Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income attributable to Johnson Controls	$ 1,391	$ 736
Income from continuing operations attributable to noncontrolling interests	167	147
Income from discontinued operations attributable to noncontrolling interests	0	9
Net income	1,558	892
Adjustments to reconcile net income to cash provided (used) by operating activities:
Depreciation and amortization	844	919
Pension and postretirement benefit income	(108)	(184)
Pension and postretirement contributions	(54)	(275)
Equity in earnings of partially-owned affiliates, net of dividends received	(111)	(166)
Deferred income taxes	(75)	1,056
Non-cash restructuring and impairment charges	30	70
Gain on Scott Safety business divestiture	(114)	0
Equity-based compensation	86	114
Other	(17)	3
Changes in assets and liabilities, excluding acquisitions and divestitures:
Accounts receivable	(282)	(319)
Inventories	(338)	(585)
Other assets	(64)	(258)
Restructuring reserves	(63)	22
Accounts payable and accrued liabilities	(198)	(590)
Accrued income taxes	167	(2,002)
Cash provided (used) by operating activities	1,261	(1,303)
Investing Activities
Capital expenditures	(782)	(996)
Sale of property, plant and equipment	23	23
Acquisition of businesses, net of cash acquired	(24)	(6)
Business divestitures	2,101	180
Changes in long-term investments	(14)	(33)
Cash provided (used) by investing activities	1,304	(832)
Financing Activities
Increase in short-term debt - net	350	887
Increase in long-term debt	886	1,553
Repayment of long-term debt	(2,760)	(972)
Debt financing costs	(4)	(18)
Stock repurchases	(255)	(426)
Payment of cash dividends	(714)	(469)
Proceeds from the exercise of stock options	39	130
Employee equity-based compensation withholding taxes	(39)	(34)
Change in noncontrolling interest share	15	8
Dividends paid to noncontrolling interests	(46)	(78)
Dividend from Adient spin-off	0	2,050
Cash transferred to Adient related to spin-off	0	(665)
Cash paid related to prior acquistions	0	(75)
Other	0	6
Cash provided (used) by financing activities	(2,528)	1,897
Effect of exchange rate changes on cash and cash equivalents	(84)	12
Change in cash held for sale	9	105
Decrease in cash and cash equivalents	(38)	(121)
Cash and cash equivalents at beginning of period	321	579
Cash and cash equivalents at end of period	$ 283	$ 458