Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Activities of Continuing Operations
Net income (loss) from continuing operations attributable to Johnson Controls	$ 107	$ (75)
Income from continuing operations attributable to noncontrolling interests	29	28
Income from discontinued operations attributable to noncontrolling interests	15	13
Income (loss) from continuing operations	136	(47)
Adjustments to reconcile net income (loss) from continuing operations to cash provided (used) by operating activities:
Depreciation and amortization	211	210
Pension and postretirement benefit income	(29)	(36)
Pension and postretirement contributions	(21)	(23)
Equity in earnings of partially-owned affiliates, net of dividends received	(36)	(33)
Deferred income taxes	43	(80)
Non-cash restructuring and impairment charges	0	28
Gain on Scott Safety business divestiture	0	(114)
Equity-based compensation	18	27
Other - net	10	0
Changes in assets and liabilities, excluding acquisitions and divestitures:
Accounts receivable	146	(10)
Inventories	(222)	(196)
Other assets	(63)	(137)
Restructuring reserves	(25)	96
Accounts payable and accrued liabilities	(226)	(259)
Accrued income taxes	(21)	441
Cash used by operating activities from continuing operations	(79)	(133)
Investing Activities of Continuing Operations
Capital expenditures	(153)	(114)
Sale of property, plant and equipment	2	5
Acquisition of businesses, net of cash acquired	(13)	0
Business divestitures, net of cash divested	6	2,011
Proceeds (payments) for equity swap	7	(15)
Changes in long-term investments	15	(7)
Cash provided (used) by investing activities from continuing operations	(136)	1,880
Financing Activities of Continuing Operations
Increase in short-term debt - net	1,014	292
Increase in long-term debt	0	885
Repayment of long-term debt	0	(2,233)
Debt financing costs	0	(4)
Stock repurchases	(467)	(150)
Payment of cash dividends	(240)	(232)
Proceeds from the exercise of stock options	13	16
Employee equity-based compensation withholding taxes	(21)	(24)
Dividends paid to noncontrolling interests	(43)	0
Cash provided (used) by financing activities from continuing operations	256	(1,450)
Cash Provided by Operating Activities, Discontinued Operations	193	6
Cash Used by Investing Activities, Discontinued Operations	(66)	(121)
Cash Provided (Used) by Financing Activities, Discontinued Operations	(11)	10
Net Cash Provided by (Used in) Discontinued Operations	116	(105)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	(43)	17
Change in cash held for sale	(2)	10
Increase in Cash, Cash Equivalents and Restricted Cash	112	219
Cash, cash equivalents and restricted cash at beginning of period	200	332
Cash, cash equivalents and restricted cash at end of period	312	551
Less: Restricted Cash	20	18
Cash and cash equivalents at end of period	$ 292	$ 533