Johnson Controls International (JCI) 10-K 16 Nov 20 2020 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Sep. 30, 2020	Oct. 31, 2020	Mar. 31, 2020
Cover [Abstract]
Documents Incorporated by Reference [Text Block]	Portions of the definitive Proxy Statement to be delivered to shareholders in connection with the annual general meeting of shareholders to be held on March 10, 2021 are incorporated by reference into Part III.
Document Information [Line Items]
Entity Incorporation, State or Country Code	L2
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Public Float			$ 20
Entity Common Stock, Shares Outstanding		723,907,803
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2020
Entity File Number	001-13836
Entity Registrant Name	JOHNSON CONTROLS INTERNATIONAL PLC
Entity Tax Identification Number	98-0390500
Entity Central Index Key	0000833444
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Amendment Flag	false
Document Transition Report	false
City Area Code	353
Local Phone Number	21-423-5000
Entity Address, Address Line One	One Albert Quay
Entity Address, City or Town	Cork
Entity Address, Country	IE
Entity Address, Postal Zip Code	T12 X8N6
Ordinary Shares, Par Value 0.01 [Domain]
Document Information [Line Items]
Title of 12(b) Security	Ordinary Shares, Par Value $0.01
Trading Symbol	JCI
Security Exchange Name	NYSE
Notes 4.250 Percent Due 2021 [Domain]
Document Information [Line Items]
Title of 12(b) Security	4.25% Senior Notes due 2021
Trading Symbol	JCI21B
Security Exchange Name	NYSE
Notes 3.750 Percent Due 2021 [Domain]
Document Information [Line Items]
Title of 12(b) Security	3.750% Senior Notes due 2021
Trading Symbol	JCI21C
Security Exchange Name	NYSE
Notes 4.625 Percent Due 2023 [Domain]
Document Information [Line Items]
Title of 12(b) Security	4.625% Notes due 2023
Trading Symbol	JCI23
Security Exchange Name	NYSE
Notes 1.000 Percent Due 2023 [Domain]
Document Information [Line Items]
Title of 12(b) Security	1.000% Senior Notes due 2023
Trading Symbol	JCI23A
Security Exchange Name	NYSE
Notes 3.625 Percent Due 2024 [Domain]
Document Information [Line Items]
Title of 12(b) Security	3.625% Senior Notes due 2024
Trading Symbol	JCI24A
Security Exchange Name	NYSE
Notes 1.375 Percent Due 2025 [Domain]
Document Information [Line Items]
Title of 12(b) Security	1.375% Notes due 2025
Trading Symbol	JCI25A
Security Exchange Name	NYSE
Notes 3.900 Percent Due 2026 [Domain]
Document Information [Line Items]
Title of 12(b) Security	3.900% Notes due 2026
Trading Symbol	JCI26A
Security Exchange Name	NYSE
Notes 0.375 Percent Due 2027 [Domain]
Document Information [Line Items]
Title of 12(b) Security	0.375% Senior Notes due 2027
Trading Symbol	JCI27
Security Exchange Name	NYSE
Notes 1.750 Percent Due 2030 [Domain]
Document Information [Line Items]
Title of 12(b) Security	1.750% Senior Notes due 2030
Trading Symbol	JCI30
Security Exchange Name	NYSE
Notes 1.000 Percent Due 2032 [Domain]
Document Information [Line Items]
Title of 12(b) Security	1.000% Senior Notes due 2032
Trading Symbol	JCI32
Security Exchange Name	NYSE
Notes 6.000 Percent Due 2036 [Domain]
Document Information [Line Items]
Title of 12(b) Security	6.000% Notes due 2036
Trading Symbol	JCI36A
Security Exchange Name	NYSE
Notes 5.700 Percent Due 2041 [Domain]
Document Information [Line Items]
Title of 12(b) Security	5.70% Senior Notes due 2041
Trading Symbol	JCI41B
Security Exchange Name	NYSE
Notes 5.250 Percent Due 2041 [Domain]
Document Information [Line Items]
Title of 12(b) Security	5.250% Senior Notes due 2041
Trading Symbol	JCI41C
Security Exchange Name	NYSE
Notes 4.625 Percent Due 2044 [Domain]
Document Information [Line Items]
Title of 12(b) Security	4.625% Senior Notes due 2044
Trading Symbol	JCI44A
Security Exchange Name	NYSE
Notes 5.125 Percent Due 2045 [Domain]
Document Information [Line Items]
Title of 12(b) Security	5.125% Notes due 2045
Trading Symbol	JCI45B
Security Exchange Name	NYSE
Debentures 6.950 Percent Due December 1, 2045 [Domain]
Document Information [Line Items]
Title of 12(b) Security	6.950% Debentures due December 1, 2045
Trading Symbol	JCI45A
Security Exchange Name	NYSE
Notes 4.500 Percent Due 2047 [Domain]
Document Information [Line Items]
Title of 12(b) Security	4.500% Senior Notes due 2047
Trading Symbol	JCI47
Security Exchange Name	NYSE
Notes 4.950 Percent Due 2064 [Domain]
Document Information [Line Items]
Title of 12(b) Security	4.950% Senior Notes due 2064
Trading Symbol	JCI64A
Security Exchange Name	NYSE

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 22,317	$ 23,968	$ 23,400
Cost of sales	14,906	16,275	15,733
Gross profit	7,411	7,693	7,667
Selling, general and administrative expenses	(5,665)	(6,244)	(5,642)
Restructuring and impairment costs	(783)	(235)	(255)
Net financing charges	(231)	(350)	(401)
Equity income	171	192	177
Income from continuing operations before income taxes	903	1,056	1,546
Income tax provision (benefit)	108	(233)	197
Income from continuing operations	795	1,289	1,349
Income from discontinued operations, net of tax (Note 3)	0	4,598	1,034
Net income	795	5,887	2,383
Income from continuing operations attributable to noncontrolling interests	164	189	174
Income from discontinued operations attributable to noncontrolling interests	0	24	47
Net income attributable to Johnson Controls	631	5,674	2,162
Amounts attributable to Johnson Controls, Inc. common shareholders
Income from continuing operations	631	1,100	1,175
Income from discontinued operations	$ 0	$ 4,574	$ 987
Earnings per share
Basic earnings per share from continuing operations	$ 0.84	$ 1.26	$ 1.27
Basic earnings per share from discontinued operations	0	5.26	1.07
Basic earnings per share	0.84	6.52	2.34
Diluted earnings per share from continuing operations	0.84	1.26	1.26
Diluted earnings per share from discontinued operations	0	5.23	1.06
Diluted earnings per share	$ 0.84	$ 6.49	$ 2.32
Products and Systems [Member]
Net sales	$ 16,253	$ 17,711	$ 17,332
Cost of sales	11,401	12,577	12,315
Services [Member]
Net sales	6,064	6,257	6,068
Cost of sales	$ 3,505	$ 3,698	$ 3,418

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 795	$ 5,887	$ 2,383
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	25	(342)	(483)
Realized and unrealized gains (losses) on derivatives	8	6	(29)
Realized and unrealized gains on marketable securities	0	0	4
Pension and postretirement plans	8	(6)	0
Other comprehensive income (loss)	41	(342)	(508)
Total comprehensive income	836	5,545	1,875
Comprehensive income attributable to noncontrolling interests	186	195	186
Comprehensive income attributable to Johnson Controls	$ 650	$ 5,350	$ 1,689

Consolidated Statements of Fina

Consolidated Statements of Financial Position $ in Millions	Sep. 30, 2020USD ($)$ / sharesshares	Sep. 30, 2020€ / shares	Sep. 30, 2019USD ($)$ / sharesshares	Sep. 30, 2019€ / shares
Assets
Cash and cash equivalents	$ 1,951		$ 2,805
Accounts receivable, less allowance for doubtful accounts of $173 and $173, respectively	5,294		5,770
Inventories	1,773		1,814
Assets held for sale	0		98
Other current assets	1,035		1,906
Current assets	10,053		12,393
Property, plant and equipment - net	3,059		3,348
Goodwill	17,932		18,178
Other intangible assets - net	5,356		5,632
Investments in partially-owned affiliates	914		853
Noncurrent assets held for sale	147		60
Other noncurrent assets	3,354		1,823
Total assets	40,815		42,287
Liabilities and Equity
Short-term debt	31		10
Current portion of long-term debt	262		501
Accounts payable	3,120		3,582
Accrued compensation and benefits	838		953
Deferred revenue	1,435		1,407
Liabilities held for sale	0		44
Other current liabilities	2,562		2,573
Current liabilities	8,248		9,070
Long-term debt	7,526		6,708
Pension and postretirement benefits	1,140		1,044
Other noncurrent liabilities	5,368		4,636
Long-term liabilities	14,034		12,388
Ordinary shares	8		8
Ordinary A shares	0		0
Preferred shares	0		0
Ordinary shares held in treasury, at cost (2020 - 27,684,632; 2019 - 26,864,793 shares)	(1,119)		(1,086)
Capital in excess of par value	16,865		16,812
Retained earnings	2,469		4,827
Accumulated other comprehensive loss	(776)		(795)
Shareholders’ equity attributable to Johnson Controls	17,447		19,766
Noncontrolling interests	1,086		1,063
Total equity	18,533		20,829
Total liabilities and equity	40,815		42,287
Allowance for doubtful accounts	$ 173		$ 173
Preferred shares, par or stated value per share | $ / shares	$ 0.01		$ 0.01
Preferred shares authorized | shares	200,000,000		200,000,000
Preferred shares issued | shares	0		0
Ordinary shares held in treasury, at cost | shares	27,684,632		26,864,793
Allowance for doubtful accounts	$ 173		$ 173
Ordinary shares, par value | $ / shares	$ 0.01		$ 0.01
Ordinary shares authorized | shares	2,000,000,000		2,000,000,000
Ordinary shares issued | shares	753,907,315		804,495,430
Preferred shares authorized | shares	200,000,000		200,000,000
Preferred shares issued | shares	0		0
Preferred shares, par or stated value per share | $ / shares	$ 0.01		$ 0.01
Ordinary shares held in treasury, at cost | shares	27,684,632		26,864,793
Common Class A [Member]
Ordinary shares, par value | € / shares		€ 1		€ 1
Ordinary shares authorized | shares	40,000		40,000
Ordinary shares issued | shares	0		0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating Activities of Continuing Operations
Net income from continuing operations attributable to Johnson Controls	$ 631	$ 1,100	$ 1,175
Income from continuing operations attributable to noncontrolling interests	164	189	174
Net income from continuing operations	795	1,289	1,349
Adjustments to reconcile net income from continuing operations to cash provided by operating activities:
Depreciation and amortization	822	825	824
Pension and postretirement benefit expense (income)	118	515	(170)
Pension and postretirement contributions	(61)	(53)	(56)
Equity in earnings of partially-owned affiliates, net of dividends received	(36)	(34)	(128)
Deferred income taxes	(537)	612	(739)
Non-cash restructuring and impairment charges	582	235	36
Gain on Scott Safety business divestiture	0	0	(114)
Equity-based compensation	74	95	106
Other - net	(90)	29	(35)
Changes in assets and liabilities, excluding acquisitions and divestitures:
Accounts receivable	534	(312)	(475)
Inventories	45	(72)	(103)
Other assets	(52)	(99)	(171)
Restructuring reserves	(29)	(121)	1
Accounts payable and accrued liabilities	(717)	56	340
Accrued income taxes	1,031	(1,222)	855
Cash provided by operating activities from continuing operations	2,479	1,743	1,520
Investing Activities of Continuing Operations
Capital expenditures	(443)	(586)	(645)
Sale of property, plant and equipment	127	27	48
Acquisition of businesses, net of cash acquired	(77)	(25)	(21)
Business divestitures, net of cash divested	135	12	2,202
Changes in long-term investments	0	25	(1)
Proceeds (payments) for equity swap	0	14	(15)
Cash provided (used) by investing activities from continuing operations	(258)	(533)	1,568
Financing Activities of Continuing Operations
Increase (decrease) in short-term debt - net	(33)	(1,296)	96
Increase in long-term debt	1,804	0	1,136
Repayment of long-term debt	(1,386)	(2,333)	(3,704)
Debt financing costs	(12)	0	(4)
Stock repurchases and retirements	(2,204)	(5,983)	(300)
Payment of cash dividends	(790)	(920)	(954)
Proceeds from the exercise of stock options	75	171	66
Dividends paid to noncontrolling interests	(114)	(132)	(43)
Cash received for prior divestitures	2	4	0
Employee equity-based compensation withholding	(34)	(31)	(42)
Cash paid to acquire a noncontrolling interest	(132)	0	0
Other - net	0	1	0
Cash used by financing activities from continuing operations	(2,824)	(10,519)	(3,749)
Cash Provided (Used) by Operating Activities, Discontinued Operations	(260)	(541)	996
Cash Provided (Used) by Investing Activities, Discontinued Operations	0	12,611	(372)
Cash Used by Financing Activities, Discontinued Operations	(113)	(35)	(3)
Cash Provided (Used) by Discontinued Operations	(373)	12,035	621
Effect of exchange rate changes on cash, cash equivalents and restricted cash	115	(120)	(106)
Change in cash, cash equivalents and restricted cash held for sale	0	15	14
Increase (decrease) in cash, cash equivalents and restricted cash	(861)	2,621	(132)
Cash, cash equivalents and restricted cash at beginning of period	2,821	200	332
Cash, cash equivalents and restricted cash at end of period	1,960	2,821	200
Less: Restricted cash	9	16	15
Cash and cash equivalents at end of period	$ 1,951	$ 2,805	$ 185

Consolidated Statements of Shar

Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Ordinary Shares	Ordinary SharesCumulative Effect, Period of Adoption, Adjustment	Capital in excess of par value	Capital in excess of par valueCumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Treasury Stock, at Cost	Treasury Stock, at CostCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)Cumulative Effect, Period of Adoption, Adjustment	Power Solutions	Power SolutionsOrdinary Shares	Power SolutionsCapital in excess of par value	Power SolutionsRetained Earnings	Power SolutionsTreasury Stock, at Cost	Power SolutionsAccumulated Other Comprehensive Income (Loss)
Beginning balance at Sep. 30, 2017	$ 20,447		$ 9		$ 16,390		$ 5,231		$ (710)		$ (473)
Beginning balance (Adoption of ASU 2016-09) at Sep. 30, 2017		$ (179)		$ 0		$ 0		$ 179		$ 0		$ 0
Comprehensive income (loss)	1,689		0		0		2,162		0		(473)
Cash dividends	$ (968)		0		0		$ (968)		0		0
Cash dividends ordinary, per share	$ 1.04						$ 1.04
Repurchases and retirements of ordinary shares	$ (300)		0		0		$ 0		(300)		0
Other, including options exercised	117		1		159		0		(43)		0
Ending balance at Sep. 30, 2018	21,164		10		16,549		6,604		(1,053)		(946)
Ending balance (Adoption of ASC 606) at Sep. 30, 2018		(45)		0		0		(45)		0		0
Ending balance (Adoption of ASU 2016-01) at Sep. 30, 2018		0		0		0		8		0		(8)
Ending balance (Adoption of 2016-16) at Sep. 30, 2018		(546)		0		0		(546)		0		0
Comprehensive income (loss)	5,350		0		0		5,674		0		(324)
Cash dividends	$ (887)		0		0		$ (887)		0		0
Cash dividends ordinary, per share	$ 1.04						$ 1.04
Repurchases and retirements of ordinary shares	$ (5,983)		(2)		0		$ (5,981)		0		0
Divestiture of Power Solutions													$ 483	$ 0	$ 0	$ 0	$ 0	$ 483
Other, including options exercised	230		0		263		0		(33)		0
Ending balance at Sep. 30, 2019	19,766		8		16,812		4,827		(1,086)		(795)
Ending balance (Adoption of ASC 842) at Sep. 30, 2019		$ (5)		$ 0		$ 0		$ (5)		$ 0		$ 0
Comprehensive income (loss)	650		0		0		631		0		19
Cash dividends	$ (780)		0		0		$ (780)		0		0
Cash dividends ordinary, per share	$ 1.04						$ 1.04
Repurchases and retirements of ordinary shares	$ (2,204)		0		0		$ (2,204)		0		0
Change in noncontrolling interest share	(83)		0		(83)		0		0		0
Other, including options exercised	103		0		136		0		(33)		0
Ending balance at Sep. 30, 2020	$ 17,447		$ 8		$ 16,865		$ 2,469		$ (1,119)		$ (776)

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES The consolidated financial statements include the consolidated accounts of Johnson Controls International plc, a corporation organized under the laws of Ireland, and its subsidiaries (Johnson Controls International plc and all its subsidiaries, hereinafter collectively referred to as the "Company," "Johnson Controls" or "JCI plc"). Nature of Operations Johnson Controls International plc, headquartered in Cork, Ireland, is a global diversified technology and multi-industrial leader, serving a wide range of customers in more than 150 countries. The Company’s products and solutions enable smart, energy efficient, sustainable buildings that work seamlessly together to advance the safety, comfort and intelligence of spaces to power its customers’ mission. The Company is committed to helping its customers win and creating greater value for all of its stakeholders through its strategic focus on buildings. In 2019, the Company sold its Power Solutions business to BCP Acquisitions LLC ("Purchaser"), an entity controlled by investment funds managed by Brookfield Capital Partners LLC, completing the Company’s transformation into a pure-play building technologies and solutions provider. The transaction closed on April 30, 2019 with net cash proceeds of $11.6 billion after tax and transaction-related expenses. Refer to Note 3, "Discontinued Operations," of the notes to consolidated financial statements for further information. The Company is a global leader in engineering, manufacturing and commissioning building products and systems, including residential and commercial heating, ventilating, air-conditioning ("HVAC") equipment, industrial refrigeration systems, controls, security systems, fire detection systems and fire suppression solutions. The Company further serves customers by providing technical services, including maintenance, repair, retrofit and replacement of equipment (in the HVAC, security and fire-protection space), energy-management consulting and data-driven “smart building” services and solutions powered by its digital platforms and capabilities. Principles of Consolidation The consolidated financial statements include the consolidated accounts of Johnson Controls International plc and its subsidiaries that are consolidated in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP"). All significant intercompany transactions have been eliminated. The results of companies acquired or disposed of during the year are included in the consolidated financial statements from the effective date of acquisition or up to the date of disposal. Investments in partially-owned affiliates are accounted for by the equity method when the Company’s interest exceeds 20% and the Company does not have a controlling interest. The Company consolidates variable interest entities ("VIE") in which the Company has the power to direct the significant activities of the entity and the obligation to absorb losses or receive benefits from the entity that may be significant. The Company did not have a significant variable interest in any consolidated or nonconsolidated VIEs in its continuing operations for the presented reporting periods. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Fair Value of Financial Instruments The fair values of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. See Note 10, "Derivative Instruments and Hedging Activities," and Note 11, "Fair Value Measurements," of the notes to consolidated financial statements for fair value of financial instruments, including derivative instruments, hedging activities and long-term debt. Assets and Liabilities Held for Sale The Company classifies assets and liabilities (disposal groups) to be sold as held for sale in the period in which all of the following criteria are met: management, having the authority to approve the action, commits to a plan to sell the disposal group; the disposal group is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such disposal groups; an active program to locate a buyer and other actions required to complete the plan to sell the disposal group have been initiated; the sale of the disposal group is probable, and transfer of the disposal group is expected to qualify for recognition as a completed sale within one year, except if events or circumstances beyond the Company's control extend the period of time required to sell the disposal group beyond one year; the disposal group is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. In addition, the Company classifies disposal groups to be disposed of other than by sale (e.g. spin-off) as held for sale in the period the disposal occurs. The Company initially measures a disposal group that is classified as held for sale at the lower of its carrying value or fair value less any costs to sell. Any loss resulting from this measurement is recognized in the period in which the held for sale criteria are met. Conversely, gains are not recognized on the sale of a disposal group until the date of sale. The Company assesses the fair value of a disposal group, less any costs to sell, each reporting period it remains classified as held for sale and reports any subsequent changes as an adjustment to the carrying value of the disposal group, as long as the new carrying value does not exceed the carrying value of the disposal group at the time it was initially classified as held for sale. Upon determining that a disposal group meets the criteria to be classified as held for sale, the Company reports the assets and liabilities of the disposal group, if material, in the line items assets held for sale and liabilities held for sale in the consolidated statements of financial position. Refer to Note 3, "Discontinued Operations," of the notes to consolidated financial statements for further information. Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Restricted Cash At September 30, 2020 and September 30, 2019, the Company held restricted cash of approximately $9 million and $16 million, respectively all of which was recorded within other current assets in the consolidated statements of financial position. These amounts related to cash restricted for payment of asbestos liabilities. Receivables Receivables consist of amounts billed and currently due from customers and unbilled costs and accrued profits related to revenues on long-term contracts that have been recognized for accounting purposes but not yet billed to customers. The Company extends credit to customers in the normal course of business and maintains an allowance for doubtful accounts resulting from the inability or unwillingness of customers to make required payments. The allowance for doubtful accounts is based on historical experience, existing economic conditions and any specific customer collection issues the Company has identified. The Company enters into supply chain financing programs to sell certain accounts receivable without recourse to third-party financial institutions. Sales of accounts receivable are reflected as a reduction of accounts receivable in the consolidated statements of financial position and the proceeds are included in cash flows from operating activities in the consolidated statements of cash flows. Inventories Inventories are stated at the lower of cost or market using the first-in, first-out ("FIFO") method. Finished goods and work-in-process inventories include material, labor and manufacturing overhead costs. Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is provided over the estimated useful lives of the respective assets using the straight-line method for financial reporting purposes and accelerated methods for income tax purposes. The estimated useful lives generally range from 3 to 40 years for buildings and improvements, subscriber systems up to 15 years, and from 3 to 15 years for machinery and equipment. The Company capitalizes interest on borrowings during the active construction period of major capital projects. Capitalized interest is added to the cost of the underlying assets and is amortized over the useful lives of the assets. Goodwill and Indefinite-Lived Intangible Assets Goodwill reflects the cost of an acquisition in excess of the fair values assigned to identifiable net assets acquired. The Company reviews goodwill for impairment during the fourth fiscal quarter or more frequently if events or changes in circumstances indicate the asset might be impaired. The Company performs impairment reviews for its reporting units, which have been determined to be the Company’s reportable segments or one level below the reportable segments in certain instances, using a fair value method based on management’s judgments and assumptions or third party valuations. The fair value of a reporting unit refers to the price that would be received to sell the unit as a whole in an orderly transaction between market participants at the measurement date. In estimating the fair value, the Company uses multiples of earnings based on the average of published multiples of earnings of comparable entities with similar operations and economic characteristics and applies the multiples to the Company's average of historical and future financial results for each reporting unit. In certain instances, the Company uses discounted cash flow analyses or estimated sales price to further support the fair value estimates. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." The estimated fair value is then compared with the carrying amount of the reporting unit, including recorded goodwill. The Company is subject to financial statement risk to the extent that the carrying amount exceeds the estimated fair value. Refer to Note 7, "Goodwill and Other Intangible Assets," of the notes to consolidated financial statements for information regarding the goodwill impairment testing performed in fiscal years 2020, 2019 and 2018. Indefinite-lived intangible assets are also subject to at least annual impairment testing. Indefinite-lived intangible assets primarily consist of trademarks and trade names and are tested for impairment using a relief-from-royalty method. A considerable amount of management judgment and assumptions are required in performing the impairment tests. Leases Lessee arrangements The Company leases certain administrative, production and other facilities, fleet vehicles, information technology equipment and other equipment under arrangements that are accounted for as operating leases. The Company determines whether an arrangement contains a lease at contract inception based on whether the arrangement involves the use of a physically distinct identified asset and whether the Company has the right to obtain substantially all of the economic benefits from the use of the asset throughout the period as well as the right to direct the use of the asset. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. Right-of-use assets and the corresponding lease liabilities are recognized at commencement date based on the present value of lease payments for all leases with terms longer than twelve months. As the majority of the Company's leases do not provide an implicit interest rate, to determine the present value of lease payments, the Company uses its incremental borrowing rate based on information available on the lease commencement date and uses the implicit rate when readily determinable. The Company determines its incremental borrowing rate based on a comparable market yield curve consistent with the Company's credit rating, term of the lease and relative economic environment. The Company has elected to combine lease and nonlease components for its leases. Lessor arrangements The Company's monitoring services and maintenance agreements within its security business that include subscriber system assets for which the Company retains ownership contain both lease and nonlease components. The Company has elected the practical expedient to combine lease and nonlease components for these arrangements where the timing and pattern of transfer of the lease and nonlease components are the same and the lease component would be classified as an operating lease if accounted for separately. The Company has concluded that in these arrangements the nonlease components are the predominant characteristic, and as a result, the combined component is accounted for under the revenue guidance. Impairment of Long-Lived Assets The Company reviews long-lived assets, including right-of-use assets under operating leases, other tangible assets and intangible assets with definitive lives, for impairment whenever events or changes in circumstances indicate that the asset’s carrying amount may not be recoverable. The Company conducts its long-lived asset impairment analyses in accordance with ASC 360-10-15, "Impairment or Disposal of Long-Lived Assets," ASC 350-30, "General Intangibles Other than Goodwill" and ASC 985-20, "Costs of Software to be Sold, Leased, or Marketed." The Company groups assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities and evaluates the asset group against the sum of the undiscounted future cash flows. If the undiscounted cash flows do not indicate the carrying amount of the asset group is recoverable, an impairment charge is measured as the amount by which the carrying amount of the asset group exceeds its fair value based on discounted cash flow analysis or appraisals. Intangible assets acquired in a business combination that are used in research and development activities are considered indefinite-lived until the completion or abandonment of the associated research and development efforts. During the period that those assets are considered indefinite lived, they are not amortized but are tested for impairment annually and more frequently if events or changes in circumstances indicate that it is more likely than not that the asset is impaired. If the carrying amount of an intangible asset exceeds its fair value, the Company recognizes an impairment loss in an amount equal to that excess. Unamortized capitalized costs of a computer software product are compared to the net realizable value of the product. The amount by which the unamortized capitalized costs of a computer software product exceed the net realizable value of that asset is written off. Refer to Note 17, "Impairment of Long-Lived Assets," of the notes to consolidated financial statements for information regarding the impairment testing performed in fiscal years 2020, 2019 and 2018. Revenue Recognition The Company recognizes revenue from certain long-term contracts to design, manufacture and install building products and systems as well as unscheduled repair or replacement services on an over time basis, with progress towards completion measured using a cost-to-cost input method based on the relationship between actual costs incurred and total estimated costs at completion. The cost-to-cost input method is used as it best depicts the transfer of control to the customer that occurs as the Company incurs costs. Changes to the original estimates may be required during the life of the contract and such estimates are reviewed monthly. If contract modifications result in additional goods or services that are distinct from those transferred before the modification, they are accounted for prospectively as if the Company entered into a new contract. If the goods or services in the modification are not distinct from those in the original contract, sales and gross profit are adjusted using the cumulative catch-up method for revisions in estimated total contract costs and contract values. Estimated losses are recorded when identified. The Company does not adjust the promised amount of consideration for the effects of a significant financing component as at contract inception the Company expects to receive the payment within twelve months of transfer of goods or services. The Company enters into extended warranties and long-term service and maintenance agreements with certain customers. For these arrangements, revenue is recognized over time on a straight-line basis over the respective contract term. The Company also sells certain HVAC and refrigeration products and services in bundled arrangements with multiple performance obligations, such as equipment, commissioning, service labor and extended warranties. Approximately four to twelve months separate the timing of the first deliverable until the last piece of equipment is delivered, and there may be extended warranty arrangements with duration of one to five years commencing upon the end of the standard warranty period. In addition, the Company sells security monitoring systems that may have multiple performance obligations, including equipment, installation, monitoring services and maintenance agreements. Revenues associated with sale of equipment and related installations are recognized over time on a cost-to-cost input method, while the revenue for monitoring and maintenance services are recognized over time as services are rendered. The transaction price is allocated to each performance obligation based on the relative selling price method. In order to estimate relative selling price, market data and transfer price studies are utilized. If the standalone selling price is not directly observable, the Company estimates the standalone selling price using an adjusted market assessment approach or expected cost plus margin approach. For transactions in which the Company retains ownership of the subscriber system asset, fees for monitoring and maintenance services are recognized over time on a straight-line basis over the contract term. Non-refundable fees received in connection with the initiation of a monitoring contract, along with associated direct and incremental selling costs, are deferred and amortized over the estimated life of the contract. In all other cases, the Company recognizes revenue at the point in time when control over the goods or services transfers to the customer. The Company considers the contractual consideration payable by the customer and assesses variable consideration that may affect the total transaction price, including discounts, rebates, refunds, credits or other similar sources of variable consideration, when determining the transaction price of each contract. The Company includes variable consideration in the estimated transaction price when it is probable that significant reversal of revenue recognized would not occur when the uncertainty associated with variable consideration is subsequently resolved. These estimates are based on the amount of consideration that the Company expects to be entitled to. Shipping and handling costs billed to customers are included in sales and the related costs are included in cost of sales when control transfers to the customer. The Company presents amounts collected from customers for sales and other taxes net of the related amounts remitted. Subscriber System Assets, Dealer Intangibles and Related Deferred Revenue Accounts The Company considers assets related to the acquisition of new customers in its electronic security business in three asset categories: internally generated residential subscriber systems outside of North America, internally generated commercial subscriber systems (collectively referred to as subscriber system assets) and customer accounts acquired through the ADT dealer program, primarily outside of North America (referred to as dealer intangibles). Subscriber system assets include installed property, plant and equipment for which the Company retains ownership and deferred costs directly related to the customer acquisition and system installation. Subscriber system assets represent capitalized equipment (e.g. security control panels, touch pad, motion detectors, window sensors, and other equipment) and installation costs associated with electronic security monitoring arrangements under which the Company retains ownership of the security system assets in a customer's place of business, or outside of North America, residence. Installation costs represent costs incurred to prepare the asset for its intended use. The Company pays property taxes on the subscriber system assets and upon customer termination, may retrieve such assets. These assets embody a probable future economic benefit as they generate future monitoring revenue for the Company. Costs related to the subscriber system equipment and installation are categorized as property, plant and equipment rather than deferred costs. Deferred costs associated with subscriber system assets represent direct and incremental selling expenses (such as commissions) related to acquiring the customer. Commissions related to up-front consideration paid by customers in connection with the establishment of the monitoring arrangement are determined based on a percentage of the up-front fees and do not exceed deferred revenue. Such deferred costs are recorded as other current and noncurrent assets within the consolidated statements of financial position. Subscriber system assets and any deferred revenue resulting from the customer acquisition are accounted for over the expected life of the subscriber. In certain geographical areas where the Company has a large number of customers that behave in a similar manner over time, the Company accounts for subscriber system assets and related deferred revenue using pools, with separate pools for the components of subscriber system assets and any related deferred revenue based on the same month and year of acquisition. The Company depreciates its pooled subscriber system assets and related deferred revenue using a straight-line method with lives up to 12 years and considering customer attrition. The Company uses a straight-line method with a 15-year life for non-pooled subscriber system assets (primarily in Europe, Latin America and Asia) and related deferred revenue, with remaining balances written off upon customer termination. Certain contracts and related customer relationships result from purchasing residential security monitoring contracts from an external network of independent dealers who operate under the ADT dealer program, primarily outside of North America. Acquired contracts and related customer relationships are recorded at their contractually determined purchase price. During the first 6 months (12 months in certain circumstances) after the purchase of the customer contract, any cancellation of monitoring service, including those that result from customer payment delinquencies, results in a chargeback by the Company to the dealer for the full amount of the contract purchase price. The Company records the amount charged back to the dealer as a reduction of the previously recorded intangible asset. Intangible assets arising from the ADT dealer program described above are amortized in pools determined by the same month and year of contract acquisition on a straight-line basis over the period of the customer relationship. The estimated useful life of dealer intangibles ranges from 12 to 15 years. Research and Development Costs Expenditures for research activities relating to product development and improvement are charged against income as incurred and included within selling, general and administrative expenses for continuing operations in the consolidated statements of income. Such expenditures for the years ended September 30, 2020, 2019 and 2018 were $274 million, $319 million and $310 million, respectively. Earnings Per Share The Company presents both basic and diluted earnings per share ("EPS") amounts. Basic EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of common shares outstanding during the reporting period. Diluted EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of common shares and common equivalent shares outstanding during the reporting period that are calculated using the treasury stock method for stock options, unvested restricted stock and unvested performance share awards. See Note 13, "Earnings per Share," of the notes to consolidated financial statements for the calculation of earnings per share. Foreign Currency Translation Substantially all of the Company’s international operations use the respective local currency as the functional currency. Assets and liabilities of international entities have been translated at period-end exchange rates, and income and expenses have been translated using average exchange rates for the period. Monetary assets and liabilities denominated in non-functional currencies are adjusted to reflect period-end exchange rates. The aggregate transaction gains (losses), net of the impact of foreign currency hedges, included in income from continuing operations for the years ended September 30, 2020, 2019 and 2018 were $(32) million, $(10) million and $1 million, respectively. Derivative Financial Instruments The Company has written policies and procedures that place all financial instruments under the direction of Corporate treasury and restrict all derivative transactions to those intended for hedging purposes. The use of financial instruments for speculative purposes is strictly prohibited. The Company selectively uses financial instruments to manage the market risk from changes in foreign exchange rates, commodity prices, stock-based compensation liabilities and interest rates. The fair values of all derivatives are recorded in the consolidated statements of financial position. The change in a derivative’s fair value is recorded each period in current earnings or accumulated other comprehensive income ("AOCI"), depending on whether the derivative is designated as part of a hedge transaction and if so, the type of hedge transaction. See Note 10, "Derivative Instruments and Hedging Activities," and Note 11, "Fair Value Measurements," of the notes to consolidated financial statements for disclosure of the Company’s derivative instruments and hedging activities. Investments The Company invests in debt and equity securities which are marked to market at the end of each accounting period. For fiscal 2020 and 2019, unrealized gains and losses on these securities are recognized in the Company's consolidated statements of income. For periods prior to fiscal 2019, the unrealized gains and losses on these securities, other than the deferred compensation plan assets, were recognized in AOCI within the consolidated statement of shareholders' equity unless an unrealized loss is deemed to be other than temporary, in which case such loss was charged to earnings. The deferred compensation plan assets are marked to market at the end of each accounting period and all unrealized gains and losses are recorded in the consolidated statements of income. Pension and Postretirement Benefits The Company utilizes a mark-to-market approach for recognizing pension and postretirement benefit expenses, including measuring the market related value of plan assets at fair value and recognizing actuarial gains and losses in the fourth quarter of each fiscal year or at the date of a remeasurement event. Refer to Note 15, "Retirement Plans," of the notes to consolidated financial statements for disclosure of the Company's pension and postretirement benefit plans. Loss Contingencies Accruals are recorded for various contingencies including legal proceedings, environmental matters, self-insurance and other claims that arise in the normal course of business. The accruals are based on judgment, the probability of losses and, where applicable, the consideration of opinions of internal and/or external legal counsel and actuarially determined estimates. Additionally, the Company records receivables from third party insurers when recovery has been determined to be probable. The Company is subject to laws and regulations relating to protecting the environment. The Company provides for expenses associated with environmental remediation obligations when such amounts are probable and can be reasonably estimated. Refer to Note 22, "Commitments and Contingencies," of the notes to consolidated financial statements. The Company records liabilities for its workers' compensation, product, general and auto liabilities. The determination of these liabilities and related expenses is dependent on claims experience. For most of these liabilities, claims incurred but not yet reported are estimated by utilizing actuarial valuations based upon historical claims experience. The Company records receivables from third party insurers when recovery has been determined to be probable. The Company maintains captive insurance companies to manage its insurable liabilities. Asbestos-Related Contingencies and Insurance Receivables The Company and certain of its subsidiaries along with numerous other companies are named as defendants in personal injury lawsuits based on alleged exposure to asbestos-containing materials. The Company's estimate of the liability and corresponding insurance recovery for pending and future claims and defense costs is based on the Company's historical claim experience, and estimates of the number and resolution cost of potential future claims that may be filed and is discounted to present value from 2068 (which is the Company's reasonable best estimate of the actuarially determined time period through which asbestos-related claims will be filed against Company affiliates). Asbestos-related defense costs are included in the asbestos liability. The Company's legal strategy for resolving claims also impacts these estimates. The Company considers various trends and developments in evaluating the period of time (the look-back period) over which historical claim and settlement experience is used to estimate and value claims reasonably projected to be made through 2068. Annually, the Company assesses the sufficiency of its estimated liability for pending and future claims and defense costs by evaluating actual experience regarding claims filed, settled and dismissed, and amounts paid in settlements. In addition to claims and settlement experience, the Company considers additional quantitative and qualitative factors such as changes in legislation, the legal environment, and the Company's defense strategy. The Company also evaluates the recoverability of its insurance receivable on an annual basis. The Company evaluates all of these factors and determines whether a change in the estimate of its liability for pending and future claims and defense costs or insurance receivable is warranted. In connection with the recognition of liabilities for asbestos-related matters, the Company records asbestos-related insurance recoveries that are probable. The Company's estimate of asbestos-related insurance recoveries represents estimated amounts due to the Company for previously paid and settled claims and the probable reimbursements relating to its estimated liability for pending and future claims discounted to present value. In determining the amount of insurance recoverable, the Company considers available insurance, allocation methodologies, solvency and creditworthiness of the insurers. Refer to Note 22, "Commitments and Contingencies," of the notes to consolidated financial statements for a discussion on management's judgments applied in the recognition and measurement of asbestos-related assets and liabilities. Incom

Acquisitions and Divestitures (

Acquisitions and Divestitures (Notes)	12 Months Ended
	Sep. 30, 2020
Disclosure Acquisitions And Divestitures [Abstract]
ACQUISITIONS AND DIVESTITURES	ACQUISITIONS AND DIVESTITURES Fiscal Year 2020 During fiscal 2020, the Company completed certain acquisitions for a combined purchase price, net of cash acquired, of $82 million, of which $77 million was paid as of September 30, 2020. In connection with the acquisitions, the Company recorded goodwill of $35 million within the Building Solutions EMEA/LA segment and $21 million within the Global Products segment. The acquisitions were not material to the Company's consolidated financial statements. Additionally, in the fourth quarter of fiscal 2020, the Company acquired additional ownership interest in one of its consolidated subsidiaries within the Global Products segment for a purchase price of $132 million, all of which was paid as of September 30, 2020. In connection with this transaction, the Company recorded a compensation charge of $39 million related to the cash settlement of equity awards. In the fourth quarter of fiscal 2020, the Company completed certain divestitures within the Global Products and Building Solutions Asia Pacific segments. The combined selling price, net of cash divested, was $152 million, of which $135 million was received as of September 30, 2020. In connection with the divestitures, the Company reduced goodwill by $11 million within the Building Solutions Asia Pacific segment. The divestitures were not material to the Company's consolidated financial statements. Fiscal Year 2019 On April 30, 2019, the Company completed the sale of its Power Solutions business to BCP Acquisitions LLC for a purchase price of $13.2 billion. The net cash proceeds after tax and transaction-related expenses were $11.6 billion. In connection with the sale, the Company recorded a gain, net of transaction and other costs, of $5.2 billion ($4.0 billion after tax), subject to post-closing working capital and net debt adjustments, within income from discontinued operations, net of tax, in the consolidated statements of income. Refer to Note 3, "Discontinued Operations," of the notes to consolidated financial statements for further disclosure related to the Company's discontinued operations. During fiscal 2019, the Company completed certain divestitures within the Global Products and Building Solutions EMEA/LA segments. The combined selling price was $18 million, $16 million of which was received as of September 30, 2019. In connection with the sale, the Company reduced goodwill by $1 million within the Building Solutions EMEA/LA segment. The divestitures were not material to the Company's consolidated financial statements. During fiscal 2019, the Company completed certain acquisitions for a combined purchase price of $32 million, $25 million of which was paid as of September 30, 2019. In connection with the acquisitions, the Company recorded goodwill of $11 million within the Global Products segment, $8 million within the Building Solutions Asia Pacific segment, and $6 million within the Building Solutions EMEA/LA segment. The acquisitions were not material to the Company's consolidated financial statements. Fiscal Year 2018 During fiscal 2018, the Company completed certain acquisitions for a combined purchase price, net of cash acquired, of $21 million, all of which was paid as of September 30, 2018. In connection with the acquisitions, the Company recorded goodwill of $14 million within the Global Products segment and $1 million within the Building Solutions EMEA/LA segment. The acquisitions were not material to the Company’s consolidated financial statements. In the first quarter of fiscal 2018, the Company completed the sale of its Scott Safety business to 3M Company. The selling price, net of cash divested, was $2.0 billion, all of which was received as of September 30, 2018. In connection with the sale, the Company recorded a pre-tax gain of $114 million within selling, general and administrative expenses in the consolidated statements of income and reduced goodwill in assets held for sale by $1.2 billion. The gain, net of tax, recorded was $84 million. Also during fiscal 2018, the Company completed certain divestitures primarily within the Global Products segment. The combined selling price was $204 million, all of which was received as of September 30, 2018. In connection with the divestitures, the Company reduced goodwill by $35 million. The divestitures were not material to the Company's consolidated financial statements.

Discontinued Operations (Notes)

Discontinued Operations (Notes)	12 Months Ended
	Sep. 30, 2020
Assets and Liabilities Held for Sale [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS Power Solutions During the first quarter of fiscal 2019, the Company determined that its Power Solutions business met the criteria to be classified as a discontinued operation and, as a result, its historical financial results are reflected in the Company's consolidated financial statements as a discontinued operation, and assets and liabilities were classified as assets and liabilities held for sale. The Company did not allocate any general corporate overhead to discontinued operations. The following table summarizes the results of Power Solutions which are classified as discontinued operations for the fiscal years ended September 30, 2019 and 2018 (in millions). As the Power Solutions sale occurred on April 30, 2019, there are only seven months of results included in the fiscal year ended September 30, 2019. Year Ended September 30, 2019 2018 Net sales $ 5,001 $ 8,000 Income from discontinued operations before income taxes 6,039 1,355 Provision for income taxes on discontinued operations (1,441) (321) Income from discontinued operations attributable to noncontrolling interests, net of tax (24) (47) Income from discontinued operations $ 4,574 $ 987 For the fiscal year ended September 30, 2019, income from discontinued operations before income taxes included a gain on sale of the Power Solutions business, net of transaction and other costs, of $5.2 billion and a favorable impact of $117 million for ceasing depreciation and amortization expense as the business was held for sale. For the fiscal year ended September 30, 2019, the effective tax rate was more than the Irish statutory rate of 12.5% primarily due to the tax impacts of the divestiture of the Power Solutions business and tax rate differentials. For the fiscal year ended September 30, 2018, the effective tax rate was more than the Irish statutory rate of 12.5% primarily due to legal entity restructuring associated with the Power Solutions business and tax rate differentials. Assets and Liabilities Held for Sale During the third quarter of fiscal 2020, the Company determined that certain assets of the Building Solutions Asia Pacific segment met the criteria to be classified as held for sale. The estimated fair value, less costs to sell, of these assets was $147 million at September 30, 2020. During the third quarter of 2019, the Company determined that a business within its Global Products segment met the criteria to be classified as held for sale. This business was sold in the fourth quarter of fiscal 2020. The assets and liabilities of this business are presented as held for sale in the consolidated statements of financial position as of September 30, 2019. Assets and liabilities held for sale are recorded at the lower of carrying value or fair value less any costs to sell. The Company recorded impairment charges within restructuring and impairment costs in the consolidated statements of income of $15 million in the first quarter of fiscal 2020 and $235 million in the third quarter of fiscal 2019 to write down the carrying value of the assets held for sale to fair value less any costs to sell. Refer to Note 17, "Impairment of Long-Lived Assets" of the notes to consolidated financial statements for further information regarding the impairment charges. The business did not meet the criteria to be classified as a discontinued operation as the divestiture did not have a major effect on the Company’s operations and financial results.

Revenue Recognition (Notes)

Revenue Recognition (Notes)	12 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	REVENUE RECOGNITION Disaggregated Revenue The following table presents the Company's revenues disaggregated by segment and by products and systems versus services revenue for the years ended September 30, 2020 and 2019 (in millions): Year Ended September 30, 2020 Year Ended September 30, 2019 Products & Systems Services Total Products & Systems Services Total Building Solutions North America $ 5,371 $ 3,234 $ 8,605 $ 5,745 $ 3,286 $ 9,031 Building Solutions EMEA/LA 1,644 1,796 3,440 1,767 1,888 3,655 Building Solutions Asia Pacific 1,369 1,034 2,403 1,575 1,083 2,658 Global Products 7,869 — 7,869 8,624 — 8,624 Total $ 16,253 $ 6,064 $ 22,317 $ 17,711 $ 6,257 $ 23,968 The following table presents further disaggregation of Global Products segment revenues by product type for the years ended September 30, 2020 and 2019 (in millions): Year Ended Year Ended September 30, 2019 Building management systems $ 1,205 $ 1,292 HVAC & refrigeration equipment 5,613 6,181 Specialty products 1,051 1,151 Total $ 7,869 $ 8,624 Contract Balances Contract assets relate to the Company’s right to consideration for performance obligations satisfied but not billed and consist of unbilled receivables and costs in excess of billings. Contract liabilities relate to customer payments received in advance of satisfaction of performance obligations under the contract. Contract liabilities consist of deferred revenue. Contract balances are classified as assets or liabilities on a contract-by-contract basis at the end of each reporting period. The following table presents the location and amount of contract balances in the Company's consolidated statements of financial position (in millions): Location of contract balances September 30, 2020 September 30, 2019 Contract assets - current Accounts receivable - net $ 1,395 $ 1,389 Contract assets - noncurrent Other noncurrent assets 104 90 Contract liabilities - current Deferred revenue (1,435) (1,407) Contract liabilities - noncurrent Other noncurrent liabilities (245) (228) Total $ (181) $ (156) For the year ended September 30, 2020, the Company recognized revenue of approximately $1.3 billion that was included in the beginning of period contract liability balance. For the year ended September 30, 2019, the Company recognized revenue of approximately $1.2 billion that was included in the beginning of period contract liability balance. Performance Obligations A performance obligation is a distinct good, service, or bundle of goods and services promised in a contract. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. When contracts with customers require significant and complex integration, contain goods or services which are highly interdependent or interrelated, or are goods or services which significantly modify or customize other promises in the contracts and, therefore, are not distinct, then the entire contract is accounted for as a single performance obligation. For any contracts with multiple performance obligations, the contract’s transaction price is allocated to each performance obligation based on the estimated relative standalone selling price of each distinct good or service in the contract. For product sales, each product sold to a customer typically represents a distinct performance obligation. Performance obligations are satisfied as of a point in time or over time. The timing of satisfying the performance obligation is typically indicated by the terms of the contract. As of September 30, 2020, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $14.4 billion, of which approximately 60% is expected to be recognized as revenue over the next two years. The remaining performance obligations expected to be recognized in revenue beyond two years primarily relate to large, multi-purpose contracts to construct hospitals, schools and other governmental buildings, which include services to be performed over the building's lifetime, with initial contract terms of 25 to 35 years. Future contract modifications could affect both the timing and the amount of the remaining performance obligations. The Company excludes the value of remaining performance obligations for contracts with an original expected duration of one year or less. Costs to Obtain or Fulfill a Contract The Company recognizes the incremental costs incurred to obtain or fulfill a contract with a customer as an asset when these costs are recoverable. These costs consist primarily of sales commissions and bid/proposal costs. Costs to obtain or fulfill a contract are capitalized and amortized to revenue over the period of contract performance. As of September 30, 2020, the Company recorded costs to obtain or fulfill a contract of $223 million, of which $119 million is recorded within other current assets and $104 million is recorded within other noncurrent assets in the consolidated statements of financial position. As of September 30, 2019, the Company recorded costs to obtain or fulfill a contract of $212 million, of which $110 million is recorded within other current assets and $102 million is recorded within other noncurrent assets in the consolidated statements of financial position.

Inventories (Notes)

Inventories (Notes)	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories consisted of the following (in millions): September 30, 2020 2019 Raw materials and supplies $ 629 $ 588 Work-in-process 142 176 Finished goods 1,002 1,050 Inventories $ 1,773 $ 1,814

Property, Plant and Equipment (

Property, Plant and Equipment (Notes)	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in millions): September 30, 2020 2019 Buildings and improvements $ 1,351 $ 1,499 Subscriber systems 679 661 Machinery and equipment 3,332 2,969 Construction in progress 327 465 Land 241 250 Total property, plant and equipment 5,930 5,844 Less: accumulated depreciation (2,871) (2,496) Property, plant and equipment - net $ 3,059 $ 3,348 Interest costs capitalized during the fiscal years ended September 30, 2020, 2019 and 2018 were $1 million, $6 million and $17 million, respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Notes)	12 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS The changes in the carrying amount of goodwill in each of the Company’s reportable segments for the fiscal years ended September 30, 2020 and 2019 were as follows (in millions): September 30, 2018 Business Business Impairments Currency Translation September 30, Building Solutions North America $ 9,603 $ — $ — $ — $ (15) $ 9,588 Building Solutions EMEA/LA 1,950 6 (1) — (106) 1,849 Building Solutions Asia Pacific 1,235 8 — — (49) 1,194 Global Products 5,593 11 (22) — (35) 5,547 Total $ 18,381 $ 25 $ (23) $ — $ (205) $ 18,178 September 30, Business Business Impairments Currency Translation September 30, Building Solutions North America $ 9,588 $ — $ — $ (424) $ (4) $ 9,160 Building Solutions EMEA/LA 1,849 35 — — 83 1,967 Building Solutions Asia Pacific 1,194 — (11) — 43 1,226 Global Products 5,547 21 — — 11 5,579 Total $ 18,178 $ 56 $ (11) $ (424) $ 133 $ 17,932 The fiscal 2019 Global Products business divestiture amount includes $22 million of goodwill transferred to noncurrent assets held for sale in the consolidated statements of financial position related to the fiscal 2020 disposal of a business within the Global Products segment. At September 30, 2018, accumulated goodwill impairment charges included $47 million related to the Building Solutions EMEA/LA - Latin America reporting unit. The Company reviews goodwill for impairment during the fourth fiscal quarter or more frequently if events or changes in circumstances indicate the asset might be impaired. The Company considered the ongoing deterioration in general economic and market conditions due to the COVID-19 pandemic and its impact on each of the Company’s reporting units’ performance. Due to further declines in cash flow projections of the North America Retail reporting unit in the third quarter of fiscal 2020 as a result of the COVID-19 pandemic, the Company concluded a triggering event occurred requiring assessment of impairment for its North America Retail reporting unit. As a result, the Company recorded a non-cash impairment charge of $424 million within restructuring and impairment costs in the consolidated statements of income in the third quarter of fiscal 2020, which was determined by comparing the carrying amount of a reporting unit to its fair value in accordance with ASU No. 2017-04, "Intangible - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which the Company early adopted. The North America Retail reporting unit has a remaining goodwill balance of $230 million at September 30, 2020. The Company used a discounted cash flow model to estimate the fair value of the reporting unit. Other than management's internal projections of future cash flows, the primary assumptions used in the model were the weighted-average cost of capital and long-term growth rates, which are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." Although the Company's cash flow forecasts are based on assumptions that are considered reasonable by management and consistent with the plans and estimates management is using to operate the underlying business, there was significant judgment in determining the expected future cash flows attributable to the North America Retail reporting unit. There were no goodwill impairments resulting from the fiscal 2020 and 2019 annual impairment tests. With the exception of the North America Retail reporting unit that had a recent goodwill impairment and is recorded at fair value, no reporting unit was determined to be at risk of failing the goodwill impairment test. The estimated fair value for North America Retail reporting unit exceeded its carrying value by 6%. The Company performs impairment reviews for its reporting units, which have been determined to be the Company’s reportable segments or one level below the reportable segments in certain instances, using a fair value method based on management’s judgments and assumptions or third party valuations. The fair value of a reporting unit refers to the price that would be received to sell the unit as a whole in an orderly transaction between market participants at the measurement date. In estimating the fair value, the Company uses multiples of earnings based on the average of published multiples of earnings of comparable entities with similar operations and economic characteristics and applies the multiples to the Company's average of historical and future financial results for each reporting unit. In certain instances, the Company uses discounted cash flow analyses or estimated sales price to further support the fair value estimates. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." The estimated fair value is then compared with the carrying amount of the reporting unit, including recorded goodwill. The Company is subject to financial statement risk to the extent that the carrying amount exceeds the estimated fair value. The assumptions included in the impairment tests require judgment, and changes to these inputs could impact the results of the calculations. The primary assumptions used in the impairment tests were management's projections of future cash flows. Although the Company's cash flow forecasts are based on assumptions that are considered reasonable by management and consistent with the plans and estimates management is using to operate the underlying businesses, there are significant judgments in determining the expected future cash flows attributable to a reporting unit. The Company continuously monitors for events and circumstances that could negatively impact the key assumptions in determining fair value, including long-term revenue growth projections, profitability, discount rates, recent market valuations from transactions by comparable companies, volatility in the Company's market capitalization, and general industry, market and macro-economic conditions. It is possible that future changes in such circumstances, including a more prolonged and/or severe COVID-19 pandemic, or future changes in the variables associated with the judgments, assumptions and estimates used in assessing the fair value of the reporting unit, would require the Company to record additional non-cash impairment charges. The Company’s other intangible assets, primarily from business acquisitions valued based on independent appraisals, consisted of (in millions): September 30, 2020 September 30, 2019 Gross Accumulated Net Gross Accumulated Net Amortized intangible assets Technology $ 1,332 $ (497) $ 835 $ 1,307 $ (370) $ 937 Customer relationships 2,773 (969) 1,804 2,722 (759) 1,963 Miscellaneous 657 (268) 389 584 (224) 360 Total amortized intangible assets 4,762 (1,734) 3,028 4,613 (1,353) 3,260 Unamortized intangible assets Trademarks/tradenames 2,248 — 2,248 2,282 — 2,282 Miscellaneous 80 — 80 90 — 90 2,328 — 2,328 2,372 — 2,372 Total intangible assets $ 7,090 $ (1,734) $ 5,356 $ 6,985 $ (1,353) $ 5,632 The Company reviews indefinite-lived intangible assets for impairment during the fourth fiscal quarter or more frequently if events or changes in circumstances indicate the asset might be impaired. Indefinite-lived intangible assets primarily consist of trademarks and tradenames and are tested for impairment using a relief-from-royalty method. During the second and third quarters of fiscal 2020, the Company determined that it had a triggering event at each reporting period end requiring assessment of impairment for certain of its indefinite-lived intangible assets due to declines in revenue directly attributable to the COVID-19 pandemic. As a result, the Company recorded an impairment charge of $62 million related primarily to the Company's retail business indefinite-lived intangible assets within restructuring and impairment costs in the consolidated statements of income in the second quarter of fiscal 2020. No further impairment was required to be recorded in the third quarter of fiscal 2020 as a result of the completed impairment assessment. There were no indefinite-lived intangible asset impairments resulting from fiscal 2020 and 2019 annual impairment tests. The estimated fair values of all indefinite-lived intangibles substantially exceeded their carrying values, with the exception of the indefinite-lived trademarks related to the Company's security and Asia Pacific subscriber businesses. The estimated fair value for the security and Asia Pacific indefinite-lived trademarks exceeded their carrying value by 4% and 2%, respectively. The carrying amount of the security and Asia Pacific indefinite-lived trademarks as of September 30, 2020 was $299 million and $37 million, respectively. The Company continuously monitors for events and circumstances that could negatively impact the key assumptions in determining fair value, including long-term revenue growth projections, discount rates and general industry, market and macro-economic conditions. It is possible that future changes in such circumstances, including a more prolonged and/or severe COVID-19 pandemic, or future changes in the variables associated with the judgments, assumptions and estimates used in assessing the fair value of the indefinite-lived intangible assets, would require the Company to record an additional non-cash impairment charge.

Leases (Notes)

Leases (Notes)	12 Months Ended
	Sep. 30, 2020
Leases [Abstract]
LEASES	LEASES Most leases contain options to renew or terminate the lease. Right-of-use assets and lease liabilities reflect only the options which the Company is reasonably certain to exercise. Lease expense is recognized on a straight-line basis over the lease term. The Company has certain real estate leases that contain variable lease payments which are based on changes in the Consumer Price Index (CPI). Additionally, the Company’s leases generally require it to pay for fuel, maintenance, repair, insurance and taxes. These payments are not included in the right-of-use asset or lease liability and are expensed as incurred. The following table presents the Company’s lease costs for the fiscal year ended September 30, 2020 (in millions): Year Ended Operating lease cost $ 399 Variable lease cost 145 Total lease costs $ 544 Total rental expense for continuing operations for the fiscal years ended September 30, 2019 and 2018 was $452 million and $408 million, respectively. The following table presents supplemental consolidated statement of financial position information as of September 30, 2020 (in millions): Location of lease balances September 30, 2020 Operating lease right-of-use assets Other noncurrent assets $ 1,190 Operating lease liabilities - current Other current liabilities 332 Operating lease liabilities - noncurrent Other noncurrent liabilities 875 Weighted-average remaining lease term 6 years Weighted-average discount rate 2.2 % The following table presents supplemental cash flow information related to operating leases for the fiscal year ended September 30, 2020 (in millions): Year Ended Cash paid for amounts included in the measurement of lease liability: Operating cash outflows from operating leases $ 397 Noncash operating lease activity: Right-of-use assets obtained in exchange for operating lease liabilities 467 The following table presents maturities of operating lease liabilities as of September 30, 2020 (in millions): September 30, 2020 2021 $ 352 2022 279 2023 191 2024 143 2025 91 After 2025 235 Total operating lease payments 1,291 Less: interest (84) Present value of lease payments $ 1,207 As previously disclosed in the Company's Annual Report on Form 10-K for the year ended September 30, 2019 and accounted for under the previous lease accounting guidance, future minimum operating lease payments for long-term noncancellable operating leases as of September 30, 2019 were as follows (in millions): September 30, 2019 2020 $ 352 2021 287 2022 200 2023 111 2024 71 After 2024 172 Total minimum lease payments $ 1,193

Debt and Financing Arrangements

Debt and Financing Arrangements (Notes)	12 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
DEBT AND FINANCING ARRANGEMENTS	DEBT AND FINANCING ARRANGEMENTS Short-term debt consisted of the following (in millions): September 30, 2020 2019 Bank borrowings $ 31 $ 10 Weighted average interest rate on short-term debt outstanding 3.4 % 2.0 % The Company had no commercial paper outstanding as of September 30, 2020 and 2019. In December 2019, the Company entered into a syndicated $2.5 billion committed revolving credit facility, which is scheduled to expire in December 2024, and a syndicated $500 million committed revolving credit facility, which is scheduled to expire in December 2020. Additionally, the Company terminated its syndicated 5-year $2 billion committed revolving credit facility and four 364-day revolving credit facilities with total committed capacity of $750 million. As of September 30, 2020, there were no draws on the revolving credit facilities. Long-term debt consisted of the following (in millions; due dates by fiscal year): September 30, 2020 2019 Unsecured notes JCI plc - 5.00% due in 2020 ($453 million par value) $ — $ 453 JCI Inc. - 5.00% due in 2020 ($47 million par value) — 47 JCI plc - 0.00% due in 2021 (€750 million par value) — 818 JCI plc - 4.25% due in 2021 ($204 million par value) 204 204 JCI Inc. - 4.25% due in 2021 ($53 million par value) 53 53 JCI plc - 3.75% due in 2022 ($171 million par value) 171 171 JCI Inc. - 3.75% due in 2022 ($22 million par value) 22 22 JCI plc - 4.625% due in 2023 ($25 million par value) 26 26 Tyco International Finance S.A. ("TIFSA") - 4.625% due in 2023 ($7 million par value) 7 7 JCI plc - 1.00% due in 2023 (€888 million par value) 1,039 967 JCI plc - 3.625% due in 2024 ($453 million par value) 453 453 JCI Inc. - 3.625% due in 2024 ($31 million par value) 31 31 JCI plc - 1.375% due in 2025 (€423 million par value) 503 471 TIFSA - 1.375% due in 2025 (€54 million par value) 64 60 JCI plc - 3.90% due in 2026 ($487 million par value) 516 521 TIFSA - 3.90% due in 2026 ($51 million par value) 51 51 JCI plc and Tyco Fire & Security Finance S.C.A. ("TFSCA") - 0.375% due in 2027 (€500 million par value) 583 — JCI plc and TFSCA - 1.75% due in 2030 ($625 million par value) 623 — JCI plc and TFSCA - 1.00% due in 2032 (€500 million par value) 584 — JCI plc - 6.00% due in 2036 ($342 million par value) 339 339 JCI Inc. - 6.00% due in 2036 ($8 million par value) 8 8 JCI plc - 5.70% due in 2041 ($190 million par value) 189 189 JCI Inc. - 5.70% due in 2041 ($30 million par value) 30 30 JCI plc - 5.25% due in 2042 ($155 million par value) 155 155 JCI Inc. - 5.25% due in 2042 ($6 million par value) 6 6 JCI plc - 4.625% due in 2044 ($444 million par value) 441 441 JCI Inc. - 4.625% due in 2044 ($6 million par value) 6 6 JCI plc - 5.125% due in 2045 ($477 million par value) 564 567 TIFSA - 5.125% due in 2045 ($23 million par value) 22 22 JCI plc - 6.95% due in 2046 ($32 million par value) 32 32 JCI Inc. - 6.95% due in 2046 ($4 million par value) 4 4 JCI plc - 4.50% due in 2047 ($500 million par value) 496 496 JCI plc - 4.95% due in 2064 ($341 million par value) 340 340 JCI Inc. - 4.95% due in 2064 ($15 million par value) 15 15 JCI plc - Term Loan - ¥25 billion; LIBOR JPY plus 0.40% due in 2022 237 232 Other 8 3 Gross long-term debt 7,822 7,240 Less: current portion 262 501 Less: debt issuance costs 34 31 Net long-term debt $ 7,526 $ 6,708 The installments of long-term debt maturing in subsequent fiscal years are: 2021 - $262 million; 2022 - $432 million; 2023 - $1,073 million; 2024 - $484 million; 2025 - $567 million; 2026 and thereafter - $5,004 million. The Company’s long-term debt includes various financial covenants, none of which are expected to restrict future operations. Total interest paid on both short and long-term debt for continuing operations for the fiscal years ended September 30, 2020, 2019 and 2018 was $247 million, $369 million and $401 million, respectively. Financing Arrangements In September 2020, the Company and its wholly owned subsidiary, TFSCA issued €500 million aggregate principal amount of their 0.375% Senior Notes due 2027 and €500 million aggregate principal amount of their 1.000% Senior Notes due 2032. A portion of the proceeds were used to repay €750 million of notes which were due in December 2020 and the short-term debt which was issued in April 2020, including $675 million of European financing arrangements which were due in September 2020 and $275 million of bank term loans which were due in April 2021. The remainder of the proceeds is to be used for general corporate purposes. In July 2020, the Company repaid $300 million of a bank term loan that was issued in April 2020. In September 2020, the Company and its wholly owned subsidiary, TFSCA issued $625 million of green bonds with an interest rate of 1.750% which are due in 2030. The net proceeds are being used to support projects that focus on sustainability and support the Company's 2025 sustainability goals. In March 2020, the Company retired $500 million in principal amount, plus accrued interest, of its 5.0% fixed rate notes that expired in March 2020. Net Financing Charges The Company's net financing charges line item in the consolidated statements of income for the years ended September 30, 2020, 2019 and 2018 contained the following components (in millions): Year Ended September 30, 2020 2019 2018 Interest expense, net of capitalized interest costs $ 240 $ 335 $ 409 Banking fees and bond cost amortization 26 28 30 Loss on debt extinguishment — 60 — Interest income (23) (61) (13) Net foreign exchange results for financing activities (12) (12) (25) Net financing charges $ 231 $ 350 $ 401

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	12 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The Company selectively uses derivative instruments to reduce market risk associated with changes in foreign currency, commodities, stock-based compensation liabilities and interest rates. Under Company policy, the use of derivatives is restricted to those intended for hedging purposes; the use of any derivative instrument for speculative purposes is strictly prohibited. A description of each type of derivative utilized by the Company to manage risk is included in the following paragraphs. In addition, refer to Note 11, "Fair Value Measurements," of the notes to consolidated financial statements for information related to the fair value measurements and valuation methods utilized by the Company for each derivative type. Cash Flow Hedges The Company has global operations and participates in foreign exchange markets to minimize its risk of loss from fluctuations in foreign currency exchange rates. The Company selectively hedges anticipated transactions that are subject to foreign exchange rate risk primarily using foreign currency exchange hedge contracts. The Company hedges 70% to 90% of the notional amount of each of its known foreign exchange transactional exposures. The Company selectively hedges anticipated transactions that are subject to commodity price risk, primarily using commodity hedge contracts, to minimize overall price risk associated with the Company’s purchases of copper and aluminum in cases where commodity price risk cannot be naturally offset or hedged through supply base fixed price contracts. Commodity risks are systematically managed pursuant to policy guidelines. The maturities of the commodity hedge contracts coincide with the expected purchase of the commodities. As cash flow hedges under ASC 815, "Derivatives and Hedging," the hedge gains or losses due to changes in fair value are initially recorded as a component of AOCI and are subsequently reclassified into earnings when the hedged transactions occur and affect earnings. These contracts were highly effective in hedging the variability in future cash flows attributable to changes in currency exchange rates during the fiscal years ended September 30, 2020 and 2019. The Company had the following outstanding contracts to hedge forecasted commodity purchases (in metric tons): Volume Outstanding as of Commodity September 30, 2020 September 30, 2019 Copper 2,497 3,561 Aluminum 3,036 2,967 Net Investment Hedges The Company enters into foreign currency denominated debt obligations to selectively hedge portions of its net investment in non-U.S. subsidiaries. The currency effects of the debt obligations are reflected in the AOCI account within shareholders’ equity attributable to Johnson Controls ordinary shareholders where they offset currency gains and losses recorded on the Company’s net investments globally. At September 30, 2020, the Company had 888 million euro, 500 million euro, 500 million euro, 423 million euro and 54 million euro in bonds designated as net investment hedges in the Company's net investment in Europe and 25 billion yen of foreign denominated debt designated as net investment hedge in the Company's net investment in Japan. At September 30, 2019, the Company had 888 million euro, 750 million euro, 423 million euro and 54 million euro in bonds designated as net investment hedges in the Company's net investment in Europe and 25 billion yen of foreign denominated debt designated as net investment hedge in the Company's net investment in Japan. Derivatives Not Designated as Hedging Instruments The Company selectively uses equity swaps to reduce market risk associated with certain of its stock-based compensation plans, such as its deferred compensation plans. These equity compensation liabilities increase as the Company’s stock price increases and decrease as the Company’s stock price decreases. In contrast, the value of the swap agreement moves in the opposite direction of these liabilities, allowing the Company to fix a portion of the liabilities at a stated amount. As of September 30, 2020 and 2019, the Company hedged approximately 1.4 million of its ordinary shares, which have a cost basis of $60 million. The Company also holds certain foreign currency forward contracts for which hedge accounting treatment was not elected. The change in fair value of foreign currency exchange derivatives not designated as hedging instruments under ASC 815 are recorded in the consolidated statements of income. Fair Value of Derivative Instruments The following table presents the location and fair values of derivative instruments and hedging activities included in the Company’s consolidated statements of financial position (in millions): Derivatives and Hedging Activities Derivatives and Hedging Activities Not September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Other current assets Foreign currency exchange derivatives $ 10 $ 16 $ 17 $ 19 Commodity derivatives 2 — — — Other noncurrent assets Equity swap — — 58 62 Total assets $ 12 $ 16 $ 75 $ 81 Other current liabilities Foreign currency exchange derivatives $ 10 $ 23 $ — $ — Commodity derivatives — 1 — — Long-term debt Foreign currency denominated debt 3,010 2,544 — — Total liabilities $ 3,020 $ 2,568 $ — $ — Counterparty Credit Risk The use of derivative financial instruments exposes the Company to counterparty credit risk. The Company has established policies and procedures to limit the potential for counterparty credit risk, including establishing limits for credit exposure and continually assessing the creditworthiness of counterparties. As a matter of practice, the Company deals with major banks worldwide having strong investment grade long-term credit ratings. To further reduce the risk of loss, the Company generally enters into International Swaps and Derivatives Association ("ISDA") master netting agreements with substantially all of its counterparties. The Company enters into ISDA master netting agreements with counterparties that permit the net settlement of amounts owed under the derivative contracts. The master netting agreements generally provide for net settlement of all outstanding contracts with a counterparty in the case of an event of default or a termination event. The Company has not elected to offset the fair value positions of the derivative contracts recorded in the consolidated statements of financial position. The Company's derivative contracts do not contain any credit risk related contingent features and do not require collateral or other security to be furnished by the Company or the counterparties. The Company's exposure to credit risk associated with its derivative instruments is measured on an individual counterparty basis, as well as by groups of counterparties that share similar attributes. The Company does not anticipate any non-performance by any of its counterparties, and the concentration of risk with financial institutions does not present significant credit risk to the Company. The gross and net amounts of derivative assets and liabilities were as follows (in millions): Fair Value of Assets Fair Value of Liabilities September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Gross amount recognized $ 87 $ 97 $ 3,020 $ 2,568 Gross amount eligible for offsetting (10) (11) (10) (11) Net amount $ 77 $ 86 $ 3,010 $ 2,557 Derivatives Impact on the Statements of Income and Statements of Comprehensive Income The following table presents the pre-tax gains (losses) recorded in other comprehensive income (loss) related to cash flow hedges for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives in ASC 815 Cash Flow Hedging Relationships Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives $ 1 $ 2 $ 2 Commodity derivatives 6 (4) (14) Total $ 7 $ (2) $ (12) The following table presents the location and amount of the pre-tax gains (losses) on cash flow hedges reclassified from AOCI into the Company’s consolidated statements of income for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives in ASC 815 Cash Flow Location of Gain (Loss) Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives Cost of sales $ (5) $ 4 $ 2 Foreign currency exchange derivatives Income from discontinued operations — — 2 Commodity derivatives Cost of sales 2 (4) 5 Commodity derivatives Income from discontinued operations — (10) 7 Total $ (3) $ (10) $ 16 The following table presents the location and amount of pre-tax gains (losses) on derivatives not designated as hedging instruments recognized in the Company’s consolidated statements of income for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives Not Designated as Hedging Instruments under ASC 815 Location of Gain (Loss) Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives Cost of sales $ (1) $ (8) $ 4 Foreign currency exchange derivatives Net financing charges 87 (60) 42 Foreign currency exchange derivatives Income tax provision — (1) (4) Foreign currency exchange derivatives Income from discontinued operations — 52 (7) Equity swap Selling, general and administrative (4) 14 (8) Total $ 82 $ (3) $ 27 The pre-tax gains (losses) recorded in foreign currency translation adjustment ("CTA") within other comprehensive income (loss) related to net investment hedges were $(172) million, $145 million and $45 million for the years ended September 30, 2020, 2019 and 2018, respectively. For the years ended September 30, 2020, 2019 and 2018, no gains or losses were reclassified from CTA into income for the Company’s outstanding net investment hedges.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	12 Months Ended
	Sep. 30, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS ASC 820, "Fair Value Measurement," defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also establishes a three-level fair value hierarchy that prioritizes information used in developing assumptions when pricing an asset or liability as follows: Level 1: Observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2: Quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and Level 3: Unobservable inputs where there is little or no market data, which requires the reporting entity to develop its own assumptions. ASC 820 requires the use of observable market data, when available, in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Recurring Fair Value Measurements The following tables present the Company’s fair value hierarchy for those assets and liabilities measured at fair value as of September 30, 2020 and 2019 (in millions): Fair Value Measurements Using: Total as of September 30, 2020 Quoted Prices Significant Significant Other current assets Foreign currency exchange derivatives $ 27 $ — $ 27 $ — Exchange traded funds (fixed income) 1 19 19 — — Commodity derivatives 2 — 2 — Other noncurrent assets Deferred compensation plan assets 63 63 — — Exchange traded funds (fixed income) 1 143 143 — — Exchange traded funds (equity) 1 129 129 — — Equity swap 58 — 58 — Total assets $ 441 $ 354 $ 87 $ — Other current liabilities Foreign currency exchange derivatives $ 10 $ — $ 10 $ — Total liabilities $ 10 $ — $ 10 $ — Fair Value Measurements Using: Total as of September 30, 2019 Quoted Prices Significant Significant Other current assets Foreign currency exchange derivatives $ 35 $ — $ 35 $ — Exchange traded funds (fixed income) 1 19 19 — — Other noncurrent assets Deferred compensation plan assets 71 71 — — Exchange traded funds (fixed income) 1 138 138 — — Exchange traded funds (equity) 1 116 116 — — Equity swap 62 — 62 — Total assets $ 441 $ 344 $ 97 $ — Other current liabilities Foreign currency exchange derivatives $ 23 $ — $ 23 $ — Commodity derivatives 1 — 1 — Total liabilities $ 24 $ — $ 24 $ — 1 Classified as restricted investments for payment of asbestos liabilities. See Note 22, "Commitments and Contingencies" of the notes to consolidated financial statements for further details. Valuation Methods Foreign currency exchange derivatives : The foreign currency exchange derivatives are valued under a market approach using publicized spot and forward prices. Commodity derivatives : The commodity derivatives are valued under a market approach using publicized prices, where available, or dealer quotes. Equity swaps : The equity swaps are valued under a market approach as the fair value of the swaps is equal to the Company’s stock price at the reporting period date. Deferred compensation plan assets : Assets held in the deferred compensation plans will be used to pay benefits under certain of the Company's non-qualified deferred compensation plans. The investments primarily consist of mutual funds which are publicly traded on stock exchanges and are valued using a market approach based on the quoted market prices. Unrealized gains (losses) on the deferred compensation plan assets are recognized in the consolidated statements of income where they offset unrealized gains and losses on the related deferred compensation plan liability. Investments in exchange traded funds : Investments in exchange traded funds are valued using a market approach based on the quoted market prices, where available, or broker/dealer quotes of identical or comparable instruments. Refer to Note 22, "Commitments and Contingencies," of the notes to consolidated financial statements for further information. The following table presents the portion of unrealized gains (losses) recognized in the consolidated statements of income for the years ended September 30, 2020 and 2019 that relate to equity securities still held at September 30, 2020 and 2019 (in millions): Year Ended 2020 2019 Deferred compensation plan assets $ 1 $ (2) Investments in exchange traded funds 21 12 All of the gains and losses on investments in exchange traded funds related to restricted investments.

Stock-based Compensation (Notes

Stock-based Compensation (Notes)	12 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION The Johnson Controls International plc 2012 Share and Incentive Plan (the "Plan"), as amended in September 2016, authorizes stock options, stock appreciation rights, restricted (non-vested) stock/units, performance shares, performance units and other stock-based awards. The Compensation Committee of the Company's Board of Directors determines the types of awards to be granted to individual participants and the terms and conditions of the awards. As of September 30, 2020, there were 76 million shares of the Company's common stock reserved and 27 million shares available for issuance under the Plan. The Company has four share-based compensation plans, which are described below. For the fiscal years ended September 30, 2020, 2019 and 2018, compensation cost charged against income for continuing operations, excluding the offsetting impact of outstanding equity swaps, for those plans was approximately $66 million, $103 million and $89 million, respectively, all of which was recorded in selling, general and administrative expenses. The total income tax benefit recognized for continuing operations in the consolidated statements of income for share-based compensation arrangements was approximately $16 million, $26 million and $22 million for the fiscal years ended September 30, 2020, 2019 and 2018, respectively. The tax impact from the exercise and vesting of equity settled awards was less than $1 million of tax benefit, $6 million of tax expense and $3 million of tax expense for the fiscal years ended September 30, 2020, 2019 and 2018, respectively. The Company does not settle stock options granted under share-based payment arrangements to cash. Stock Options Stock options are granted with an exercise price equal to the market price of the Company’s stock at the date of grant. Stock option awards typically vest between two and three years after the grant date and expire ten years from the grant date. The fair value of each option is estimated on the date of grant using a Black-Scholes option valuation model that uses the assumptions noted in the following table. The expected life of options represents the period of time that options granted are expected to be outstanding, assessed separately for executives and non-executives. The risk-free interest rate for periods during the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatility is based on the historical volatility of the Company's stock since October 2016 blended with the historical volatility of certain peer companies' stock prior to October 2016 over the most recent period corresponding to the expected life as of the grant date. The expected dividend yield is based on the expected annual dividend as a percentage of the market value of the Company’s ordinary shares as of the grant date. The Company uses historical data to estimate option exercises and employee terminations within the valuation model. Year Ended September 30, 2020 2019 2018 Expected life of option (years) 6.5 6.4 6.5 Risk-free interest rate 1.67% 2.77% 2.28% Expected volatility of the Company’s stock 22.40% 21.80% 23.70% Expected dividend yield on the Company’s stock 2.49% 3.29% 2.78% A summary of stock option activity at September 30, 2020, and changes for the year then ended, is presented below: Weighted Shares Weighted Aggregate Outstanding, September 30, 2019 $ 35.07 12,369,749 Granted 41.67 1,347,310 Exercised 28.80 (2,504,516) Forfeited or expired 38.30 (1,097,638) Outstanding, September 30, 2020 $ 37.14 10,114,905 4.9 $ 46 Exercisable, September 30, 2020 $ 36.98 7,473,203 3.6 $ 36 The weighted-average grant-date fair value of options granted during the fiscal years ended September 30, 2020, 2019 and 2018 was $7.29, $5.56 and $7.04, respectively. The total intrinsic value of options exercised during the fiscal years ended September 30, 2020, 2019 and 2018 was approximately $30 million, $73 million and $38 million, respectively. In conjunction with the exercise of stock options, the Company received cash payments for the fiscal years ended September 30, 2020, 2019 and 2018 of approximately $75 million, $171 million and $66 million, respectively. At September 30, 2020, the Company had approximately $9 million of total unrecognized compensation cost related to non-vested stock options granted for continuing operations which is expected to be recognized over a weighted-average period of 1.8 years. Stock Appreciation Rights ("SARs") SARs vest under the same terms and conditions as stock option awards; however, they are settled in cash for the difference between the market price on the date of exercise and the exercise price. As a result, SARs are recorded in the Company’s consolidated statements of financial position as a liability until the date of exercise. The fair value of each SAR award is estimated using a similar method described for stock options. The fair value of each SAR award is recalculated at the end of each reporting period and the liability and expense are adjusted based on the new fair value. The assumptions used to determine the fair value of the SAR awards at September 30, 2020 were as follows: Expected life of SAR (years) 0.4 - 2.5 Risk-free interest rate 0.11% - 0.18% Expected volatility of the Company’s stock 22.40% Expected dividend yield on the Company’s stock 2.49% A summary of SAR activity at September 30, 2020, and changes for the year then ended, is presented below: Weighted Shares Weighted Aggregate Outstanding, September 30, 2019 $ 28.67 368,009 Exercised 26.88 (129,277) Forfeited or expired 25.47 (26,095) Outstanding, September 30, 2020 $ 30.14 212,637 1.8 $ 2 Exercisable, September 30, 2020 $ 30.14 212,637 1.8 $ 2 In conjunction with the exercise of SARs granted, the Company made payments of $2 million, $3 million and $3 million during the fiscal years ended September 30, 2020, 2019 and 2018, respectively. Restricted (Non-vested) Stock / Units Restricted stock or restricted stock units are typically share settled unless the employee is a non-U.S. employee or elects to defer settlement until retirement at which point the award would be settled in cash. Restricted awards typically vest over a period of three years from the grant date. The Plan allows for different vesting terms on specific grants with approval by the Board of Directors. The fair value of each share-settled restricted award is based on the closing market value of the Company’s ordinary shares on the date of grant. The fair value of each cash-settled restricted award is recalculated at the end of each reporting period based on the closing market value of the Company's ordinary shares at the end of the reporting period, and the liability and expense are adjusted based on the new fair value. A summary of non-vested restricted stock awards at September 30, 2020, and changes for the fiscal year then ended, is presented below: Weighted Shares/Units Non-vested, September 30, 2019 $ 35.98 3,333,076 Granted 41.38 2,053,292 Vested 37.39 (1,634,306) Forfeited 37.47 (522,183) Non-vested, September 30, 2020 $ 38.58 3,229,879 At September 30, 2020, the Company had approximately $81 million of total unrecognized compensation cost related to non-vested restricted stock arrangements granted for continuing operations which is expected to be recognized over a weighted-average period of 2.1 years. Performance Share Awards Performance-based share unit ("PSU") awards are generally contingent on the achievement of predetermined performance goals over a performance period of three years as well as on the award holder's continuous employment until the vesting date. The PSUs are also indexed to the achievement of specified levels of total shareholder return versus a peer group over the performance period. Each PSU that is earned is settled with shares of the Company's ordinary shares following the completion of the performance period, unless the award holder elected to defer a portion or all of the award until retirement which would then be settled in cash. The fair value of each PSU is estimated on the date of grant using a Monte Carlo simulation that uses the assumptions noted in the following table. The risk-free interest rate for periods during the contractual life of the PSU is based on the U.S. Treasury yield curve in effect at the time of grant. For fiscal 2020, the expected volatility is based on the historical volatility of the Company's stock over the most recent three-year period as of the grant date. For fiscal 2019 and 2018, the expected volatility is based on the historical volatility of the Company's stock since October 2016 blended with the historical volatility of certain peer companies' stock prior to October 2016 over the most recent three-year period as of the grant date. Year Ended September 30, 2020 2019 2018 Risk-free interest rate 1.60% 2.76% 1.92% Expected volatility of the Company’s stock 21.80% 22.90% 21.70% A summary of the status of the Company’s non-vested PSUs at September 30, 2020, and changes for the fiscal year then ended, is presented below: Weighted Shares/Units Non-vested, September 30, 2019 $ 39.82 1,825,519 Granted 42.48 476,939 Vested 44.98 (515,975) Forfeited 38.87 (168,539) Non-vested, September 30, 2020 $ 39.06 1,617,944 At September 30, 2020, the Company had approximately $25 million of total unrecognized compensation cost related to non-vested performance-based share unit awards granted for continuing operations which is expected to be recognized over a weighted-average period of 1.8 years.

Earnings Per Share (Notes)

Earnings Per Share (Notes)	12 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHAREThe Company presents both basic and diluted EPS amounts. Basic EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares outstanding during the reporting period. Diluted EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares and ordinary equivalent shares outstanding during the reporting period that are calculated using the treasury stock method for stock options, unvested restricted stock and unvested performance share awards. The treasury stock method assumes that the Company uses the proceeds from the exercise of stock option awards to repurchase ordinary shares at the average market price during the period. The assumed proceeds under the treasury stock method include the purchase price that the grantee will pay in the future and compensation cost for future service that the Company has not yet recognized. For unvested restricted stock and unvested performance share awards, assumed proceeds under the treasury stock method include unamortized compensation cost. The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions): Year Ended September 30, 2020 2019 2018 Income Available to Ordinary Shareholders Income from continuing operations $ 631 $ 1,100 $ 1,175 Income from discontinued operations — 4,574 987 Basic and diluted income available to shareholders $ 631 $ 5,674 $ 2,162 Weighted Average Shares Outstanding Basic weighted average shares outstanding 751.0 870.2 925.7 Effect of dilutive securities: Stock options, unvested restricted stock and unvested 2.6 4.1 6.0 Diluted weighted average shares outstanding 753.6 874.3 931.7 Antidilutive Securities Options to purchase shares 1.4 1.4 1.5

Equity and Noncontrolling Inter

Equity and Noncontrolling Interests (Notes)	12 Months Ended
	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
EQUITY AND NONCONTROLLING INTERESTS	EQUITY AND NONCONTROLLING INTERESTS Dividends The authority to declare and pay dividends is vested in the Board of Directors. The timing, declaration and payment of future dividends to holders of the Company's ordinary shares is determined by the Company's Board of Directors and depends upon many factors, including the Company's financial condition and results of operations, the capital requirements of the Company's businesses, industry practice and any other relevant factors. Under Irish law, dividends may only be paid (and share repurchases and redemptions must generally be funded) out of "distributable reserves." The creation of distributable reserves was accomplished by way of a capital reduction, which the Irish High Court approved on December 18, 2014 and as acquired in conjunction with the Merger. Share Repurchase Program In March 2019, the Company's Board of Directors approved an $8.5 billion increase to its existing share repurchase authorization, subject to the completion of the previously announced sale of the Company's Power Solutions business, which closed on April 30, 2019. 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. As of September 30, 2020, approximately $2.4 billion remains available under the share repurchase program. During fiscal year 2020, the Company repurchased and retired approximately $2,204 million of its ordinary shares. During fiscal year 2019, the Company repurchased approximately $5,983 million of its ordinary shares, of which $4,035 million of its ordinary shares were purchased through a publicly announced "modified Dutch auction" tender offer and immediately retired, and $1,948 million of its ordinary shares were purchased on an open market and retired in the fourth quarter of fiscal 2019. During fiscal year 2018, the Company repurchased approximately $300 million of its ordinary shares. Other comprehensive income includes activity relating to discontinued operations. The following schedules present changes in consolidated equity attributable to Johnson Controls and noncontrolling interests (in millions, net of tax): Equity Attributable to Johnson Controls Equity Attributable to Noncontrolling Interests Total Equity At September 30, 2017 $ 20,447 $ 920 $ 21,367 Total comprehensive income (loss): Net income 2,162 186 2,348 Foreign currency translation adjustments (458) (22) (480) Realized and unrealized losses on derivatives (19) (1) (20) Realized and unrealized gains on marketable securities 4 — 4 Other comprehensive loss (473) (23) (496) Comprehensive income 1,689 163 1,852 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (968) — (968) Dividends attributable to noncontrolling interests — (43) (43) Repurchases of ordinary shares (300) — (300) Change in noncontrolling interest share — 23 23 Adoption of ASU 2016-09 179 — 179 Reclassification from redeemable noncontrolling interest — 231 231 Other, including options exercised 117 — 117 At September 30, 2018 21,164 1,294 22,458 Total comprehensive income (loss): Net income 5,674 213 5,887 Foreign currency translation adjustments (325) (17) (342) Realized and unrealized gains (losses) on derivatives 7 (1) 6 Pension and postretirement plans (6) — (6) Other comprehensive loss (324) (18) (342) Comprehensive income 5,350 195 5,545 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (887) — (887) Dividends attributable to noncontrolling interests — (132) (132) Repurchases and retirements of ordinary shares (5,983) — (5,983) Divestiture of Power Solutions 483 (295) 188 Adoption of ASC 606 (45) — (45) Adoption of ASU 2016-16 (546) — (546) Other, including options exercised 230 1 231 At September 30, 2019 19,766 1,063 20,829 Total comprehensive income: Net income 631 164 795 Foreign currency translation adjustments 7 18 25 Realized and unrealized gains on derivatives 4 4 8 Pension and postretirement plans 8 — 8 Other comprehensive income 19 22 41 Comprehensive income 650 186 836 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (780) — (780) Dividends attributable to noncontrolling interests — (114) (114) Repurchases and retirements of ordinary shares (2,204) — (2,204) Change in noncontrolling interest share (83) (49) (132) Adoption of ASC 842 (5) — (5) Other, including options exercised 103 — 103 At September 30, 2020 $ 17,447 $ 1,086 $ 18,533 The Company adopted ASC 606, "Revenue from Contracts with Customers" effective October 1, 2018. As a result, the Company recorded $45 million to beginning retained earnings, which relates primarily to deferred revenue recorded for the Power Solutions business for certain battery core returns that represent a material right provided to customers. The Company adopted ASU 2016-16, "Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other Than Inventory" effective October 1, 2018. As a result, the Company recognized deferred taxes of $546 million related to the tax effects of all intra-entity sales of assets other than inventory on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of October 1, 2018. The Company adopted ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" effective October 1, 2017. As a result, the Company recognized deferred tax assets of $179 million related to certain operating loss carryforwards resulting from the exercise of employee stock options and restricted stock vesting on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of October 1, 2017. The Company consolidates certain subsidiaries in which the noncontrolling interest party has within their control the right to require the Company to redeem all or a portion of its interest in the subsidiary. The redeemable noncontrolling interests are reported at their estimated redemption value. Any adjustment to the redemption value impacts retained earnings but does not impact net income. Redeemable noncontrolling interests which are redeemable only upon future events, the occurrence of which is not currently probable, are recorded at carrying value. As of September 30, 2020 and 2019, the Company does not have any subsidiaries for which the noncontrolling interest party has within their control the right to require the Company to redeem any portion of its interests. The following schedules present changes in the redeemable noncontrolling interests (in millions): Year Ended September 30, 2018 Beginning balance, September 30 $ 211 Net income 35 Foreign currency translation adjustments (3) Realized and unrealized losses on derivatives (9) Dividends (3) Reclassification to noncontrolling interest (231) Ending balance, September 30 $ — The following schedules present changes in AOCI attributable to Johnson Controls (in millions, net of tax): Year Ended September 30, 2020 2019 2018 Foreign currency translation adjustments Balance at beginning of period $ (785) $ (939) $ (481) Divestiture of Power Solutions — 479 — Aggregate adjustment for the period (net of tax effect of $1, $0 and $(3)) (1) 7 (325) (458) Balance at end of period (778) (785) (939) Realized and unrealized gains (losses) on derivatives Balance at beginning of period (2) (13) 6 Divestiture of Power Solutions (net of tax effect of $0, $1 and $0) — 4 — Current period changes in fair value (net of tax effect of $1, $(1) and $(4)) 3 (1) (8) Reclassification to income (net of tax effect of $0, $2 and $(5)) (2) 1 8 (11) Balance at end of period 2 (2) (13) Realized and unrealized gains (losses) on marketable securities Balance at beginning of period — 8 4 Adoption of ASU 2016-01 (3) — (8) — Current period changes in fair value (net of tax effect of $0, $0 and $1) — — 5 Reclassification to income (net of tax effect of $0, $0 and $(1)) (4) — — (1) Balance at end of period — — 8 Pension and postretirement plans Balance at beginning of period (8) (2) (2) Reclassification to income (net of tax effect of $(1), $0 and $0) (1) — — Other changes (net of tax effect of $4, $0 and $0) 9 (6) — Balance at end of period — (8) (2) Accumulated other comprehensive loss, end of period $ (776) $ (795) $ (946) (1) During fiscal 2018, $12 million of cumulative CTA was recognized as part of the divestiture-related gain recognized as part of the divestiture of Scott Safety. (2) Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to 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. (3) The Company adopted ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" effective October 1, 2018 and, as a result, reclassified $8 million of unrealized gains on marketable securities to retained earnings. (4) During fiscal 2018, the Company sold certain marketable common stock for approximately $3 million. As a result, the Company recorded $2 million of realized gains within selling, general and administrative expenses.

Retirement Plans (Notes)

Retirement Plans (Notes)	12 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
RETIREMENT PLANS	RETIREMENT PLANS Pension Benefits The Company has non-contributory defined benefit pension plans covering certain U.S. and non-U.S. employees. The benefits provided are primarily based on years of service and average compensation or a monthly retirement benefit amount. Certain of the Company’s U.S. pension plans have been amended to prohibit new participants from entering the plans and no longer accrue benefits. Funding for U.S. pension plans equals or exceeds the minimum requirements of the Employee Retirement Income Security Act of 1974. Funding for non-U.S. plans observes the local legal and regulatory limits. Also, the Company makes contributions to union-trusteed pension funds for construction and service personnel. For pension plans with accumulated benefit obligations ("ABO") that exceed plan assets for continuing and discontinued operations, the projected benefit obligation ("PBO"), ABO and fair value of plan assets of those plans were $5,598 million, $5,539 million and $4,528 million, respectively, as of September 30, 2020 and $5,450 million, $5,388 million and $4,484 million, respectively, as of September 30, 2019. In fiscal 2020, total employer contributions to the defined benefit pension plans were $58 million, none of which were voluntary contributions made by the Company. The Company expects to contribute approximately $46 million in cash to its defined benefit pension plans in fiscal 2021. Projected benefit payments from the plans as of September 30, 2020 are estimated as follows (in millions): 2021 $ 323 2022 301 2023 307 2024 309 2025 309 2026 - 2030 1,516 Postretirement Benefits The Company provides certain health care and life insurance benefits for eligible retirees and their dependents primarily in the U.S. and Canada. Most non-U.S. employees are covered by government sponsored programs, and the cost to the Company is not significant. Eligibility for coverage is based on meeting certain years of service and retirement age qualifications. These benefits may be subject to deductibles, co-payment provisions and other limitations, and the Company has reserved the right to modify these benefits. The health care cost trend assumption does not have a significant effect on the amounts reported. In fiscal 2020, total employer contributions to the postretirement plans were $3 million. The Company expects to contribute approximately $3 million in cash to its postretirement plans in fiscal 2021 for continuing operations. Projected benefit payments from the plans as of September 30, 2020 are estimated as follows (in millions): 2021 $ 13 2022 12 2023 12 2024 12 2025 11 2026 - 2030 45 The Medicare Prescription Drug, Improvement and Modernization Act of 2003 ("Act") includes a prescription drug benefit under Medicare as well as a federal subsidy to sponsors of retiree health care benefit plans providing a benefit that is at least actuarially equivalent to Medicare Part D.1. Under the Act, the Medicare subsidy amount is received directly by the plan sponsor and not the related plan. Further, the plan sponsor is not required to use the subsidy amount to fund postretirement benefits and may use the subsidy for any valid business purpose. Projected subsidy receipts are estimated to be less than $1 million per year over the next ten years. Defined Contribution Plans The Company sponsors various defined contribution savings plans that allow employees to contribute a portion of their pre-tax and/or after-tax income in accordance with plan specified guidelines. Under specified conditions, the Company will contribute to certain savings plans based on predetermined percentages of compensation earned by the employee and/or will match a percentage of the employee contributions up to certain limits. The Company temporarily suspended contributions in fiscal 2020 in response to the COVID-19 pandemic. Defined contribution plan contributions charged to expense for continuing and discontinued operations amounted to $104 million, $198 million and $205 million for the fiscal years ended 2020, 2019 and 2018, respectively. Multiemployer Benefit Plans The Company contributes to multiemployer benefit plans based on obligations arising from collective bargaining agreements related to certain of its hourly employees in the U.S. These plans provide retirement benefits to participants based on their service to contributing employers. The benefits are paid from assets held in trust for that purpose. The trustees typically are responsible for determining the level of benefits to be provided to participants as well as for such matters as the investment of the assets and the administration of the plans. The risks of participating in these multiemployer benefit plans are different from single-employer benefit plans in the following aspects: • Assets contributed to the multiemployer benefit plan by one employer may be used to provide benefits to employees of other participating employers. • If a participating employer stops contributing to the multiemployer benefit plan, the unfunded obligations of the plan may be borne by the remaining participating employers. • If the Company stops participating in some of its multiemployer benefit plans, the Company may be required to pay those plans an amount based on its allocable share of the underfunded status of the plan, referred to as a withdrawal liability. The Company participates in approximately 280 multiemployer benefit plans, none of which are individually significant to the Company. The number of employees covered by the Company’s multiemployer benefit plans has remained consistent over the past three years, and there have been no significant changes that affect the comparability of fiscal 2020, 2019 and 2018 contributions. The Company recognizes expense for the contractually-required contribution for each period. The Company contributed $66 million, $69 million and $68 million to multiemployer benefit plans in fiscal 2020, 2019 and 2018, respectively. Based on the most recent information available, the Company believes that the present value of actuarial accrued liabilities in certain of these multiemployer benefit plans may exceed the value of the assets held in trust to pay benefits. Currently, the Company is not aware of any significant multiemployer benefits plans for which it is probable or reasonably possible that the Company will be obligated to make up any shortfall in funds. Moreover, if the Company were to exit certain markets or otherwise cease making contributions to these funds, the Company could trigger a withdrawal liability. Currently, the Company is not aware of any multiemployer benefit plans for which it is probable or reasonably possible that the Company will have a significant withdrawal liability. Any accrual for a shortfall or withdrawal liability will be recorded when it is probable that a liability exists and it can be reasonably estimated. Plan Assets The Company’s investment policies employ an approach whereby a mix of equities, fixed income and alternative investments are used to maximize the long-term return of plan assets for a prudent level of risk. The investment portfolio primarily contains a diversified blend of equity and fixed income investments. Equity investments are diversified across U.S. and non-U.S. stocks, as well as growth, value and small to large capitalizations. Fixed income investments include corporate and government issues, with short-, mid- and long-term maturities, with a focus on investment grade when purchased and a target duration close to that of the plan liability. Investment and market risks are measured and monitored on an ongoing basis through regular investment portfolio reviews, annual liability measurements and periodic asset/liability studies. The majority of the real estate component of the portfolio is invested in a diversified portfolio of high-quality, operating properties with cash yields greater than the targeted appreciation. Investments in other alternative asset classes, including hedge funds and commodities, diversify the expected investment returns relative to the equity and fixed income investments. As a result of the Company's diversification strategies, there are no significant concentrations of risk within the portfolio of investments. The Company’s actual asset allocations are in line with target allocations. The Company rebalances asset allocations as appropriate, in order to stay within a range of allocation for each asset category. The expected return on plan assets is based on the Company’s expectation of the long-term average rate of return of the capital markets in which the plans invest. The average market returns are adjusted, where appropriate, for active asset management returns. The expected return reflects the investment policy target asset mix and considers the historical returns earned for each asset category. The Company’s plan assets at September 30, 2020 and 2019, by asset category, are as follows (in millions): Fair Value Measurements Using: Asset Category Total as of September 30, 2020 Quoted Prices Significant Significant U.S. Pension Cash and Cash Equivalents $ 36 $ — $ 36 $ — Equity Securities Large-Cap 198 198 — — Small-Cap 255 255 — — International - Developed 220 220 — — International - Emerging 33 33 — — Fixed Income Securities Government 382 159 223 — Corporate/Other 1,386 1,386 — — Total Investments in the Fair Value Hierarchy 2,510 $ 2,251 $ 259 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 276 Due to Broker (80) Total Plan Assets $ 2,706 Non-U.S. Pension Cash and Cash Equivalents $ 178 $ 178 $ — $ — Equity Securities Large-Cap 357 23 334 — International - Developed 226 52 174 — International - Emerging 4 — 4 — Fixed Income Securities Government 704 64 640 — Corporate/Other 652 321 331 — Hedge Fund 49 — 49 — Real Estate 27 27 — — Total Investments in the Fair Value Hierarchy 2,197 $ 665 $ 1,532 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 16 Total Plan Assets $ 2,213 Postretirement Cash and Cash Equivalents $ 5 $ 5 $ — $ — Equity Securities Large-Cap 23 — 23 — Small-Cap 7 — 7 — International - Developed 16 — 16 — International - Emerging 10 — 10 — Fixed Income Securities Government 19 — 19 — Corporate/Other 53 — 53 — Commodities 12 — 12 — Real Estate 8 — 8 — Total Plan Assets $ 153 $ 5 $ 148 $ — Fair Value Measurements Using: Asset Category Total as of September 30, 2019 Quoted Prices Significant Significant U.S. Pension Cash and Cash Equivalents $ 55 $ 24 $ 31 $ — Equity Securities Large-Cap 276 276 — — Small-Cap 232 232 — — International - Developed 266 233 33 — International - Emerging 52 42 10 — Fixed Income Securities Government 332 47 285 — Corporate/Other 1,266 1,266 — — Real Estate 55 55 — — Total Investments in the Fair Value Hierarchy 2,534 $ 2,175 $ 359 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 202 Total Plan Assets $ 2,736 Non-U.S. Pension Cash and Cash Equivalents $ 174 $ 174 $ — $ — Large-Cap 214 23 191 — International - Developed 289 54 235 — International - Emerging 12 1 11 — Fixed Income Securities Government 778 69 709 — Corporate/Other 517 289 228 — Hedge Fund 69 — 69 — Real Estate 31 31 — — Total Investments in the Fair Value Hierarchy 2,084 $ 641 $ 1,443 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 14 Total Plan Assets $ 2,098 Postretirement Cash and Cash Equivalents $ 6 $ 6 $ — $ — Equity Securities Large-Cap 22 — 22 — Small-Cap 8 — 8 — International - Developed 19 — 19 — International - Emerging 9 — 9 — Fixed Income Securities Government 20 — 20 — Corporate/Other 55 — 55 — Commodities 13 — 13 — Real Estate 11 — 11 — Total Plan Assets $ 163 $ 6 $ 157 $ — * The fair value of certain investments in real estate do not have a readily determinable fair value and requires the fund managers to independently arrive at fair value by calculating net asset value ("NAV") per share. In order to calculate NAV per share, the fund managers value the real estate investments using any one, or a combination of, the following methods: independent third party appraisals, discounted cash flow analysis of net cash flows projected to be generated by the investment and recent sales of comparable investments. Assumptions used to revalue the properties are updated every quarter. Due to the fact that the fund managers calculate NAV per share, the Company utilizes a practical expedient for measuring the fair value of its real-estate investments, as provided for under ASC 820, "Fair Value Measurement." In applying the practical expedient, the Company is not required to further adjust the NAV provided by the fund manager in order to determine the fair value of its investment as the NAV per share is calculated in a manner consistent with the measurement principles of ASC 946, "Financial Services - Investment Companies," and as of the Company's measurement date. The Company believes this is an appropriate methodology to obtain the fair value of these assets. For the component of the real estate portfolio under development, the investments are carried at cost until they are completed and valued by a third party appraiser. In accordance with ASU No. 2015-07, "Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)," investments for which fair value is measured using the net asset value per share practical expedient should be disclosed separate from the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of total plan assets to the amounts presented in the notes to consolidated financial statements. The following is a description of the valuation methodologies used for assets measured at fair value. Certain assets are held within commingled funds which are valued at the unitized NAV or percentage of the net asset value as determined by the manager of the fund. These values are based on the fair value of the underlying net assets owned by the fund. Cash and Cash Equivalents: The fair value of cash is valued at cost. Equity Securities: The fair value of equity securities is determined by direct quoted market prices. The underlying holdings are direct quoted market prices on regulated financial exchanges. Fixed Income Securities: The fair value of fixed income securities is determined by direct or indirect quoted market prices. If indirect quoted market prices are utilized, the value of assets held in separate accounts is not published, but the investment managers report daily the underlying holdings. The underlying holdings are direct quoted market prices on regulated financial exchanges. Commodities: The fair value of the commodities is determined by quoted market prices of the underlying holdings on regulated financial exchanges. Hedge Funds: The fair value of hedge funds is accounted for by the custodian. The custodian obtains valuations from underlying managers based on market quotes for the most liquid assets and alternative methods for assets that do not have sufficient trading activity to derive prices. The Company and custodian review the methods used by the underlying managers to value the assets. The Company believes this is an appropriate methodology to obtain the fair value of these assets. Real Estate: The fair value of real estate is determined by quoted market prices of the underlying Real Estate Investment Trusts ("REITs"), which are securities traded on an open exchange. The methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the Company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. There were no Level 3 assets as of September 30, 2020 or 2019 or any Level 3 asset activity during fiscal 2020 or 2019. Funded Status The table that follows contains the ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status (in millions): Pension Benefits Postretirement U.S. Plans Non-U.S. Plans September 30, 2020 2019 2020 2019 2020 2019 Accumulated Benefit Obligation $ 3,217 $ 3,115 $ 2,627 $ 2,549 $ — $ — Change in Projected Benefit Obligation Projected benefit obligation at beginning of year $ 3,115 $ 3,191 $ 2,652 $ 2,542 $ 174 $ 196 Service cost — 8 25 22 1 1 Interest cost 67 108 36 54 4 6 Plan participant contributions — — 3 2 4 6 Power Solutions divestiture — (390) — (86) — (9) Other divestitures — — (2) (8) — — Actuarial (gain) loss 298 441 7 337 (3) 15 Amendments made during the year — — — 26 (13) (19) Benefits and settlements paid (263) (243) (109) (126) (21) (23) Estimated subsidy received — — — — 1 1 Curtailment — — (8) — — — Other — — 4 (2) — — Currency translation adjustment — — 118 (109) (1) — Projected benefit obligation at end of year $ 3,217 $ 3,115 $ 2,726 $ 2,652 $ 146 $ 174 Change in Plan Assets Fair value of plan assets at beginning of year $ 2,736 $ 3,046 $ 2,098 $ 2,117 $ 163 $ 174 Actual return on plan assets 228 266 75 203 4 7 Power Solutions divestiture — (371) — (45) — (4) Other divestitures — — — (4) — — Employer and employee contributions 5 38 56 50 7 9 Benefits paid (112) (136) (73) (76) (21) (23) Settlement payments (151) (107) (36) (50) — — Other — — — (2) — — Currency translation adjustment — — 93 (95) — — Fair value of plan assets at end of year $ 2,706 $ 2,736 $ 2,213 $ 2,098 $ 153 $ 163 Funded status $ (511) $ (379) $ (513) $ (554) $ 7 $ (11) Amounts recognized in the statement of financial position consist of: Prepaid benefit cost $ 32 $ 30 $ 29 $ 25 $ 78 $ 66 Accrued benefit liability (543) (409) (542) (579) (71) (77) Net amount recognized $ (511) $ (379) $ (513) $ (554) $ 7 $ (11) Weighted Average Assumptions (1) Discount rate (2) 2.25 % 2.95 % 1.35 % 1.50 % 1.90 % 2.65 % Rate of compensation increase N/A N/A 2.75 % 2.80 % N/A N/A (1) Plan assets and obligations are determined based on a September 30 measurement date at September 30, 2020 and 2019. (2) The Company considers the expected benefit payments on a plan-by-plan basis when setting assumed discount rates. As a result, the Company uses different discount rates for each plan depending on the plan jurisdiction, the demographics of participants and the expected timing of benefit payments. For the U.S. pension and postretirement plans, the Company uses a discount rate provided by an independent third party calculated based on an appropriate mix of high quality bonds. For the non-U.S. pension and postretirement plans, the Company consistently uses the relevant country specific benchmark indices for determining the various discount rates. The Company has elected to utilize a full yield curve approach in the estimation of service and interest components of net periodic benefit cost (credit) for pension and other postretirement for plans that utilize a yield curve approach. The full yield curve approach applies the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows. Accumulated Other Comprehensive Income The amounts in AOCI in the consolidated statements of financial position, exclusive of tax impacts, that have not yet been recognized as components of net periodic benefit cost (credit) at September 30, 2020 and 2019 related to pension and postretirement benefits are $(5) million and $6 million, respectively. The amounts in AOCI expected to be recognized as components of net periodic benefit cost (credit) over the next fiscal year related to pension and postretirement benefits are not significant. Net Periodic Benefit Cost The table that follows contains the components of net periodic benefit costs, which are primarily recorded in selling, general and administrative expenses in the consolidated statements of income (in millions): Pension Benefits Postretirement Benefits U.S. Plans Non-U.S. Plans Year ended September 30, 2020 2019 2018 2020 2019 2018 2020 2019 2018 Components of Net Periodic Benefit Cost (Credit): Service cost $ — $ 8 $ 15 $ 25 $ 22 $ 23 $ 1 $ 1 $ 2 Interest cost 67 108 105 36 54 57 4 6 7 Expected return on plan assets (180) (199) (229) (111) (105) (114) (9) (9) (10) Net actuarial (gain) loss 244 361 7 43 236 (22) 2 17 5 Amortization of prior service cost (credit) — — — 1 — — (3) — — Curtailment gain — — — (8) — (2) — — — Settlement loss 6 13 — — 4 — — — — Net periodic benefit cost (credit) 137 291 (102) (14) 211 (58) (5) 15 4 Net periodic benefit cost related to discontinued operations — (2) (5) — — (7) — — (2) Net periodic benefit cost (credit) included in continuing operations $ 137 $ 289 $ (107) $ (14) $ 211 $ (65) $ (5) $ 15 $ 2 Expense Assumptions: Discount rate 2.95 % 4.10 % 3.80 % 1.50 % 2.45 % 2.40 % 2.65 % 3.80 % 3.70 % Expected return on plan assets 6.90 % 7.10 % 7.50 % 5.20 % 5.20 % 5.35 % 5.70 % 5.65 % 5.65 % Rate of compensation increase N/A 3.50 % 3.20 % 2.80 % 2.95 % 2.90 % N/A N/A N/A

Significant Restructuring and I

Significant Restructuring and Impairment Costs (Notes)	12 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
SIGNIFICANT RESTRUCTURING AND IMPAIRMENT COSTS	SIGNIFICANT RESTRUCTURING AND IMPAIRMENT COSTS To better align its resources with its growth strategies and reduce the cost structure of its global operations in certain underlying markets, the Company has committed to various restructuring plans in its Building Technologies & Solutions business and its corporate operations. Restructuring plans generally result in charges for workforce reductions, plant closures and asset impairments which are reported as restructuring and impairment costs in the Company’s consolidated statements of income. The Company expects the restructuring actions to reduce cost of sales and SG&A due to reduced employee-related costs, depreciation and amortization expense. In fiscal 2020, the Company committed to a significant restructuring plan ("2020 Plan") and recorded $297 million of restructuring and impairment costs in the consolidated statements of income. This is the total amount incurred to date and the total amount expected to be incurred for this restructuring plan. Of the restructuring and impairment costs recorded, $136 million related to the Global Products segment, $64 million related to the Building Solutions North America segment, $49 million related to the Building Solutions Asia Pacific segment, $43 million related to the Building Solutions EMEA/LA segment and $5 million related to Corporate. The restructuring actions are expected to be substantially complete in fiscal 2021. The following table summarizes the changes in the Company’s 2020 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original reserve $ 196 $ 96 $ 5 $ 297 Utilized—cash (92) — (3) (95) Utilized—noncash — (96) — (96) Currency translation 2 — — 2 Balance at September 30, 2020 $ 106 $ — $ 2 $ 108 Also included in restructuring and impairment costs in the consolidated statements of income in fiscal 2020 are goodwill impairment related to the North America Retail reporting unit of $424 million and indefinite-lived intangible asset impairments of $62 million. Refer to Note 7, "Goodwill and Other Intangible Assets," of the notes to consolidated financial statements for further information regarding these impairments. In fiscal 2018, the Company committed to a significant restructuring plan ("2018 Plan") and recorded $255 million of restructuring and impairment costs for continuing operations in the consolidated statements of income. This was the total amount incurred to date and the total amount expected to be incurred for this restructuring plan. Of the restructuring and impairment costs recorded, $113 million related to the Global Products segment, $56 million related to the Building Solutions EMEA/LA segment, $50 million related to Corporate, $20 million related to the Building Solutions North America segment and $16 million related to the Building Solutions Asia Pacific segment. The restructuring actions were substantially complete in 2020. Additionally, the Company recorded $8 million of restructuring and impairment costs related to Power Solutions in fiscal 2018. This is reported within discontinued operations. The following table summarizes the changes in the Company’s 2018 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original reserve $ 209 $ 42 $ 12 $ 263 Utilized—cash (45) — (2) (47) Utilized—noncash — (42) — (42) Balance at September 30, 2018 $ 164 $ — $ 10 $ 174 Utilized—cash (61) — (6) (67) Transfer to liabilities held for sale (4) — — (4) Currency translation (1) — — (1) Balance at September 30, 2019 $ 98 $ — $ 4 $ 102 Utilized—cash (69) — — (69) Adoption of ASC 842 (1) — — (4) (4) Currency translation 1 — — 1 Balance at September 30, 2020 $ 30 $ — $ — $ 30 (1) Represents liability for facility closings recorded as an offset to right-of-use asset upon adoption of ASC 842. In fiscal 2017, the Company committed to a significant restructuring plan ("2017 Plan") and recorded $347 million of restructuring and impairment costs for continuing operations in the consolidated statements of income. This was the total amount incurred to date and the total amount expected to be incurred for this restructuring plan. Of the restructuring and impairment costs recorded, $166 million related to Corporate, $74 million related to the Building Solutions EMEA/LA segment, $59 million related to the Building Solutions North America segment, $32 million related to the Global Products segment and $16 million related to the Building Solutions Asia Pacific segment. The restructuring actions were substantially complete in fiscal 2020. Additionally, the Company recorded $20 million of restructuring and impairment costs related to Power Solutions in fiscal 2017. This is reported within discontinued operations. The following table summarizes the changes in the Company’s 2017 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original Reserve $ 276 $ 77 $ 14 $ 367 Utilized—cash (75) — — (75) Utilized—noncash — (77) (1) (78) Adjustment to restructuring reserves 25 — — 25 Balance at September 30, 2017 $ 226 $ — $ 13 $ 239 Utilized—cash (152) — (6) (158) Currency translation (1) — — (1) Balance at September 30, 2018 $ 73 $ — $ 7 $ 80 Utilized—cash (11) — (2) (13) Transfer to liabilities held for sale (3) — — (3) Currency translation (3) — — (3) Balance at September 30, 2019 $ 56 $ — $ 5 $ 61 Utilized—cash (50) — — (50) Adoption of ASC 842 (1) — — (5) (5) Balance at September 30, 2020 $ 6 $ — $ — $ 6 (1) Represents liability for facility closings recorded as an offset to right-of-use asset upon adoption of ASC 842. The Company's fiscal 2020, 2018 and 2017 restructuring plans included workforce reductions of approximately 16,400 employees. Restructuring charges associated with employee severance and termination benefits are paid over the severance period granted to each employee or on a lump sum basis in accordance with individual severance agreements. As of September 30, 2020, approximately 12,700 of the employees have been separated from the Company pursuant to the restructuring plans. In addition, the restructuring plans included nine plant closures. As of September 30, 2020, eight of the nine plants have been closed.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets (Notes)	12 Months Ended
	Sep. 30, 2020
Disclosure Impairment Of Long Lived Assets [Abstract]
IMPAIRMENT OF LONG-LIVED ASSETS	IMPAIRMENT OF LONG-LIVED ASSETS In fiscal 2020, the Company concluded it had triggering events requiring assessment of impairment for certain of its long-lived assets caused by the economic impacts of the COVID-19 pandemic on the North America Retail asset group. The Company performed a quantitative impairment analysis and determined there was no impairment of long-lived assets as of September 30, 2020. In fiscal 2020, the Company concluded it had a triggering event requiring assessment of impairment for certain of its long-lived assets in conjunction with its restructuring actions announced in fiscal 2020. As a result, the Company reviewed the long-lived assets for impairment and recorded $81 million of asset impairment charges within restructuring and impairment costs in the consolidated statements of income. Of these impairment charges, $42 million related to the Global Products segment, $24 million related to the Building Solutions Asia Pacific segment and $15 million related to the Building Solutions North America segment. The impairments were primarily measured under a market approach utilizing an appraisal to determine fair values of the impaired assets. This method is consistent with the methods the Company employed in prior periods to value other long-lived assets. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." In fiscal 2019 and again in 2020, the Company concluded it had a triggering event requiring assessment of impairment for certain of its long-lived assets in conjunction with the plans to dispose of a business within its Global Products segment that met the criteria to be classified as held for sale. Assets and liabilities held for sale are required to be recorded at the lower of carrying value or fair value less any costs to sell. Accordingly, the Company recorded impairment charges of $250 million, including $15 million in fiscal 2020 and $235 million in fiscal 2019, within restructuring and impairment costs in the consolidated statements of income to write down the carrying value of the assets held for sale to fair value less any costs to sell. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." In fiscal 2018, the Company concluded it had a triggering event requiring assessment of impairment for certain of its long-lived assets in conjunction with its restructuring actions announced in fiscal 2018. As a result, the Company reviewed the long-lived assets for impairment and recorded $36 million of asset impairment charges within restructuring and impairment costs in the consolidated statements of income. Of the total impairment charges, $31 million related to the Global Products segment and $5 million related to Corporate assets. In addition, the Company recorded $6 million of asset impairments within discontinued operations related to the Power Solutions segment in fiscal 2018. Refer to Note 16, "Significant Restructuring and Impairment Costs," of the notes to consolidated financial statements for additional information. The impairments were measured under a market approach utilizing an appraisal to determine fair values of the impaired assets. This method is consistent with the methods the Company employed in prior periods to value other long-lived assets. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." During September 30, 2020, 2019 and 2018, the Company concluded it did not have any other triggering events requiring assessment of impairment of its long-lived assets. Refer to Note 1, "Summary of Significant Accounting Policies," and Note 7, "Goodwill and Other Intangible Assets," of the notes to consolidated financial statements for discussion of the Company’s goodwill impairment testing.

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The more significant components of the Company’s income tax provision from continuing operations are as follows (in millions): Year Ended September 30, 2020 2019 2018 Tax expense at Ireland statutory rate $ 113 $ 132 $ 193 U.S. state income tax, net of federal benefit 8 15 15 Income subject to the U.S. federal tax rate (92) (110) 39 Income subject to rates different than the statutory rate 99 38 (201) Reserve and valuation allowance adjustments (70) (284) 31 Impact of acquisitions and divestitures — — 16 U.S. Tax Reform discrete items — — 108 Restructuring and impairment costs 50 (24) (4) Income tax provision (benefit) $ 108 $ (233) $ 197 The statutory tax rate in Ireland of 12.5% is being used as a comparison since the Company is domiciled in Ireland. For fiscal 2020, the effective tax rate for continuing operations was 12% and was lower than the statutory tax rate primarily due to tax audit reserve adjustments, the income tax effects of mark-to-market adjustments, valuation allowance adjustments and the benefits of continuing global tax planning initiatives, partially offset by a discrete tax charge related to the remeasurement of deferred tax assets and liabilities as a result of Swiss tax reform, the tax impact of an impairment charge and tax rate differentials. For fiscal 2019, the effective rate for continuing operations was below the statutory rate primarily due to tax audit reserve adjustments, the income tax effects of mark-to-market adjustments, a tax indemnification reserve release, the tax benefits of an asset held for sale impairment charge and continuing global tax planning initiatives, partially offset by valuation allowance adjustments as a result of tax law changes, a discrete tax charge related to newly enacted regulations related to U.S. Tax Reform and tax rate differentials. For fiscal 2018, the effective rate for continuing operations was above the statutory rate primarily due to the discrete net impacts of U.S. Tax Reform, the final income tax effects of the completed divestiture of the Scott Safety business, and valuation allowance adjustments, partially offset by tax audit closures, tax benefits due to changes in entity tax status, the benefits of continuing global tax planning initiatives and tax rate differentials. Valuation Allowances The Company reviews the realizability of its deferred tax asset valuation allowances on a quarterly basis, or whenever events or changes in circumstances indicate that a review is required. In determining the requirement for a valuation allowance, the historical and projected financial results of the legal entity or consolidated group recording the net deferred tax asset are considered, along with any other positive or negative evidence. Since future financial results may differ from previous estimates, periodic adjustments to the Company’s valuation allowances may be necessary. In the fourth quarter of fiscal 2020, the Company performed an analysis related to the realizability of its worldwide deferred tax assets. As a result, and after considering feasible tax planning initiatives and other positive and negative evidence, the Company determined that it was more likely than not that certain deferred tax assets primarily within the U.S. would not be realized, and it is more likely than not that certain deferred tax assets of Canada would be realized. The valuation allowance adjustments resulted in a $26 million net benefit to income tax expense in the three month period ended September 30, 2020. In the fourth quarter of fiscal 2019, the Company performed an analysis related to the realizability of its worldwide deferred tax assets. As a result, and after considering feasible tax planning initiatives and other positive and negative evidence, the Company determined that it was more likely than not that certain deferred tax assets primarily within the U.S., Belgium, Japan and the United Kingdom would not be realized, and it is more likely than not that certain deferred tax assets of the U.S. and France will be realized. The valuation allowance adjustments resulted in an immaterial net impact to income tax expense for the three-month period ended September 30, 2019. In the first quarter of fiscal 2019, as a result of changes to U.S. tax law, the Company recorded a discrete tax charge of $76 million related to valuation allowances on certain U.S. deferred tax assets. In the fourth quarter of fiscal 2018, the Company performed an analysis related to the realizability of its worldwide deferred tax assets. As a result, and after considering feasible tax planning initiatives and other positive and negative evidence, the Company determined that it was more likely than not that certain deferred tax assets primarily within Germany would not be realized. Therefore, the Company recorded $56 million of valuation allowances as income tax expense in the three-month period ended September 30, 2018. Uncertain Tax Positions The Company is subject to income taxes in the U.S. and numerous foreign jurisdictions. Judgment is required in determining its worldwide provision for income taxes and recording the related assets and liabilities. In the ordinary course of the Company’s business, there are many transactions and calculations where the ultimate tax determination is uncertain. The Company is regularly under audit by tax authorities. At September 30, 2020, the Company had gross tax effected unrecognized tax benefits for continuing operations of $2,528 million of which $2,132 million, if recognized, would impact the effective tax rate. Total net accrued interest at September 30, 2020 was approximately $205 million (net of tax benefit). At September 30, 2019, the Company had gross tax effected unrecognized tax benefits for continuing operations of $2,451 million of which $2,121 million, if recognized, would impact the effective tax rate. Total net accrued interest at September 30, 2019 was approximately $181 million (net of tax benefit). At September 30, 2018, the Company had gross tax effected unrecognized tax benefits for continuing operations of $2,358 million of which $2,225 million, if recognized, would impact the effective tax rate. Total net accrued interest at September 30, 2018 was approximately $119 million (net of tax benefit). A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions): Year Ended September 30, 2020 2019 2018 Beginning balance, October 1 $ 2,451 $ 2,358 $ 2,161 Additions for tax positions related to the current year 128 433 435 Additions for tax positions of prior years 129 347 7 Reductions for tax positions of prior years (27) (88) (201) Settlements with taxing authorities (54) — (19) Statute closings and audit resolutions (99) (599) (25) Ending balance, September 30 $ 2,528 $ 2,451 $ 2,358 During fiscal 2020, tax audit resolutions resulted in a $44 million net benefit to income tax expense. During fiscal 2019, the Company settled tax examinations impacting fiscal years 2015 to 2016 and adjusted various tax audit reserves which resulted in a $586 million net benefit to income tax expense in the fourth quarter. In the third quarter of fiscal 2019, the Company recorded a discrete charge related to newly enacted regulations related to U.S. Tax Reform and a discrete charge related to non-U.S. tax examinations which impacted the Company’s reserves for uncertain tax positions resulting in a $226 million net charge to income tax expense. During fiscal 2018, the Company settled tax examinations impacting fiscal years 2010 to fiscal 2012 which resulted in a $25 million net benefit to income tax expense. In the U.S., fiscal years 2017 through 2018 are currently under exam by the Internal Revenue Service (“IRS”) for certain legal entities. Additionally, the Company is currently under exam in the following major non-U.S. jurisdictions for continuing operations: Tax Jurisdiction Tax Years Covered Belgium 2015 - 2019 China 2019 Germany 2007 - 2018 Luxembourg 2017 - 2018 Mexico 2016 - 2017, 2019 Taiwan 2019 United Kingdom 2014 - 2015, 2017 It is reasonably possible that certain tax examinations and/or tax litigation will conclude within the next twelve months, which could impact tax expense. Other Tax Matters During fiscal 2020, the Company incurred charges for restructuring and impairment costs for continuing operations of $783 million. Refer to Note 7, "Goodwill and Other Intangible Assets," Note 16, "Significant Restructuring and Impairment Costs," and Note 17, "Impairment of Long-Lived Assets," of the notes to consolidated financial statements for additional information. These costs generated tax benefits of $48 million, which reflects the Company’s current tax position in these jurisdictions. During fiscal 2020, 2019, and 2018, the Company recorded transaction and integration costs for continuing operations of $135 million, $317 million and $226 million, respectively. These costs generated tax benefits of $18 million, $35 million and $27 million, respectively, which reflects the Company’s current tax position in these jurisdictions. During fiscal 2020, 2019 and 2018, the Company recorded mark-to-market gains (losses) of $(274) million, $(618) million and $24 million, respectively. These gains (losses) generated tax expense (benefit) of $(65) million, $(130) million and $1 million, respectively, which reflects the Company’s current tax position in these jurisdictions. During fiscal 2019, the Company recorded a $235 million impairment charge related to assets held for sale. Refer to Note 17, "Impairment of Long-Lived Assets," of the notes to consolidated financial statements for further information regarding the impairment charge. The impairment charge generated a $53 million tax benefit. Also during fiscal 2019, the Company released a $226 million tax indemnification reserve, which was recorded within selling, general and administrative expenses in the consolidated statements of income. The reserve release generated no income tax expense. During fiscal 2018, the Company incurred charges for restructuring and impairment costs for continuing operations of $255 million. Refer to Note 16, "Significant Restructuring and Impairment Costs," of the notes to consolidated financial statements for additional information. These costs generated tax benefits of $36 million, which reflects the Company’s current tax position in these jurisdictions. In the fourth quarter of fiscal 2018, the Company recorded a tax benefit of $139 million due to changes in entity tax status. In the first quarter of fiscal 2018, the Company completed the sale of its Scott Safety business to 3M Company. In connection with the sale, the Company recorded a pre-tax gain of $114 million and income tax expense of $30 million. Refer to Note 2, "Acquisitions and Divestitures," of the notes to consolidated financial statements for additional information. Impacts of Tax Legislation and Change in Statutory Tax Rates On March 27, 2020, in response to the COVID-19 pandemic, the “Coronavirus Aid, Relief and Economic Security Act” (“CARES”) was signed into law by the President of the United States. The CARES Act includes, among other things, U.S. corporate income tax provisions related to net operating loss carryback periods, alternative minimum tax credits, modifications to interest deduction limitations and technical corrections on tax depreciation methods for qualified improvement property. A majority of non-U.S. countries have also introduced various COVID-19 related corporate income tax relief provisions. The Company does not expect either the U.S. or non-U.S. corporate income tax provisions to have a material effect on its financial statements. In the first quarter of fiscal 2020, the Company recorded a noncash discrete tax charge of $30 million due to the remeasurement of deferred tax assets and liabilities related to Switzerland and the canton of Schaffhausen. On September 28, 2018, the Swiss Parliament approved the Federal Act on Tax Reform and AHV Financing (“TRAF”), which was subsequently approved by the Swiss electorate on May 19, 2019. During the fourth quarter of fiscal 2019, the Swiss Federal Council enacted TRAF which became effective for the Company on January 1, 2020. The impacts of the federal enactment did not have a material impact to the Company’s financial statements. TRAF also provides for parameters which enable the Swiss cantons to adjust tax rates and establish new regulations for companies. As of September 30, 2019, the canton of Schaffhausen had not concluded its public referendum; however, the enactment did occur during the first quarter of fiscal 2020. On December 22, 2017, the “Tax Cuts and Jobs Act” (H.R. 1) was enacted and significantly revised U.S. corporate income tax by, among other things, lowering corporate income tax rates, imposing a one-time transition tax on deemed repatriated earnings of non-U.S. subsidiaries, and implementing a territorial tax system and various base erosion minimum tax provisions. In connection with the Company’s analysis of the impact of the U.S. tax law changes, the Company recorded a provisional net tax charge of $108 million during fiscal 2018 consistent with guidance prescribed by Staff Accounting Bulletin 118. This provisional net tax charge arises from a benefit of $108 million due to the remeasurement of U.S. deferred tax assets and liabilities, offset by the Company’s tax charge relating to the one-time transition tax on deemed repatriated earnings, inclusive of all relevant taxes, of $216 million. The Company’s estimated benefit of the remeasurement of U.S. deferred tax assets and liabilities increased from $101 million as of December 31, 2017 to $108 million as of September 30, 2018 due to calculation refinement of the Company’s estimated impact. The Company remeasured certain deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21% or the blended fiscal 2018 rate of 24.5%. The Company’s tax charge for transition tax decreased from $305 million as of December 31, 2017 to $216 million as of September 30, 2018 due to further analysis of the Company’s post-1986 non-U.S. earnings and profits (“E&P”) previously deferred from U.S. federal taxation and refinement of the estimated impact of tax law changes. During fiscal 2019, the Company completed its analysis of all enactment-date income tax effects of the U.S. tax law change with no further adjustment to the provisional amounts recorded as of September 30, 2018. During the fiscal years ended 2020, 2019 and 2018, other tax legislation was adopted in various jurisdictions. These law changes did not have a material impact on the Company's consolidated financial statements. Continuing Operations Components of the provision (benefit) for income taxes on continuing operations were as follows (in millions): Year Ended September 30, 2020 2019 2018 Current U.S. federal $ 309 $ (1,025) $ 476 U.S. state 72 (33) 26 Non-U.S. 264 213 434 645 (845) 936 Deferred U.S. federal (382) 412 (372) U.S. state (43) 84 (10) Non-U.S. (112) 116 (357) (537) 612 (739) Income tax provision (benefit) $ 108 $ (233) $ 197 Consolidated U.S. income (loss) from continuing operations before income taxes and noncontrolling interests for the fiscal years ended September 30, 2020, 2019 and 2018 was $(385) million, $(259) million and $261 million, respectively. Consolidated non-U.S. income from continuing operations before income taxes and noncontrolling interests for the fiscal years ended September 30, 2020, 2019 and 2018 was $1,288 million, $1,315 million and $1,285 million, respectively. Continuing operations income taxes paid (refunded) for the fiscal years ended September 30, 2020, 2019 and 2018 were $(386) million, $377 million and $81 million, respectively. At September 30, 2020 and 2019, the Company recorded within the continuing operations consolidated statements of financial position in other current assets approximately $252 million and $1,069 million, respectively, of income tax assets. At September 30, 2020 and 2019, the Company recorded within the continuing operations consolidated statements of financial position in other current liabilities approximately $243 million and $159 million, respectively, of accrued income tax liabilities. The Company has not provided U.S. or non-U.S. income taxes on approximately $22.0 billion of outside basis differences of consolidated subsidiaries of Johnson Controls International plc. The Company is indefinitely reinvested in these basis differences. The reduction of the outside basis differences via the sale or liquidation of these subsidiaries and/or distributions could create taxable income. The Company's intent is to reduce the outside basis differences only when it would be tax efficient. Given the numerous ways in which the basis differences may be reduced, it is not practicable to estimate the amount of unrecognized withholding taxes and deferred tax liability on the outside basis differences. Deferred taxes were classified in the consolidated statements of financial position as follows (in millions): September 30, 2020 2019 Other noncurrent assets $ 862 $ 552 Other noncurrent liabilities (385) (588) Net deferred tax asset (liability) $ 477 $ (36) Temporary differences and carryforwards which gave rise to deferred tax assets and liabilities included (in millions): September 30, 2020 2019 Deferred tax assets Accrued expenses and reserves $ 474 $ 437 Employee and retiree benefits 286 265 Property, plant and equipment 182 — Net operating loss and other credit carryforwards 6,306 5,664 Research and development 112 106 Other, net 99 — 7,459 6,472 Valuation allowances (5,518) (5,068) 1,941 1,404 Deferred tax liabilities Property, plant and equipment — 139 Subsidiaries, joint ventures and partnerships 730 499 Intangible assets 734 759 Other, net — 43 1,464 1,440 Net deferred tax asset (liability) $ 477 $ (36) At September 30, 2020, the Company had available net operating loss carryforwards of approximately $25.0 billion, of which $15.1 billion will expire at various dates between 2021 and 2040, and the remainder has an indefinite carryforward period. The Company had available U.S. foreign tax credit carryforwards at September 30, 2020 of $35 million which will expire in 2030. The valuation allowance, generally, is for loss and credit carryforwards for which realization is uncertain because it is unlikely that the losses and/or credits will be realized given the lack of sustained profitability and/or limited carryforward periods in certain countries.

Segment Information (Notes)

Segment Information (Notes)	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
SEGMENT INFORMATION	SEGMENT INFORMATION ASC 280, "Segment Reporting," establishes the standards for reporting information about segments in financial statements. In applying the criteria set forth in ASC 280, the Company has determined that it has four reportable segments for financial reporting purposes. Building Solutions North America: Building Solutions North America designs, sells, installs, and services HVAC, controls, refrigeration, integrated electronic security, and integrated fire detection and suppression systems for commercial, industrial, retail, small business, institutional and governmental customers in North America. Building Solutions North America also provides energy efficiency solutions and technical services, including inspection, scheduled maintenance, and repair and replacement of mechanical and control systems, as well as data-driven “smart building” solutions, to non-residential building and industrial applications in the North American marketplace. Building Solutions EMEA/LA: Building Solutions EMEA/LA designs, sells, installs, and services HVAC, controls, refrigeration, integrated electronic security, integrated fire detection and suppression systems, and provides technical services, including data-driven “smart building” solutions, to markets in Europe, the Middle East, Africa and Latin America. Building Solutions Asia Pacific: Building Solutions Asia Pacific designs, sells, installs, and services HVAC, controls, refrigeration, integrated electronic security, integrated fire detection and suppression systems, and provides technical services, including data-driven “smart building” solutions, to the Asia Pacific marketplace. Global Products: Global Products designs and produces heating and air conditioning for residential and commercial applications, and markets products and refrigeration systems to replacement and new construction market customers globally. The Global Products business also designs, manufactures and sells fire protection and security products, including intrusion security, anti-theft devices, and access control and video management systems, for commercial, industrial, retail, residential, small business, institutional and governmental customers worldwide. Global Products also includes the Johnson Controls-Hitachi joint venture. On October 1, 2018, the Company adopted ASU No. 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." The new standard requires the mark-to-market of marketable securities investments previously recorded within accumulated other comprehensive income on the statement of financial position be recorded in the statement of income on a prospective basis beginning as of the adoption date. As these restricted investments do not relate to the underlying operating performance of its business, the Company’s definition of segment earnings excludes the mark-to-market adjustments in fiscal 2020 and 2019. Management evaluates the performance of its business segments primarily on segment earnings before interest, taxes and amortization ("EBITA"), which represents income from continuing operations before income taxes and noncontrolling interests, excluding general corporate expenses, intangible asset amortization, net financing charges, restructuring and impairment costs, and net mark-to-market adjustments related to pension and postretirement plans and restricted asbestos investments. Financial information relating to the Company’s reportable segments is as follows (in millions): Year Ended September 30, 2020 2019 2018 Net Sales Building Solutions North America $ 8,605 $ 9,031 $ 8,679 Building Solutions EMEA/LA 3,440 3,655 3,696 Building Solutions Asia Pacific 2,403 2,658 2,553 Global Products 7,869 8,624 8,472 Total net sales $ 22,317 $ 23,968 $ 23,400 Year Ended September 30, 2020 2019 2018 Segment EBITA Building Solutions North America (1) $ 1,157 $ 1,153 $ 1,109 Building Solutions EMEA/LA (2) 338 368 344 Building Solutions Asia Pacific (3) 319 341 347 Global Products (4) 1,134 1,179 1,338 Total segment EBITA $ 2,948 $ 3,041 $ 3,138 Amortization of intangible assets (386) (377) (376) Corporate expenses (5) (371) (405) (584) Net financing charges (231) (350) (401) Restructuring and impairment costs (783) (235) (255) Net mark-to-market adjustments (274) (618) 24 Income from continuing operations before income taxes $ 903 $ 1,056 $ 1,546 September 30, 2020 2019 2018 Assets Building Solutions North America (6) $ 15,215 $ 15,562 $ 15,384 Building Solutions EMEA/LA (7) 4,989 4,786 4,997 Building Solutions Asia Pacific (8) 2,720 2,657 2,743 Global Products (9) 13,882 13,945 14,261 36,806 36,950 37,385 Assets held for sale 147 158 8,203 Unallocated 3,862 5,179 3,209 Total $ 40,815 $ 42,287 $ 48,797 Year Ended September 30, 2020 2019 2018 Depreciation/Amortization Building Solutions North America $ 233 $ 233 $ 236 Building Solutions EMEA/LA 102 112 110 Building Solutions Asia Pacific 24 23 28 Global Products 414 396 390 773 764 764 Corporate 49 61 60 Continuing Operations 822 825 824 Discontinued Operations — 32 261 Total $ 822 $ 857 $ 1,085 Year Ended September 30, 2020 2019 2018 Capital Expenditures Building Solutions North America $ 93 $ 119 $ 114 Building Solutions EMEA/LA 99 93 73 Building Solutions Asia Pacific 36 26 26 Global Products 191 310 307 419 548 520 Corporate 24 38 125 Continuing Operations 443 586 645 Discontinued Operations — 197 385 Total $ 443 $ 783 $ 1,030 (1) Building Solutions North America segment EBITA for the years ended September 30, 2020 and 2018 excludes $520 million and $20 million, respectively, of restructuring and impairment costs. For the year ended September 30, 2020, Building Solutions North America includes $1 million of equity losses. (2) Building Solutions EMEA/LA segment EBITA for the years ended September 30, 2020 and 2018 excludes $59 million, and $56 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions EMEA/LA segment EBITA includes $6 million, $12 million and $1 million, respectively, of equity income. (3) Building Solutions Asia Pacific segment EBITA for the years ended September 30, 2020 and 2018 excludes $56 million and $16 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions Asia Pacific segment EBITA includes less than $1 million, $1 million and $1 million, respectively, of equity income. (4) Global Products segment EBITA for the years ended September 30, 2020, 2019 and 2018 excludes $143 million, $235 million and $113 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Global Products segment EBITA includes $166 million, $179 million and $175 million, respectively, of equity income. (5) Corporate expenses for the years ended September 30, 2020 and 2018 excludes $5 million and $50 million, respectively, of restructuring and impairment costs. (6) Buildings Solutions North America assets as of September 30, 2020, 2019 and 2018 include $7 million, $8 million and $8 million, respectively, of investments in partially-owned affiliates. (7) Building Solutions EMEA/LA assets as of September 30, 2020, 2019 and 2018 include $108 million, $109 million and $99 million, respectively, of investments in partially-owned affiliates. (8) Building Solutions Asia Pacific assets as of September 30, 2020, 2019 and 2018 include $2 million and $6 million, and $1 million, respectively, of investments in partially-owned affiliates. (9) Global Products assets as of September 30, 2020, 2019 and 2018 include $797 million, $730 million and $740 million, respectively, of investments in partially-owned affiliates. In fiscal years 2020, 2019 and 2018 no customer exceeded 10% of consolidated net sales. Geographic Segments Financial information relating to the Company’s operations by geographic area is as follows (in millions): Year Ended September 30, 2020 2019 2018 Net Sales United States $ 11,007 $ 11,773 $ 11,306 China 1,206 1,424 1,480 Japan 1,789 1,943 1,903 Germany 583 629 616 United Kingdom 980 1,042 1,075 Taiwan 725 612 661 Other foreign 4,113 4,625 4,423 Other European countries 1,914 1,920 1,936 Total $ 22,317 $ 23,968 $ 23,400 Long-Lived Assets (Year-end) United States $ 1,713 $ 1,824 $ 1,879 China 164 326 332 Japan 204 228 209 Germany 22 20 19 United Kingdom 70 77 73 Taiwan 133 141 154 Other foreign 567 568 464 Other European countries 186 164 170 Total $ 3,059 $ 3,348 $ 3,300

Nonconsolidated Partially-Owned

Nonconsolidated Partially-Owned Affiliates (Notes)	12 Months Ended
	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
NONCONSOLIDATED PARTIALLY-OWNED AFFILIATES	NONCONSOLIDATED PARTIALLY-OWNED AFFILIATES Investments in the net assets of nonconsolidated partially-owned affiliates are stated in the "Investments in partially-owned affiliates" line in the consolidated statements of financial position as of September 30, 2020 and 2019. Equity in the net income of nonconsolidated partially-owned affiliates is stated in the "Equity income" line in the consolidated statements of income for the years ended September 30, 2020, 2019 and 2018. The following table presents aggregated summarized financial data for the Company’s nonconsolidated partially-owned affiliates which were considered significant subsidiaries in fiscal 2019 and 2018, but not in fiscal 2020 due to adoption of the SEC Final Rule Release No. 33-10786. The amounts included in the table below represent 100% of the results of continuing operations of such nonconsolidated partially-owned affiliates accounted for under the equity method. Summarized balance sheet data as of September 30, 2019 is as follows (in millions): September 30, 2019 Current assets $ 2,941 Noncurrent assets 1,020 Total assets $ 3,961 Current liabilities $ 2,135 Noncurrent liabilities 157 Noncontrolling interests 67 Shareholders’ equity 1,602 Total liabilities and shareholders’ equity $ 3,961 Summarized income statement data for the years ended September 30, 2019 and 2018 is as follows (in millions): Year Ended September 30, 2019 2018 Net sales $ 3,882 $ 3,974 Gross profit 1,070 1,049 Net income 411 390 Income attributable to noncontrolling interests 13 10 Net income attributable to the entity 398 380

Guarantees (Notes)

Guarantees (Notes)	12 Months Ended
	Sep. 30, 2020
Guarantees [Abstract]
GUARANTEES	GUARANTEES Certain of the Company's subsidiaries at the business segment level have guaranteed the performance of third-parties and provided financial guarantees for uncompleted work and financial commitments. The terms of these guarantees vary with end dates ranging from the current fiscal year through the completion of such transactions and would typically be triggered in the event of nonperformance. Performance under the guarantees, if required, would not have a material effect on the Company's financial position, results of operations or cash flows. The Company offers warranties to its customers depending upon the specific product and terms of the customer purchase agreement. A typical warranty program requires that the Company replace defective products within a specified time period from the date of sale. The Company records an estimate for future warranty-related costs based on actual historical return rates and other known factors. Based on analysis of return rates and other factors, the Company’s warranty provisions are adjusted as necessary. The Company monitors its warranty activity and adjusts its reserve estimates when it is probable that future warranty costs will be different than those estimates. The Company’s product warranty liability for continuing operations is recorded in the consolidated statements of financial position in other current liabilities if the warranty is less than one year and in other noncurrent liabilities if the warranty extends longer than one year. The changes in the carrying amount of the Company’s total product warranty liability for continuing operations for the fiscal years ended September 30, 2020 and 2019 were as follows (in millions). Extended warranty for which deferred revenue is recorded is not included in the table below, but rather included within the contract balances table in the Note 4, "Revenue Recognition," of the notes to consolidated financial statements for all periods presented. Year Ended 2020 2019 Balance at beginning of period $ 156 $ 197 Accruals for warranties issued during the period 71 78 Accruals from acquisitions and divestitures — 1 Accruals related to pre-existing warranties (including changes in estimates) 9 (39) Settlements made (in cash or in kind) during the period (71) (79) Currency translation 2 (2) Balance at end of period $ 167 $ 156

Commitments and Contingencies (

Commitments and Contingencies (Notes)	12 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Environmental Matters The Company accrues for potential environmental liabilities when it is probable a liability has been incurred and the amount of the liability is reasonably estimable. As of September 30, 2020, reserves for environmental liabilities for continuing operations totaled $130 million, of which $61 million was recorded within other current liabilities and $69 million was recorded within other noncurrent liabilities in the consolidated statements of financial position. Reserves for environmental liabilities for continuing operations totaled $159 million at September 30, 2019, of which $52 million was recorded within other current liabilities and $107 million was recorded within other noncurrent liabilities in the consolidated statements of financial position. Tyco Fire Products L.P. (“Tyco Fire Products”), in coordination with the Wisconsin Department of Natural Resources ("WDNR"), has been conducting an environmental assessment of its Fire Technology Center ("FTC") located in Marinette, Wisconsin and surrounding areas in the City of Marinette and Town of Peshtigo, Wisconsin. In connection with the assessment, perfluorooctane sulfonate ("PFOS") and perfluorooctanoic acid ("PFOA") and/or other per- and poly fluorinated substances ("PFAS") have been detected at the FTC and in groundwater and surface water outside of the boundaries of the FTC. Tyco Fire Products continues to investigate the extent of potential migration of these compounds and is working with WDNR to address these issues insofar as they related to this migration. During the third quarter of 2019, the Company increased its environmental reserves, which included $140 million related to remediation efforts to be undertaken to address contamination relating to fire-fighting foams containing PFAS compounds at or near the FTC, as well as the continued remediation of arsenic and other contaminants at the Tyco Fire Products Stanton Street manufacturing facility also located in Marinette, Wisconsin (the “Stanton Street Facility”). The Company is not able to estimate a possible loss or range of loss in excess of the established accruals at this time. A substantial portion of the increased reserves relates to remediation resulting from the use of fire-fighting foams containing PFAS at the FTC. The use of fire-fighting foams at the FTC was primarily for training and testing purposes in order to ensure that such products sold by the Company’s affiliates, Chemguard, Inc. ("Chemguard") and Tyco Fire Products, were effective at suppressing high intensity fires that may occur at military installations, airports or elsewhere. The reserve was recorded in the quarter ended June 30, 2019 following a comprehensive review by independent environmental consultants related to the presence of PFAS at or near the FTC, as well as remediation discussions with the WDNR. On June 21, 2019, the WDNR announced that it had received from the Wisconsin Department of Health Services (“WDHS”) a recommendation for groundwater quality standards as to, among other compounds, PFOA and PFOS. The WDHS recommended a groundwater enforcement standard for PFOA and PFOS of 20 parts per trillion. On August 22, 2019, the Governor of Wisconsin issued an executive order that, among other things, directed the WDNR to create a PFAS Coordinating Council and to work with other Wisconsin agencies (including WDHS) to establish final groundwater quality standards based on the WDHS’s prior recommendation. In July 2019, the Company received a letter from the WDNR directing the expansion of the evaluation of PFAS in the Marinette region to include (1) biosolids sludge produced by the City of Marinette Waste Water Treatment Plant and spread on certain fields in the area and (2) the Menominee and Peshtigo Rivers. Tyco Fire Products voluntarily responded to the WDNR’s letter to request additional necessary information. On October 16, 2019, the WDNR issued a “Notice of Noncompliance” to Tyco Fire Products and Johnson Controls, Inc. regarding the WDNR’s July 3, 2019 letter. The letter stated that “if you fail to take the actions required by Wis. Stat. § 292.11 to address this contamination, the DNR will move forward under Wis. Stat. § 292.31 to implement the SI workplan and evaluate further environmental enforcement actions and cost recovery under Wis. Stat. § 292.31(8).” The WDNR issued a further letter regarding the issue on November 4, 2019. In February 2020, the WDNR sent a letter to Tyco Fire Products and Johnson Controls, Inc. further directing the expansion of the evaluation of PFAS in the Marinette region to include investigation activities south and west of the previously defined FTC study area. Tyco Fire Products and Johnson Controls, Inc. believe that they have complied with all applicable environmental laws and regulations. The Company cannot predict what regulatory or enforcement actions, if any, might result from the WDNR’s actions, or the consequences of any such actions. Tyco Fire Products has been engaged in remediation activities at the Stanton Street Facility since 1990. Its corporate predecessor, Ansul Incorporated (“Ansul”) manufactured arsenic-based agricultural herbicides at the Stanton Street Facility, which resulted in significant arsenic contamination of soil and groundwater on the site and in parts of the adjoining Menominee River. In 2009, Ansul entered into an Administrative Consent Order (the "Consent Order") with the U.S. Environmental Protection Agency to address the presence of arsenic at the site. Under this agreement, Tyco Fire Products’ principal obligations are to contain the arsenic contamination on the site, pump and treat on-site groundwater, dredge, treat and properly dispose of contaminated sediments in the adjoining river areas, and monitor contamination levels on an ongoing basis. Activities completed under the Consent Order since 2009 include the installation of a subsurface barrier wall around the facility to contain contaminated groundwater, the installation of a groundwater extraction and treatment system and the dredging and offsite disposal of treated river sediment. The increase in the reserve related to the Stanton Street Facility was recorded following a further review of the Consent Order, which resulted in the identification of several structural upgrades needed to preserve the effectiveness of prior remediation efforts. In addition to ongoing remediation activities, the Company is also working with the WDNR to investigate the presence of PFAS at or near the Stanton Street Facility as part of the evaluation of PFAS in the Marinette region. Potential environmental liabilities accrued by the Company do not take into consideration possible recoveries of future insurance proceeds. They do, however, take into account the likely share other parties will bear at remediation sites. It is difficult to estimate the Company’s ultimate level of liability at many remediation sites due to the large number of other parties that may be involved, the complexity of determining the relative liability among those parties, the uncertainty as to the nature and scope of the investigations and remediation to be conducted, the uncertainty in the application of law and risk assessment, the various choices and costs associated with diverse technologies that may be used in corrective actions at the sites, and the often quite lengthy periods over which eventual remediation may occur. It is possible that technological, regulatory or enforcement developments, the results of additional environmental studies or other factors could change the Company's expectations with respect to future charges and cash outlays, and such changes could be material to the Company's future results of operations, financial condition or cash flows. Nevertheless, the Company does not currently believe that any claims, penalties or costs in addition to the amounts accrued will have a material adverse effect on the Company’s financial position, results of operations or cash flows. In addition, the Company has identified asset retirement obligations for environmental matters that are expected to be addressed at the retirement, disposal, removal or abandonment of existing owned facilities. At September 30, 2020 and 2019, the Company recorded conditional asset retirement obligations for continuing operations of $29 million and $30 million, respectively. Asbestos Matters The Company and certain of its subsidiaries, along with numerous other third parties, are named as defendants in personal injury lawsuits based on alleged exposure to asbestos containing materials. These cases have typically involved product liability claims based primarily on allegations of manufacture, sale or distribution of industrial products that either contained asbestos or were used with asbestos containing components. As of September 30, 2020, the Company's estimated asbestos-related net liability recorded on a discounted basis within the Company's consolidated statements of financial position was $115 million. The net liability within the consolidated statements of financial position was comprised of a liability for pending and future claims and related defense costs of $483 million, of which $49 million was recorded in other current liabilities and $434 million was recorded in other noncurrent liabilities. The Company also maintained separate cash, investments and receivables related to insurance recoveries within the consolidated statements of financial position of $368 million, of which $39 million was recorded in other current assets and $329 million was recorded in other noncurrent assets. Assets included $9 million of cash and $291 million of investments, which have all been designated as restricted. In connection with the recognition of liabilities for asbestos-related matters, the Company records asbestos-related insurance recoveries that are probable; the amount of such recoveries recorded at September 30, 2020 was $68 million. As of September 30, 2019, the Company's estimated asbestos-related net liability recorded on a discounted basis within the Company's consolidated statements of financial position was $141 million. The net liability within the consolidated statements of financial position was comprised of a liability for pending and future claims and related defense costs of $507 million, of which $50 million was recorded in other current liabilities and $457 million was recorded in other noncurrent liabilities. The Company also maintained separate cash, investments and receivables related to insurance recoveries within the consolidated statements of financial position of $366 million, of which $46 million was recorded in other current assets and $320 million was recorded in other noncurrent assets. Assets included $16 million of cash and $273 million of investments, which have all been designated as restricted. In connection with the recognition of liabilities for asbestos-related matters, the Company records asbestos-related insurance recoveries that are probable; the amount of such recoveries recorded at September 30, 2019 was $77 million. The Company's estimate of the liability and corresponding insurance recovery for pending and future claims and defense costs is based on the Company's historical claim experience, and estimates of the number and resolution cost of potential future claims that may be filed and is discounted to present value from 2068 (which is the Company's reasonable best estimate of the actuarially determined time period through which asbestos-related claims will be filed against Company affiliates). Asbestos- related defense costs are included in the asbestos liability. The Company's legal strategy for resolving claims also impacts these estimates. The Company considers various trends and developments in evaluating the period of time (the look-back period) over which historical claim and settlement experience is used to estimate and value claims reasonably projected to be made through 2068. At least annually, the Company assesses the sufficiency of its estimated liability for pending and future claims and defense costs by evaluating actual experience regarding claims filed, settled and dismissed, and amounts paid in settlements. In addition to claims and settlement experience, the Company considers additional quantitative and qualitative factors such as changes in legislation, the legal environment, and the Company's defense strategy. The Company also evaluates the recoverability of its insurance receivable on an annual basis. The Company evaluates all of these factors and determines whether a change in the estimate of its liability for pending and future claims and defense costs or insurance receivable is warranted. The amounts recorded by the Company for asbestos-related liabilities and insurance-related assets are based on the Company's strategies for resolving its asbestos claims, currently available information, and a number of estimates and assumptions. Key variables and assumptions include the number and type of new claims that are filed each year, the average cost of resolution of claims, the identity of defendants, the resolution of coverage issues with insurance carriers, amount of insurance, and the solvency risk with respect to the Company's insurance carriers. Many of these factors are closely linked, such that a change in one variable or assumption will impact one or more of the others, and no single variable or assumption predominately influences the determination of the Company's asbestos-related liabilities and insurance-related assets. Furthermore, predictions with respect to these variables are subject to greater uncertainty in the later portion of the projection period. Other factors that may affect the Company's liability and cash payments for asbestos-related matters include uncertainties surrounding the litigation process from jurisdiction to jurisdiction and from case to case, reforms of state or federal tort legislation and the applicability of insurance policies among subsidiaries. As a result, actual liabilities or insurance recoveries could be significantly higher or lower than those recorded if assumptions used in the Company's calculations vary significantly from actual results. Insurable Liabilities The Company records liabilities for its workers' compensation, product, general and auto liabilities. The determination of these liabilities and related expenses is dependent on claims experience. For most of these liabilities, claims incurred but not yet reported are estimated by utilizing actuarial valuations based upon historical claims experience. At September 30, 2020 and 2019, the insurable liabilities totaled $363 million and $379 million, respectively, of which $83 million and $99 million was recorded within other current liabilities, $22 million and $22 million was recorded within accrued compensation and benefits, and $258 million and $258 million was recorded within other noncurrent liabilities in the consolidated statements of financial position, respectively. The Company records receivables from third party insurers when recovery has been determined to be probable. The amount of such receivables recorded at September 30, 2020 were $21 million, of which $5 million was recorded within other current assets and $16 million was recorded within other noncurrent assets, respectively. The amount of such receivables recorded at September 30, 2019 were $23 million, of which $5 million was recorded within other current assets and $18 million was recorded within other noncurrent assets, respectively. The Company maintains captive insurance companies to manage its insurable liabilities. Aqueous Film-Forming Foam ("AFFF") Litigation Two of the Company's subsidiaries, Chemguard and Tyco Fire Products, have been named, along with other defendant manufacturers, and, in some cases, certain subsidiaries of the Company affiliated with Chemguard and Tyco Fire Products, in a number of class action and other lawsuits relating to the use of fire-fighting foam products by the U.S. Department of Defense (the "DOD") and others for fire suppression purposes and related training exercises. Plaintiffs generally allege that the firefighting foam products manufactured by defendants contain or break down into the chemicals PFOS and PFOA and/or other PFAS compounds and that the use of these products by others at various airbases, airports and other sites resulted in the release of these chemicals into the environment and ultimately into communities’ drinking water supplies neighboring those airports, airbases and other sites. PFOA, PFOS, and other PFAS compounds are being studied by the United States Environmental Protection Agency ("EPA") and other environmental and health agencies and researchers. The EPA has not issued binding regulatory limits, but has stated that it would propose regulatory standards for PFOS and PFOA in drinking water by the end of 2019, in accordance with its PFAS Action Plan released in February 2019, and issued interim recommendations for addressing PFOA and PFOS in groundwater in December 2019. While those studies continue, the EPA has issued a health advisory level for PFOA and PFOS in drinking water. Both PFOA and PFOS are types of synthetic chemical compounds that have been present in firefighting foam. However, both are also present in many existing consumer products. According to EPA, PFOA and PFOS have been used to make carpets, clothing, fabrics for furniture, paper packaging for food and other materials (e.g., cookware) that are resistant to water, grease or stains. Plaintiffs generally seek compensatory damages, including damages for alleged personal injuries, medical monitoring, diminution in property values, investigation and remediation costs, and natural resources damages, and also seek punitive damages and injunctive relief to address remediation of the alleged contamination. In September 2018, Tyco Fire Products and Chemguard filed a Petition for Multidistrict Litigation with the United States Judicial Panel on Multidistrict Litigation (“JPML”) seeking to consolidate all existing and future federal cases into one jurisdiction. On December 7, 2018, the JPML issued an order transferring various AFFF cases to a multi-district litigation (“MDL”) before the United States District Court for the District of South Carolina. Additional cases have been identified for transfer to or are being directly filed in the MDL. AFFF Putative Class Actions Chemguard and Tyco Fire Products are named in 30 putative class actions in federal courts originating from Colorado, Delaware, Florida, Massachusetts, New York, Pennsylvania, Washington, New Hampshire, South Carolina, the District of Columbia, Guam, West Virginia, Michigan and South Dakota. All but one of these cases has been transferred to the MDL, and it is anticipated that the remaining case will be removed to federal court and transferred following service of the complaint. AFFF Individual or Mass Actions There are approximately 746 individual or “mass” actions pending that were filed in state or federal court in California (5 cases), Colorado (41 cases), New York (4 cases), Pennsylvania (15 cases), New Mexico (2 cases), Missouri (1 case), Arizona (1 case), and South Carolina (677 cases direct filed from various U.S. jurisdictions) against Chemguard and Tyco Fire Products and other defendants in which the plaintiffs generally seek compensatory damages, including damages for alleged personal injuries, medical monitoring, and alleged diminution in property values. The cases involve five plaintiffs in California, approximately 7,000 plaintiffs in Colorado, approximately 126 plaintiffs in New York, 15 plaintiffs in Pennsylvania, two plaintiffs in New Mexico, one plaintiff in Missouri, two plaintiffs in Arizona, and more than 500 plaintiffs from various states who direct-filed complaints in South Carolina. All but six of these matters have been transferred to or directly-filed in the MDL, and it is anticipated that the remaining cases will be transferred to the MDL. Many of the additional filed actions were directly filed in South Carolina by plaintiffs who were among the 660 plaintiffs the Company had previously disclosed to have made filings in Pennsylvania state court. The Company anticipates that the remainder of the possible individual product liability claims filed in Pennsylvania state court will either soon be filed in the MDL (and that all such claims in state court will be dismissed accordingly) or will be dismissed in Pennsylvania without a corresponding filing in South Carolina. AFFF Municipal Cases Chemguard and Tyco Fire Products are also defendants in 58 cases in federal and state courts involving municipal or water provider plaintiffs in Alaska, Arizona, California, Colorado, Florida, Massachusetts, New Jersey, New York, Maryland, Ohio, Pennsylvania, Washington, the District of Columbia and several municipalities or water providers from various states who direct-filed complaints in South Carolina. All but three of these cases have been transferred to or directly filed in the MDL, and it is anticipated that the remaining cases will be transferred to the MDL. These municipal plaintiffs generally allege that the use of the defendants’ fire-fighting foam products at fire training academies, municipal airports, Air National Guard bases, or Navy or Air Force bases released PFOS and PFOA into public water supply wells, allegedly requiring remediation of public property. Since the beginning of fiscal year 2021, two municipal actions have been filed against the Company. In May 2018, the Company was also notified by the Widefield Water and Sanitation District in Colorado Springs, Colorado that it may assert claims regarding its remediation costs in connection with PFOS and PFOA contamination allegedly resulting from the use of those products at the Peterson Air Force Base. In May 2020, the Company was also notified by the Lakewood Water District in Pierce County, Washington that it may assert claims regarding remediation in connection with PFOA, PFOS, and other PFAS contamination allegedly resulting from the use of those products at Joint Base Lewis-McChord. State or U.S. Territory Attorneys General Litigation related to AFFF In June 2018, the State of New York filed a lawsuit in New York state court (State of New York v. The 3M Company et al No. 904029-18 (N.Y. Sup. Ct., Albany County)) against a number of manufacturers, including affiliates of the Company, with respect to alleged PFOS and PFOA contamination purportedly resulting from firefighting foams used at locations across New York, including Stewart Air National Guard Base in Newburgh and Gabreski Air National Guard Base in Southampton, Plattsburgh Air Force Base in Plattsburgh, Griffiss Air Force Base in Rome, and unspecified “other” sites throughout the State. The lawsuit seeks to recover costs and natural resource damages associated with contamination at these sites. This suit has been removed to the United States District Court for the Northern District of New York and transferred to the MDL. In February 2019, the State of New York filed a second lawsuit in New York state court (State of New York v. The 3M Company et al (N.Y. Sup. Ct., Albany County)), against a number of manufacturers, including affiliates of the Company, with respect to alleged PFOS and PFOA contamination purportedly resulting from firefighting foams used at additional locations across New York. This suit has been removed to the United States District Court for the Northern District of New York and transferred to the MDL. In July 2019, the State of New York filed a third lawsuit in New York state court ( State of New York v. The 3M Company et al (N.Y. Sup. Ct., Albany County)), against a number of manufacturers, including affiliates of the Company, with respect to alleged PFOS and PFOA contamination purportedly resulting from firefighting foams used at further additional locations across New York. This suit has been removed to the United States District Court for the Northern District of New York and transferred to the MDL. In November 2019, the State of New York filed a fourth lawsuit in New York state court ( State of New York v. The 3M Company et al (N.Y. Sup. Ct., Albany County)), against a number of manufacturers, including affiliates of the Company, with respect to alleged PFOS and PFOA contamination purportedly resulting from firefighting foams used at further additional locations across New York. This suit has been removed to federal court and transferred to the MDL. In January 2019, the State of Ohio filed a lawsuit in Ohio state court (State of Ohio v. The 3M Company et al., No. G-4801-CI-021804752-000 (Court of Common Pleas of Lucas County, Ohio)) against a number of manufacturers, including affiliates of the Company, with respect to PFOS and PFOA contamination allegedly resulting from the use of firefighting foams at various specified and unspecified locations across Ohio. The lawsuit seeks to recover costs and natural resource damages associated with the contamination. This lawsuit has been removed to the United States District Court for the Northern District of Ohio and transferred to the MDL. In addition, in May and June 2019, three other states filed lawsuits in their respective state courts against a number of manufacturers, including affiliates of the Company, with respect to PFOS and PFOA contamination allegedly resulting from the use of firefighting foams at various specified and unspecified locations across their jurisdictions ( State of New Hampshire v. The 3M Company et al. ; State of Vermont v. The 3M Company et al .; State of New Jersey v. The 3M Company et al .). All three of these suits have been removed to federal court and transferred to the MDL. In September 2019, the government of Guam filed a lawsuit in the superior court of Guam against a number of manufacturers, including affiliates of the Company, with respect to PFOS and PFOA contamination allegedly resulting from the use of firefighting foams at various locations within its jurisdiction. This complaint has been removed to federal court and transferred to the MDL. In November 2019, the government of the Commonwealth of the Northern Mariana Islands filed a lawsuit in the superior court of the Northern Mariana Islands against a number of manufacturers, including affiliates of the Company, with respect to PFOS and PFOA contamination allegedly resulting from the use of firefighting foams at various locations within its jurisdiction. This complaint has been removed to federal court and transferred to the MDL. In August 2020, Attorney General of the State of Michigan filed two substantially similar lawsuits—one in federal court and one in state court—against a number of manufacturers, including affiliates of the Company, with respect to PFOS and PFOA contamination allegedly resulting from the use of firefighting foams at various locations within the State. The federal action has been transferred to the MDL, and the state court action has been removed to federal court and tagged for transfer to the MDL. AFFF Matters Related to the Tyco Fire Products Fire Technology Center in Marinette, Wisconsin Tyco Fire Products and Chemguard are defendants in one lawsuit in Marinette County, Wisconsin alleging damages due to the historical use of AFFF products at Tyco’s Fire Technology Center in Marinette, Wisconsin. The putative class action, Joan & Richard Campbell for themselves and on behalf of other similarly situated v. Tyco Fire Products LP and Chemguard Inc., et al. (Marinette County Circuit Court, filed Dec. 17, 2018) alleges PFAS (including PFOA/PFOS) contaminated groundwater migrated off Tyco’s property and into residential drinking water wells causing both personal injuries and property damage to the plaintiffs; Tyco and Chemguard removed this case to the United States District Court for the Eastern District of Wisconsin and it has been transferred to the MDL. A second lawsuit, Duane and Janell Goldsmith individually and on behalf of H.G. and K.G v. Tyco Fire Products LP and Chemguard Inc., et al. (Marinette County Circuit Court, filed Dec. 17, 2018) was also filed by a family alleging personal injuries due to contaminated groundwater; this case has been dismissed without prejudice. Other AFFF Related Matters In March 2020, the Kalispel Tribe of Indians (a federally recognized Tribe) and two tribal corporations filed a lawsuit in the United States District Court for the Eastern District of Washington against a number of manufacturers, including affiliates of the Company, and the United States with respect to PFAS contamination allegedly resulting from the use and disposal of AFFF by the United States Air Force at and around Fairchild Air Force Base in eastern Washington. This case has been transferred to the MDL. Other PFAS Related Matters In April 2020, the Weirton Area Water Board in West Virginia filed a lawsuit in the Circuit Court of Brooke County, West Virginia against a number of PFAS chemical manufacturers, including Chemguard, with respect to PFAS contamination. This case has been removed to the United States District Court for the Northern District of West Virginia. The Company is vigorously defending the above matters and believes that it has meritorious defenses to class certification and the claims asserted, including statutes of limitations, the government contractor defense, various medical and scientific defenses, and other factual and legal defenses. The government contractor defense is a form of immunity available to government contractors that produced products for the United States government pursuant to the government’s specifications. Tyco and Chemguard have insurance that has been in place for many years and the Company is pursuing this coverage for these matters. However, there are numerous factual and legal issues to be resolved in connection with these claims, and it is extremely difficult to predict the outcome or ultimate financial exposure, if any, represented by these matters, and there can be no assurance that any such exposure will not be material. Bosch Litigation On March 15, 2019, a German subsidiary of the Company received a complaint from Robert Bosch GmbH (“Bosch”), filed in a German court. The complaint related to an automotive starter batteries joint venture in which the Company and Bosch were 80/20 parties to this joint venture. At the time the complaint was filed, JCI’s ownership interest in the joint venture was to be transferred to entities controlled by the Purchaser upon consummation of the sale of the Company’s Power Solutions business. The complaint alleged that certain internal Company reorganization transactions were not in compliance with the arrangements relating to such joint venture. On August 8, 2019, Bosch entered into an agreement with Purchaser pursuant to which Purchaser would purchase Bosch’s interest in the joint venture. Simultaneously with this agreement, the Company and Bosch executed an agreement to dismiss the proceedings between the parties upon the completion of Purchaser’s acquisition of Bosch’s interest. In the first quarter of fiscal 2020, following the completion of Purchaser’s acquisition of Bosch’s interest in the joint venture, the Company and Bosch made filings with the German court terminating the litigation. Pursuant to the Company’s obligations to Purchaser in connection with the divestiture of the Company’s Power Solutions business, the Company reimbursed Purchaser a portion of its costs in connection with its acquisition of Bosch’s interests in the joint venture, which was reflected as a cash outflow for discontinued operations. Other Matters

Related Party Transactions (Not

Related Party Transactions (Notes)	12 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	RELATED PARTY TRANSACTIONS In the ordinary course of business, the Company enters into transactions with related parties, such as equity affiliates. Such transactions consist of facility management services, the sale or purchase of goods and other arrangements. The following table presents net sales to and purchases from related parties for the years ended September 30, 2020, 2019, and 2018 (in millions): Year Ended September 30, 2020 2019 2018 Net sales to related parties $ 194 $ 217 $ 220 Purchases from related parties 85 66 63 The following table presents receivables from and payables to related parties in the consolidated statements of financial position (in millions): September 30, 2020 2019 Receivable from related parties $ 48 $ 34 Payable to related parties 11 6

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Sep. 30, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
VALUATION AND QUALIFYING ACCOUNTS	JOHNSON CONTROLS INTERNATIONAL PLC AND SUBSIDIARIES SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (In millions) Year Ended September 30, 2020 2019 2018 Accounts Receivable - Allowance for Doubtful Accounts Balance at beginning of period $ 173 $ 169 $ 172 Provision charged to costs and expenses 20 37 14 Accounts charged off, net of recoveries (21) (21) (17) Acquisition (divestiture) of businesses — (10) — Currency translation 1 (2) — Balance at end of period $ 173 $ 173 $ 169 Deferred Tax Assets - Valuation Allowance Balance at beginning of period $ 5,068 $ 5,088 $ 3,735 Allowance provision for new operating and other loss carryforwards 624 195 1,639 Allowance provision (benefits) (174) (215) (286) Balance at end of period $ 5,518 $ 5,068 $ 5,088

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the consolidated accounts of Johnson Controls International plc and its subsidiaries that are consolidated in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP"). All significant intercompany transactions have been eliminated. The results of companies acquired or disposed of during the year are included in the consolidated financial statements from the effective date of acquisition or up to the date of disposal. Investments in partially-owned affiliates are accounted for by the equity method when the Company’s interest exceeds 20% and the Company does not have a controlling interest. The Company consolidates variable interest entities ("VIE") in which the Company has the power to direct the significant activities of the entity and the obligation to absorb losses or receive benefits from the entity that may be significant. The Company did not have a significant variable interest in any consolidated or nonconsolidated VIEs in its continuing operations for the presented reporting periods.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The fair values of cash and cash equivalents, accounts receivable, short-term debt and accounts payable approximate their carrying values. See Note 10, "Derivative Instruments and Hedging Activities," and Note 11, "Fair Value Measurements," of the notes to consolidated financial statements for fair value of financial instruments, including derivative instruments, hedging activities and long-term debt.
Assets and Liabilities Held for Sale	Assets and Liabilities Held for Sale The Company classifies assets and liabilities (disposal groups) to be sold as held for sale in the period in which all of the following criteria are met: management, having the authority to approve the action, commits to a plan to sell the disposal group; the disposal group is available for immediate sale in its present condition subject only to terms that are usual and customary for sales of such disposal groups; an active program to locate a buyer and other actions required to complete the plan to sell the disposal group have been initiated; the sale of the disposal group is probable, and transfer of the disposal group is expected to qualify for recognition as a completed sale within one year, except if events or circumstances beyond the Company's control extend the period of time required to sell the disposal group beyond one year; the disposal group is being actively marketed for sale at a price that is reasonable in relation to its current fair value; and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. In addition, the Company classifies disposal groups to be disposed of other than by sale (e.g. spin-off) as held for sale in the period the disposal occurs. The Company initially measures a disposal group that is classified as held for sale at the lower of its carrying value or fair value less any costs to sell. Any loss resulting from this measurement is recognized in the period in which the held for sale criteria are met. Conversely, gains are not recognized on the sale of a disposal group until the date of sale. The Company assesses the fair value of a disposal group, less any costs to sell, each reporting period it remains classified as held for sale and reports any subsequent changes as an adjustment to the carrying value of the disposal group, as long as the new carrying value does not exceed the carrying value of the disposal group at the time it was initially classified as held for sale. Upon determining that a disposal group meets the criteria to be classified as held for sale, the Company reports the assets and liabilities of the disposal group, if material, in the line items assets held for sale and liabilities held for sale in the consolidated statements of financial position. Refer to Note 3, "Discontinued Operations," of the notes to consolidated financial statements for further information.
Cash and Cash Equivalents	Cash and Cash EquivalentsThe Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents.
Restricted Cash	Restricted CashAt September 30, 2020 and September 30, 2019, the Company held restricted cash of approximately $9 million and $16 million, respectively all of which was recorded within other current assets in the consolidated statements of financial position. These amounts related to cash restricted for payment of asbestos liabilities.
Receivables	Receivables Receivables consist of amounts billed and currently due from customers and unbilled costs and accrued profits related to revenues on long-term contracts that have been recognized for accounting purposes but not yet billed to customers. The Company extends credit to customers in the normal course of business and maintains an allowance for doubtful accounts resulting from the inability or unwillingness of customers to make required payments. The allowance for doubtful accounts is based on historical experience, existing economic conditions and any specific customer collection issues the Company has identified. The Company enters into supply chain financing programs to sell certain accounts receivable without recourse to third-party financial institutions. Sales of accounts receivable are reflected as a reduction of accounts receivable in the consolidated statements of financial position and the proceeds are included in cash flows from operating activities in the consolidated statements of cash flows.
Inventories	Inventories Inventories are stated at the lower of cost or market using the first-in, first-out ("FIFO") method. Finished goods and work-in-process inventories include material, labor and manufacturing overhead costs.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation is provided over the estimated useful lives of the respective assets using the straight-line method for financial reporting purposes and accelerated methods for income tax purposes. The
Goodwill and Intangible Assets	Goodwill and Indefinite-Lived Intangible Assets Goodwill reflects the cost of an acquisition in excess of the fair values assigned to identifiable net assets acquired. The Company reviews goodwill for impairment during the fourth fiscal quarter or more frequently if events or changes in circumstances indicate the asset might be impaired. The Company performs impairment reviews for its reporting units, which have been determined to be the Company’s reportable segments or one level below the reportable segments in certain instances, using a fair value method based on management’s judgments and assumptions or third party valuations. The fair value of a reporting unit refers to the price that would be received to sell the unit as a whole in an orderly transaction between market participants at the measurement date. In estimating the fair value, the Company uses multiples of earnings based on the average of published multiples of earnings of comparable entities with similar operations and economic characteristics and applies the multiples to the Company's average of historical and future financial results for each reporting unit. In certain instances, the Company uses discounted cash flow analyses or estimated sales price to further support the fair value estimates. The inputs utilized in the analyses are classified as Level 3 inputs within the fair value hierarchy as defined in ASC 820, "Fair Value Measurement." The estimated fair value is then compared with the carrying amount of the reporting unit, including recorded goodwill. The Company is subject to financial statement risk to the extent that the carrying amount exceeds the estimated fair value. Refer to Note 7, "Goodwill and Other Intangible Assets," of the notes to consolidated financial statements for information regarding the goodwill impairment testing performed in fiscal years 2020, 2019 and 2018.
Lessee, Leases	Leases Lessee arrangements The Company leases certain administrative, production and other facilities, fleet vehicles, information technology equipment and other equipment under arrangements that are accounted for as operating leases. The Company determines whether an arrangement contains a lease at contract inception based on whether the arrangement involves the use of a physically distinct identified asset and whether the Company has the right to obtain substantially all of the economic benefits from the use of the asset throughout the period as well as the right to direct the use of the asset. Right-of-use assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. Right-of-use assets and the corresponding lease liabilities are recognized at commencement date based on the present value of lease payments for all leases with terms longer than twelve months. As the majority of the Company's leases do not provide an implicit interest rate, to determine the present value of lease payments, the Company uses its incremental borrowing rate based on information available on the lease commencement date and uses the implicit rate when readily determinable. The Company determines its incremental borrowing rate based on a comparable market yield curve consistent with the Company's credit rating, term of the lease and relative economic environment. The Company has elected to combine lease and nonlease components for its leases.
Lessor, Leases	Lessor arrangements The Company's monitoring services and maintenance agreements within its security business that include subscriber system assets for which the Company retains ownership contain both lease and nonlease components. The Company has elected the practical expedient to combine lease and nonlease components for these arrangements where the timing and pattern of transfer of the lease and nonlease components are the same and the lease component would be classified as an operating lease if accounted for separately. The Company has concluded that in these arrangements the nonlease components are the predominant characteristic, and as a result, the combined component is accounted for under the revenue guidance.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews long-lived assets, including right-of-use assets under operating leases, other tangible assets and intangible assets with definitive lives, for impairment whenever events or changes in circumstances indicate that the asset’s carrying amount may not be recoverable. The Company conducts its long-lived asset impairment analyses in accordance with ASC 360-10-15, "Impairment or Disposal of Long-Lived Assets," ASC 350-30, "General Intangibles Other than Goodwill" and ASC 985-20, "Costs of Software to be Sold, Leased, or Marketed." The Company groups assets and liabilities at the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities and evaluates the asset group against the sum of the undiscounted future cash flows. If the undiscounted cash flows do not indicate the carrying amount of the asset group is recoverable, an impairment charge is measured as the amount by which the carrying amount of the asset group exceeds its fair value based on discounted cash flow analysis or appraisals. Intangible assets acquired in a business combination that are used in research and development activities are considered indefinite-lived until the completion or abandonment of the associated research and development efforts. During the period that those assets are considered indefinite lived, they are not amortized but are tested for impairment annually and more frequently if events or changes in circumstances indicate that it is more likely than not that the asset is impaired. If the carrying amount of an intangible asset exceeds its fair value, the Company recognizes an impairment loss in an amount equal to that excess. Unamortized capitalized costs of a computer software product are compared to the net realizable value of the product. The amount by which the unamortized capitalized costs of a computer software product exceed the net realizable value of that asset is written off. Refer to Note 17, "Impairment of Long-Lived Assets," of the notes to consolidated financial statements for information regarding the impairment testing performed in fiscal years 2020, 2019 and 2018.
Revenue Recognition	Revenue Recognition The Company recognizes revenue from certain long-term contracts to design, manufacture and install building products and systems as well as unscheduled repair or replacement services on an over time basis, with progress towards completion measured using a cost-to-cost input method based on the relationship between actual costs incurred and total estimated costs at completion. The cost-to-cost input method is used as it best depicts the transfer of control to the customer that occurs as the Company incurs costs. Changes to the original estimates may be required during the life of the contract and such estimates are reviewed monthly. If contract modifications result in additional goods or services that are distinct from those transferred before the modification, they are accounted for prospectively as if the Company entered into a new contract. If the goods or services in the modification are not distinct from those in the original contract, sales and gross profit are adjusted using the cumulative catch-up method for revisions in estimated total contract costs and contract values. Estimated losses are recorded when identified. The Company does not adjust the promised amount of consideration for the effects of a significant financing component as at contract inception the Company expects to receive the payment within twelve months of transfer of goods or services. The Company enters into extended warranties and long-term service and maintenance agreements with certain customers. For these arrangements, revenue is recognized over time on a straight-line basis over the respective contract term. The Company also sells certain HVAC and refrigeration products and services in bundled arrangements with multiple performance obligations, such as equipment, commissioning, service labor and extended warranties. Approximately four to twelve months separate the timing of the first deliverable until the last piece of equipment is delivered, and there may be extended warranty arrangements with duration of one to five years commencing upon the end of the standard warranty period. In addition, the Company sells security monitoring systems that may have multiple performance obligations, including equipment, installation, monitoring services and maintenance agreements. Revenues associated with sale of equipment and related installations are recognized over time on a cost-to-cost input method, while the revenue for monitoring and maintenance services are recognized over time as services are rendered. The transaction price is allocated to each performance obligation based on the relative selling price method. In order to estimate relative selling price, market data and transfer price studies are utilized. If the standalone selling price is not directly observable, the Company estimates the standalone selling price using an adjusted market assessment approach or expected cost plus margin approach. For transactions in which the Company retains ownership of the subscriber system asset, fees for monitoring and maintenance services are recognized over time on a straight-line basis over the contract term. Non-refundable fees received in connection with the initiation of a monitoring contract, along with associated direct and incremental selling costs, are deferred and amortized over the estimated life of the contract. In all other cases, the Company recognizes revenue at the point in time when control over the goods or services transfers to the customer. The Company considers the contractual consideration payable by the customer and assesses variable consideration that may affect the total transaction price, including discounts, rebates, refunds, credits or other similar sources of variable consideration, when determining the transaction price of each contract. The Company includes variable consideration in the estimated transaction price when it is probable that significant reversal of revenue recognized would not occur when the uncertainty associated with variable consideration is subsequently resolved. These estimates are based on the amount of consideration that the Company expects to be entitled to. Shipping and handling costs billed to customers are included in sales and the related costs are included in cost of sales when control transfers to the customer. The Company presents amounts collected from customers for sales and other taxes net of the related amounts remitted.
Subscriber System Assets, Dealer Intangibles and Related Deferred Revenue Accounts	Subscriber System Assets, Dealer Intangibles and Related Deferred Revenue Accounts The Company considers assets related to the acquisition of new customers in its electronic security business in three asset categories: internally generated residential subscriber systems outside of North America, internally generated commercial subscriber systems (collectively referred to as subscriber system assets) and customer accounts acquired through the ADT dealer program, primarily outside of North America (referred to as dealer intangibles). Subscriber system assets include installed property, plant and equipment for which the Company retains ownership and deferred costs directly related to the customer acquisition and system installation. Subscriber system assets represent capitalized equipment (e.g. security control panels, touch pad, motion detectors, window sensors, and other equipment) and installation costs associated with electronic security monitoring arrangements under which the Company retains ownership of the security system assets in a customer's place of business, or outside of North America, residence. Installation costs represent costs incurred to prepare the asset for its intended use. The Company pays property taxes on the subscriber system assets and upon customer termination, may retrieve such assets. These assets embody a probable future economic benefit as they generate future monitoring revenue for the Company. Costs related to the subscriber system equipment and installation are categorized as property, plant and equipment rather than deferred costs. Deferred costs associated with subscriber system assets represent direct and incremental selling expenses (such as commissions) related to acquiring the customer. Commissions related to up-front consideration paid by customers in connection with the establishment of the monitoring arrangement are determined based on a percentage of the up-front fees and do not exceed deferred revenue. Such deferred costs are recorded as other current and noncurrent assets within the consolidated statements of financial position. Subscriber system assets and any deferred revenue resulting from the customer acquisition are accounted for over the expected life of the subscriber. In certain geographical areas where the Company has a large number of customers that behave in a similar manner over time, the Company accounts for subscriber system assets and related deferred revenue using pools, with separate pools for the components of subscriber system assets and any related deferred revenue based on the same month and year of acquisition. The Company depreciates its pooled subscriber system assets and related deferred revenue using a straight-line method with lives up to 12 years and considering customer attrition. The Company uses a straight-line method with a 15-year life for non-pooled subscriber system assets (primarily in Europe, Latin America and Asia) and related deferred revenue, with remaining balances written off upon customer termination. Certain contracts and related customer relationships result from purchasing residential security monitoring contracts from an external network of independent dealers who operate under the ADT dealer program, primarily outside of North America. Acquired contracts and related customer relationships are recorded at their contractually determined purchase price. During the first 6 months (12 months in certain circumstances) after the purchase of the customer contract, any cancellation of monitoring service, including those that result from customer payment delinquencies, results in a chargeback by the Company to the dealer for the full amount of the contract purchase price. The Company records the amount charged back to the dealer as a reduction of the previously recorded intangible asset.
Research and Development Costs	Research and Development Costs Expenditures for research activities relating to product development and improvement are charged against income as incurred and included within selling, general and administrative expenses for continuing operations in the consolidated statements of
Earnings Per Share	Earnings Per Share The Company presents both basic and diluted earnings per share ("EPS") amounts. Basic EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of common shares outstanding during the reporting period. Diluted EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of common shares and common equivalent shares outstanding during the reporting period that are calculated using the treasury stock method for stock options, unvested restricted stock and unvested performance share awards. See Note 13, "Earnings per Share," of the notes to consolidated financial statements for the calculation of earnings per share.
Foreign Currency Translation	Foreign Currency Translation Substantially all of the Company’s international operations use the respective local currency as the functional currency. Assets and liabilities of international entities have been translated at period-end exchange rates, and income and expenses have been translated using average exchange rates for the period. Monetary assets and liabilities denominated in non-functional currencies are adjusted to reflect period-end exchange rates. The aggregate transaction gains (losses), net of the impact of foreign currency hedges, included in income from continuing operations for the years ended September 30, 2020, 2019 and 2018 were $(32) million, $(10) million and $1 million, respectively.
Derivative Financial Instruments	Derivative Financial Instruments The Company has written policies and procedures that place all financial instruments under the direction of Corporate treasury and restrict all derivative transactions to those intended for hedging purposes. The use of financial instruments for speculative purposes is strictly prohibited. The Company selectively uses financial instruments to manage the market risk from changes in foreign exchange rates, commodity prices, stock-based compensation liabilities and interest rates. The fair values of all derivatives are recorded in the consolidated statements of financial position. The change in a derivative’s fair value is recorded each period in current earnings or accumulated other comprehensive income ("AOCI"), depending on whether the derivative is designated as part of a hedge transaction and if so, the type of hedge transaction. See Note 10, "Derivative Instruments and Hedging Activities," and Note 11, "Fair Value Measurements," of the notes to consolidated financial statements for disclosure of the Company’s derivative instruments and hedging activities.
Investments	InvestmentsThe Company invests in debt and equity securities which are marked to market at the end of each accounting period. For fiscal 2020 and 2019, unrealized gains and losses on these securities are recognized in the Company's consolidated statements of income. For periods prior to fiscal 2019, the unrealized gains and losses on these securities, other than the deferred compensation plan assets, were recognized in AOCI within the consolidated statement of shareholders' equity unless an unrealized loss is deemed to be other than temporary, in which case such loss was charged to earnings. The deferred compensation plan assets are marked to market at the end of each accounting period and all unrealized gains and losses are recorded in the consolidated statements of income.
Pension and Postretirement Benefits	Pension and Postretirement Benefits The Company utilizes a mark-to-market approach for recognizing pension and postretirement benefit expenses, including measuring the market related value of plan assets at fair value and recognizing actuarial gains and losses in the fourth quarter of each fiscal year or at the date of a remeasurement event. Refer to Note 15, "Retirement Plans," of the notes to consolidated financial statements for disclosure of the Company's pension and postretirement benefit plans.
Loss Contingencies	Loss Contingencies Accruals are recorded for various contingencies including legal proceedings, environmental matters, self-insurance and other claims that arise in the normal course of business. The accruals are based on judgment, the probability of losses and, where applicable, the consideration of opinions of internal and/or external legal counsel and actuarially determined estimates. Additionally, the Company records receivables from third party insurers when recovery has been determined to be probable. The Company is subject to laws and regulations relating to protecting the environment. The Company provides for expenses associated with environmental remediation obligations when such amounts are probable and can be reasonably estimated. Refer to Note 22, "Commitments and Contingencies," of the notes to consolidated financial statements. The Company records liabilities for its workers' compensation, product, general and auto liabilities. The determination of these liabilities and related expenses is dependent on claims experience. For most of these liabilities, claims incurred but not yet reported are estimated by utilizing actuarial valuations based upon historical claims experience. The Company records receivables from third party insurers when recovery has been determined to be probable. The Company maintains captive insurance companies to manage its insurable liabilities. Asbestos-Related Contingencies and Insurance Receivables The Company and certain of its subsidiaries along with numerous other companies are named as defendants in personal injury lawsuits based on alleged exposure to asbestos-containing materials. The Company's estimate of the liability and corresponding insurance recovery for pending and future claims and defense costs is based on the Company's historical claim experience, and estimates of the number and resolution cost of potential future claims that may be filed and is discounted to present value from 2068 (which is the Company's reasonable best estimate of the actuarially determined time period through which asbestos-related claims will be filed against Company affiliates). Asbestos-related defense costs are included in the asbestos liability. The Company's legal strategy for resolving claims also impacts these estimates. The Company considers various trends and developments in evaluating the period of time (the look-back period) over which historical claim and settlement experience is used to estimate and value claims reasonably projected to be made through 2068. Annually, the Company assesses the sufficiency of its estimated liability for pending and future claims and defense costs by evaluating actual experience regarding claims filed, settled and dismissed, and amounts paid in settlements. In addition to claims and settlement experience, the Company considers additional quantitative and qualitative factors such as changes in legislation, the legal environment, and the Company's defense strategy. The Company also evaluates the recoverability of its insurance receivable on an annual basis. The Company evaluates all of these factors and determines whether a change in the estimate of its liability for pending and future claims and defense costs or insurance receivable is warranted. In connection with the recognition of liabilities for asbestos-related matters, the Company records asbestos-related insurance recoveries that are probable. The Company's estimate of asbestos-related insurance recoveries represents estimated amounts due to the Company for previously paid and settled claims and the probable reimbursements relating to its estimated liability for pending and future claims discounted to present value. In determining the amount of insurance recoverable, the Company considers available insurance, allocation methodologies, solvency and creditworthiness of the insurers. Refer to Note 22, "Commitments and Contingencies," of the notes to consolidated financial statements for a discussion on management's judgments applied in the recognition and measurement of asbestos-related assets and liabilities.
Income Taxes	Income Taxes Deferred tax liabilities and assets are recognized for the expected future tax consequences of events that have been reflected in the consolidated financial statements. Deferred tax liabilities and assets are determined based on the differences between the book and tax basis of particular assets and liabilities and operating loss carryforwards, using tax rates in effect for the years in which the differences are expected to reverse. A valuation allowance is provided to reduce the carrying or book value of deferred tax assets if, based upon the available evidence, including consideration of tax planning strategies, it is more-likely-than-not that some or all of the deferred tax assets will not be realized. Refer to Note 18, "Income Taxes," of the notes to consolidated financial statements.
Retrospective Changes	Retrospective Changes Certain amounts as of September 30, 2019 and 2018 have been revised to conform to the current year's presentation.
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)." ASU No. 2016-02 requires recognition of operating leases as lease assets and liabilities on the balance sheet, and disclosure of key information about leasing arrangements. The Company adopted Topic 842 and the related amendments using a modified-retrospective approach as of October 1, 2019 and applied the new guidance to all leases through a cumulative-effect adjustment to beginning retained earnings. The comparative periods have not been recast and continue to be reported under the previous lease accounting guidance. The Company has elected to apply the package of transitional practical expedients, under which the Company did not reassess prior conclusions about lease identification, lease classification, and initial direct costs of existing leases as of the date of adoption. The adoption of the new guidance resulted in recognition of a right-of-use asset and related lease liabilities of $1.1 billion, with an immaterial impact to retained earnings. Refer to Note 8, “Leases,” for additional lease disclosures. In May 2020, the SEC issued Final Rule Release No. 33-10786, which amends the financial statement requirements for acquisitions and dispositions of businesses and related pro forma financial information required under SEC Regulation S-X, Rule 3-05. Among other things, the final rule modifies the significance test required in SEC Regulation S-X, Rule 1-02(w) by changing the income test to use the lower measure of significance based on income from continuing operations before taxes or revenue. In accordance with Rules 3-09 or 4-08(g), the revised income test will apply to the evaluation of equity method investments for significance. The final rule is effective on January 1, 2021, however, voluntary early adoption is permitted as long as all amendments are adopted in their entirety. The Company early adopted all provisions of the final rule during the fourth quarter of fiscal 2020. As a result of the revised income test, none of the Company’s non-consolidated partially-owned affiliates, either individually or in the aggregate, are considered significant subsidiaries which require disclosure in the Company’s footnotes for fiscal 2020. Recently issued accounting pronouncements are not expected to have a material impact on the Company's consolidated financial statements.

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Sep. 30, 2020
Discontinued Operations, Disposed of by Sale [Member] | Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operations by Disposal Group	The following table summarizes the results of Power Solutions which are classified as discontinued operations for the fiscal years ended September 30, 2019 and 2018 (in millions). As the Power Solutions sale occurred on April 30, 2019, there are only seven months of results included in the fiscal year ended September 30, 2019. Year Ended September 30, 2019 2018 Net sales $ 5,001 $ 8,000 Income from discontinued operations before income taxes 6,039 1,355 Provision for income taxes on discontinued operations (1,441) (321) Income from discontinued operations attributable to noncontrolling interests, net of tax (24) (47) Income from discontinued operations $ 4,574 $ 987

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following table presents the Company's revenues disaggregated by segment and by products and systems versus services revenue for the years ended September 30, 2020 and 2019 (in millions): Year Ended September 30, 2020 Year Ended September 30, 2019 Products & Systems Services Total Products & Systems Services Total Building Solutions North America $ 5,371 $ 3,234 $ 8,605 $ 5,745 $ 3,286 $ 9,031 Building Solutions EMEA/LA 1,644 1,796 3,440 1,767 1,888 3,655 Building Solutions Asia Pacific 1,369 1,034 2,403 1,575 1,083 2,658 Global Products 7,869 — 7,869 8,624 — 8,624 Total $ 16,253 $ 6,064 $ 22,317 $ 17,711 $ 6,257 $ 23,968 The following table presents further disaggregation of Global Products segment revenues by product type for the years ended September 30, 2020 and 2019 (in millions): Year Ended Year Ended September 30, 2019 Building management systems $ 1,205 $ 1,292 HVAC & refrigeration equipment 5,613 6,181 Specialty products 1,051 1,151 Total $ 7,869 $ 8,624
Contract with Customer, Asset and Liability	The following table presents the location and amount of contract balances in the Company's consolidated statements of financial position (in millions): Location of contract balances September 30, 2020 September 30, 2019 Contract assets - current Accounts receivable - net $ 1,395 $ 1,389 Contract assets - noncurrent Other noncurrent assets 104 90 Contract liabilities - current Deferred revenue (1,435) (1,407) Contract liabilities - noncurrent Other noncurrent liabilities (245) (228) Total $ (181) $ (156)

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories consisted of the following (in millions): September 30, 2020 2019 Raw materials and supplies $ 629 $ 588 Work-in-process 142 176 Finished goods 1,002 1,050 Inventories $ 1,773 $ 1,814

Property, Plant and Equipment_2

Property, Plant and Equipment (Tables)	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consisted of the following (in millions): September 30, 2020 2019 Buildings and improvements $ 1,351 $ 1,499 Subscriber systems 679 661 Machinery and equipment 3,332 2,969 Construction in progress 327 465 Land 241 250 Total property, plant and equipment 5,930 5,844 Less: accumulated depreciation (2,871) (2,496) Property, plant and equipment - net $ 3,059 $ 3,348

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill in each of the Company’s reportable segments for the fiscal years ended September 30, 2020 and 2019 were as follows (in millions): September 30, 2018 Business Business Impairments Currency Translation September 30, Building Solutions North America $ 9,603 $ — $ — $ — $ (15) $ 9,588 Building Solutions EMEA/LA 1,950 6 (1) — (106) 1,849 Building Solutions Asia Pacific 1,235 8 — — (49) 1,194 Global Products 5,593 11 (22) — (35) 5,547 Total $ 18,381 $ 25 $ (23) $ — $ (205) $ 18,178 September 30, Business Business Impairments Currency Translation September 30, Building Solutions North America $ 9,588 $ — $ — $ (424) $ (4) $ 9,160 Building Solutions EMEA/LA 1,849 35 — — 83 1,967 Building Solutions Asia Pacific 1,194 — (11) — 43 1,226 Global Products 5,547 21 — — 11 5,579 Total $ 18,178 $ 56 $ (11) $ (424) $ 133 $ 17,932
Other Intangible Assets	The Company’s other intangible assets, primarily from business acquisitions valued based on independent appraisals, consisted of (in millions): September 30, 2020 September 30, 2019 Gross Accumulated Net Gross Accumulated Net Amortized intangible assets Technology $ 1,332 $ (497) $ 835 $ 1,307 $ (370) $ 937 Customer relationships 2,773 (969) 1,804 2,722 (759) 1,963 Miscellaneous 657 (268) 389 584 (224) 360 Total amortized intangible assets 4,762 (1,734) 3,028 4,613 (1,353) 3,260 Unamortized intangible assets Trademarks/tradenames 2,248 — 2,248 2,282 — 2,282 Miscellaneous 80 — 80 90 — 90 2,328 — 2,328 2,372 — 2,372 Total intangible assets $ 7,090 $ (1,734) $ 5,356 $ 6,985 $ (1,353) $ 5,632

Leases (Tables)

Leases (Tables)	12 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Lease, Cost	The following table presents the Company’s lease costs for the fiscal year ended September 30, 2020 (in millions): Year Ended Operating lease cost $ 399 Variable lease cost 145 Total lease costs $ 544
Supplemental Balance Sheet Information, Leases	The following table presents supplemental consolidated statement of financial position information as of September 30, 2020 (in millions): Location of lease balances September 30, 2020 Operating lease right-of-use assets Other noncurrent assets $ 1,190 Operating lease liabilities - current Other current liabilities 332 Operating lease liabilities - noncurrent Other noncurrent liabilities 875 Weighted-average remaining lease term 6 years Weighted-average discount rate 2.2 %
Supplemental Cash Flow Information, Leases	The following table presents supplemental cash flow information related to operating leases for the fiscal year ended September 30, 2020 (in millions): Year Ended Cash paid for amounts included in the measurement of lease liability: Operating cash outflows from operating leases $ 397 Noncash operating lease activity: Right-of-use assets obtained in exchange for operating lease liabilities 467
Lessee, Operating Lease, Liability, Maturity	The following table presents maturities of operating lease liabilities as of September 30, 2020 (in millions): September 30, 2020 2021 $ 352 2022 279 2023 191 2024 143 2025 91 After 2025 235 Total operating lease payments 1,291 Less: interest (84) Present value of lease payments $ 1,207
Schedule of Future Minimum Rental Payments for Operating Leases	As previously disclosed in the Company's Annual Report on Form 10-K for the year ended September 30, 2019 and accounted for under the previous lease accounting guidance, future minimum operating lease payments for long-term noncancellable operating leases as of September 30, 2019 were as follows (in millions): September 30, 2019 2020 $ 352 2021 287 2022 200 2023 111 2024 71 After 2024 172 Total minimum lease payments $ 1,193

Debt and Financing Arrangemen_2

Debt and Financing Arrangements (Tables)	12 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Short-Term Debt	Short-term debt consisted of the following (in millions): September 30, 2020 2019 Bank borrowings $ 31 $ 10 Weighted average interest rate on short-term debt outstanding 3.4 % 2.0 %
Long-Term Debt	Long-term debt consisted of the following (in millions; due dates by fiscal year): September 30, 2020 2019 Unsecured notes JCI plc - 5.00% due in 2020 ($453 million par value) $ — $ 453 JCI Inc. - 5.00% due in 2020 ($47 million par value) — 47 JCI plc - 0.00% due in 2021 (€750 million par value) — 818 JCI plc - 4.25% due in 2021 ($204 million par value) 204 204 JCI Inc. - 4.25% due in 2021 ($53 million par value) 53 53 JCI plc - 3.75% due in 2022 ($171 million par value) 171 171 JCI Inc. - 3.75% due in 2022 ($22 million par value) 22 22 JCI plc - 4.625% due in 2023 ($25 million par value) 26 26 Tyco International Finance S.A. ("TIFSA") - 4.625% due in 2023 ($7 million par value) 7 7 JCI plc - 1.00% due in 2023 (€888 million par value) 1,039 967 JCI plc - 3.625% due in 2024 ($453 million par value) 453 453 JCI Inc. - 3.625% due in 2024 ($31 million par value) 31 31 JCI plc - 1.375% due in 2025 (€423 million par value) 503 471 TIFSA - 1.375% due in 2025 (€54 million par value) 64 60 JCI plc - 3.90% due in 2026 ($487 million par value) 516 521 TIFSA - 3.90% due in 2026 ($51 million par value) 51 51 JCI plc and Tyco Fire & Security Finance S.C.A. ("TFSCA") - 0.375% due in 2027 (€500 million par value) 583 — JCI plc and TFSCA - 1.75% due in 2030 ($625 million par value) 623 — JCI plc and TFSCA - 1.00% due in 2032 (€500 million par value) 584 — JCI plc - 6.00% due in 2036 ($342 million par value) 339 339 JCI Inc. - 6.00% due in 2036 ($8 million par value) 8 8 JCI plc - 5.70% due in 2041 ($190 million par value) 189 189 JCI Inc. - 5.70% due in 2041 ($30 million par value) 30 30 JCI plc - 5.25% due in 2042 ($155 million par value) 155 155 JCI Inc. - 5.25% due in 2042 ($6 million par value) 6 6 JCI plc - 4.625% due in 2044 ($444 million par value) 441 441 JCI Inc. - 4.625% due in 2044 ($6 million par value) 6 6 JCI plc - 5.125% due in 2045 ($477 million par value) 564 567 TIFSA - 5.125% due in 2045 ($23 million par value) 22 22 JCI plc - 6.95% due in 2046 ($32 million par value) 32 32 JCI Inc. - 6.95% due in 2046 ($4 million par value) 4 4 JCI plc - 4.50% due in 2047 ($500 million par value) 496 496 JCI plc - 4.95% due in 2064 ($341 million par value) 340 340 JCI Inc. - 4.95% due in 2064 ($15 million par value) 15 15 JCI plc - Term Loan - ¥25 billion; LIBOR JPY plus 0.40% due in 2022 237 232 Other 8 3 Gross long-term debt 7,822 7,240 Less: current portion 262 501 Less: debt issuance costs 34 31 Net long-term debt $ 7,526 $ 6,708
Components Of Net Financing Charges	The Company's net financing charges line item in the consolidated statements of income for the years ended September 30, 2020, 2019 and 2018 contained the following components (in millions): Year Ended September 30, 2020 2019 2018 Interest expense, net of capitalized interest costs $ 240 $ 335 $ 409 Banking fees and bond cost amortization 26 28 30 Loss on debt extinguishment — 60 — Interest income (23) (61) (13) Net foreign exchange results for financing activities (12) (12) (25) Net financing charges $ 231 $ 350 $ 401

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Outstanding Commodity Hedge Contracts	The Company had the following outstanding contracts to hedge forecasted commodity purchases (in metric tons): Volume Outstanding as of Commodity September 30, 2020 September 30, 2019 Copper 2,497 3,561 Aluminum 3,036 2,967
Location and Fair Values of Derivative Instruments and Hedging Activities	The following table presents the location and fair values of derivative instruments and hedging activities included in the Company’s consolidated statements of financial position (in millions): Derivatives and Hedging Activities Derivatives and Hedging Activities Not September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Other current assets Foreign currency exchange derivatives $ 10 $ 16 $ 17 $ 19 Commodity derivatives 2 — — — Other noncurrent assets Equity swap — — 58 62 Total assets $ 12 $ 16 $ 75 $ 81 Other current liabilities Foreign currency exchange derivatives $ 10 $ 23 $ — $ — Commodity derivatives — 1 — — Long-term debt Foreign currency denominated debt 3,010 2,544 — — Total liabilities $ 3,020 $ 2,568 $ — $ —
Derivative Assets and Liabilities, Eligible for Offsetting	The gross and net amounts of derivative assets and liabilities were as follows (in millions): Fair Value of Assets Fair Value of Liabilities September 30, 2020 September 30, 2019 September 30, 2020 September 30, 2019 Gross amount recognized $ 87 $ 97 $ 3,020 $ 2,568 Gross amount eligible for offsetting (10) (11) (10) (11) Net amount $ 77 $ 86 $ 3,010 $ 2,557
Location and Amount of Gains and Losses Gross of Tax on Derivative Instruments and Related Hedge Items	The following table presents the pre-tax gains (losses) recorded in other comprehensive income (loss) related to cash flow hedges for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives in ASC 815 Cash Flow Hedging Relationships Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives $ 1 $ 2 $ 2 Commodity derivatives 6 (4) (14) Total $ 7 $ (2) $ (12) The following table presents the location and amount of the pre-tax gains (losses) on cash flow hedges reclassified from AOCI into the Company’s consolidated statements of income for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives in ASC 815 Cash Flow Location of Gain (Loss) Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives Cost of sales $ (5) $ 4 $ 2 Foreign currency exchange derivatives Income from discontinued operations — — 2 Commodity derivatives Cost of sales 2 (4) 5 Commodity derivatives Income from discontinued operations — (10) 7 Total $ (3) $ (10) $ 16 The following table presents the location and amount of pre-tax gains (losses) on derivatives not designated as hedging instruments recognized in the Company’s consolidated statements of income for the fiscal years ended September 30, 2020, 2019 and 2018 (in millions): Derivatives Not Designated as Hedging Instruments under ASC 815 Location of Gain (Loss) Year Ended September 30, 2020 2019 2018 Foreign currency exchange derivatives Cost of sales $ (1) $ (8) $ 4 Foreign currency exchange derivatives Net financing charges 87 (60) 42 Foreign currency exchange derivatives Income tax provision — (1) (4) Foreign currency exchange derivatives Income from discontinued operations — 52 (7) Equity swap Selling, general and administrative (4) 14 (8) Total $ 82 $ (3) $ 27

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets and Liabilities Measured at Fair Value	The following tables present the Company’s fair value hierarchy for those assets and liabilities measured at fair value as of September 30, 2020 and 2019 (in millions): Fair Value Measurements Using: Total as of September 30, 2020 Quoted Prices Significant Significant Other current assets Foreign currency exchange derivatives $ 27 $ — $ 27 $ — Exchange traded funds (fixed income) 1 19 19 — — Commodity derivatives 2 — 2 — Other noncurrent assets Deferred compensation plan assets 63 63 — — Exchange traded funds (fixed income) 1 143 143 — — Exchange traded funds (equity) 1 129 129 — — Equity swap 58 — 58 — Total assets $ 441 $ 354 $ 87 $ — Other current liabilities Foreign currency exchange derivatives $ 10 $ — $ 10 $ — Total liabilities $ 10 $ — $ 10 $ — Fair Value Measurements Using: Total as of September 30, 2019 Quoted Prices Significant Significant Other current assets Foreign currency exchange derivatives $ 35 $ — $ 35 $ — Exchange traded funds (fixed income) 1 19 19 — — Other noncurrent assets Deferred compensation plan assets 71 71 — — Exchange traded funds (fixed income) 1 138 138 — — Exchange traded funds (equity) 1 116 116 — — Equity swap 62 — 62 — Total assets $ 441 $ 344 $ 97 $ — Other current liabilities Foreign currency exchange derivatives $ 23 $ — $ 23 $ — Commodity derivatives 1 — 1 — Total liabilities $ 24 $ — $ 24 $ — 1 Classified as restricted investments for payment of asbestos liabilities. See Note 22, "Commitments and Contingencies" of the notes to consolidated financial statements for further details.
Debt Securities, Trading, and Equity Securities, FV-NI	The following table presents the portion of unrealized gains (losses) recognized in the consolidated statements of income for the years ended September 30, 2020 and 2019 that relate to equity securities still held at September 30, 2020 and 2019 (in millions): Year Ended 2020 2019 Deferred compensation plan assets $ 1 $ (2) Investments in exchange traded funds 21 12

Stock-based Compensation (Table

Stock-based Compensation (Tables)	12 Months Ended
	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumptions Used in Black-Scholes Option Valuation Model	Year Ended September 30, 2020 2019 2018 Expected life of option (years) 6.5 6.4 6.5 Risk-free interest rate 1.67% 2.77% 2.28% Expected volatility of the Company’s stock 22.40% 21.80% 23.70% Expected dividend yield on the Company’s stock 2.49% 3.29% 2.78%
Summary of Stock Option Activity	A summary of stock option activity at September 30, 2020, and changes for the year then ended, is presented below: Weighted Shares Weighted Aggregate Outstanding, September 30, 2019 $ 35.07 12,369,749 Granted 41.67 1,347,310 Exercised 28.80 (2,504,516) Forfeited or expired 38.30 (1,097,638) Outstanding, September 30, 2020 $ 37.14 10,114,905 4.9 $ 46 Exercisable, September 30, 2020 $ 36.98 7,473,203 3.6 $ 36
Assumptions Used in Black-Scholes Stock Appreciation Rights Valuation Model	The assumptions used to determine the fair value of the SAR awards at September 30, 2020 were as follows: Expected life of SAR (years) 0.4 - 2.5 Risk-free interest rate 0.11% - 0.18% Expected volatility of the Company’s stock 22.40% Expected dividend yield on the Company’s stock 2.49%
Summary of Stock Appreciation Rights Activity	A summary of SAR activity at September 30, 2020, and changes for the year then ended, is presented below: Weighted Shares Weighted Aggregate Outstanding, September 30, 2019 $ 28.67 368,009 Exercised 26.88 (129,277) Forfeited or expired 25.47 (26,095) Outstanding, September 30, 2020 $ 30.14 212,637 1.8 $ 2 Exercisable, September 30, 2020 $ 30.14 212,637 1.8 $ 2
Summary of Nonvested Restricted Stock Awards	A summary of non-vested restricted stock awards at September 30, 2020, and changes for the fiscal year then ended, is presented below: Weighted Shares/Units Non-vested, September 30, 2019 $ 35.98 3,333,076 Granted 41.38 2,053,292 Vested 37.39 (1,634,306) Forfeited 37.47 (522,183) Non-vested, September 30, 2020 $ 38.58 3,229,879
Schedule of share-based payment award, performance share, valuation assumptions	Year Ended September 30, 2020 2019 2018 Risk-free interest rate 1.60% 2.76% 1.92% Expected volatility of the Company’s stock 21.80% 22.90% 21.70%
Summary of Nonvested PSUs	A summary of the status of the Company’s non-vested PSUs at September 30, 2020, and changes for the fiscal year then ended, is presented below: Weighted Shares/Units Non-vested, September 30, 2019 $ 39.82 1,825,519 Granted 42.48 476,939 Vested 44.98 (515,975) Forfeited 38.87 (168,539) Non-vested, September 30, 2020 $ 39.06 1,617,944

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Sep. 30, 2020
Earnings Per Share [Abstract]
Earnings Per Share	The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions): Year Ended September 30, 2020 2019 2018 Income Available to Ordinary Shareholders Income from continuing operations $ 631 $ 1,100 $ 1,175 Income from discontinued operations — 4,574 987 Basic and diluted income available to shareholders $ 631 $ 5,674 $ 2,162 Weighted Average Shares Outstanding Basic weighted average shares outstanding 751.0 870.2 925.7 Effect of dilutive securities: Stock options, unvested restricted stock and unvested 2.6 4.1 6.0 Diluted weighted average shares outstanding 753.6 874.3 931.7 Antidilutive Securities Options to purchase shares 1.4 1.4 1.5

Equity and Noncontrolling Int_2

Equity and Noncontrolling Interests (Tables)	12 Months Ended
	Sep. 30, 2020
Stockholders' Equity Note [Abstract]
Equity Attributable to Johnson Controls plc and Noncontrolling Interests	The following schedules present changes in consolidated equity attributable to Johnson Controls and noncontrolling interests (in millions, net of tax): Equity Attributable to Johnson Controls Equity Attributable to Noncontrolling Interests Total Equity At September 30, 2017 $ 20,447 $ 920 $ 21,367 Total comprehensive income (loss): Net income 2,162 186 2,348 Foreign currency translation adjustments (458) (22) (480) Realized and unrealized losses on derivatives (19) (1) (20) Realized and unrealized gains on marketable securities 4 — 4 Other comprehensive loss (473) (23) (496) Comprehensive income 1,689 163 1,852 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (968) — (968) Dividends attributable to noncontrolling interests — (43) (43) Repurchases of ordinary shares (300) — (300) Change in noncontrolling interest share — 23 23 Adoption of ASU 2016-09 179 — 179 Reclassification from redeemable noncontrolling interest — 231 231 Other, including options exercised 117 — 117 At September 30, 2018 21,164 1,294 22,458 Total comprehensive income (loss): Net income 5,674 213 5,887 Foreign currency translation adjustments (325) (17) (342) Realized and unrealized gains (losses) on derivatives 7 (1) 6 Pension and postretirement plans (6) — (6) Other comprehensive loss (324) (18) (342) Comprehensive income 5,350 195 5,545 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (887) — (887) Dividends attributable to noncontrolling interests — (132) (132) Repurchases and retirements of ordinary shares (5,983) — (5,983) Divestiture of Power Solutions 483 (295) 188 Adoption of ASC 606 (45) — (45) Adoption of ASU 2016-16 (546) — (546) Other, including options exercised 230 1 231 At September 30, 2019 19,766 1,063 20,829 Total comprehensive income: Net income 631 164 795 Foreign currency translation adjustments 7 18 25 Realized and unrealized gains on derivatives 4 4 8 Pension and postretirement plans 8 — 8 Other comprehensive income 19 22 41 Comprehensive income 650 186 836 Other changes in equity: Cash dividends - ordinary shares ($1.04 per share) (780) — (780) Dividends attributable to noncontrolling interests — (114) (114) Repurchases and retirements of ordinary shares (2,204) — (2,204) Change in noncontrolling interest share (83) (49) (132) Adoption of ASC 842 (5) — (5) Other, including options exercised 103 — 103 At September 30, 2020 $ 17,447 $ 1,086 $ 18,533
Changes in Redeemable Noncontrolling Interests	The following schedules present changes in the redeemable noncontrolling interests (in millions): Year Ended September 30, 2018 Beginning balance, September 30 $ 211 Net income 35 Foreign currency translation adjustments (3) Realized and unrealized losses on derivatives (9) Dividends (3) Reclassification to noncontrolling interest (231) Ending balance, September 30 $ —
Changes in Accumulated Other Comprehensive Income, net of tax	The following schedules present changes in AOCI attributable to Johnson Controls (in millions, net of tax): Year Ended September 30, 2020 2019 2018 Foreign currency translation adjustments Balance at beginning of period $ (785) $ (939) $ (481) Divestiture of Power Solutions — 479 — Aggregate adjustment for the period (net of tax effect of $1, $0 and $(3)) (1) 7 (325) (458) Balance at end of period (778) (785) (939) Realized and unrealized gains (losses) on derivatives Balance at beginning of period (2) (13) 6 Divestiture of Power Solutions (net of tax effect of $0, $1 and $0) — 4 — Current period changes in fair value (net of tax effect of $1, $(1) and $(4)) 3 (1) (8) Reclassification to income (net of tax effect of $0, $2 and $(5)) (2) 1 8 (11) Balance at end of period 2 (2) (13) Realized and unrealized gains (losses) on marketable securities Balance at beginning of period — 8 4 Adoption of ASU 2016-01 (3) — (8) — Current period changes in fair value (net of tax effect of $0, $0 and $1) — — 5 Reclassification to income (net of tax effect of $0, $0 and $(1)) (4) — — (1) Balance at end of period — — 8 Pension and postretirement plans Balance at beginning of period (8) (2) (2) Reclassification to income (net of tax effect of $(1), $0 and $0) (1) — — Other changes (net of tax effect of $4, $0 and $0) 9 (6) — Balance at end of period — (8) (2) Accumulated other comprehensive loss, end of period $ (776) $ (795) $ (946) (1) During fiscal 2018, $12 million of cumulative CTA was recognized as part of the divestiture-related gain recognized as part of the divestiture of Scott Safety. (2) Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to 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. (3) The Company adopted ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" effective October 1, 2018 and, as a result, reclassified $8 million of unrealized gains on marketable securities to retained earnings. (4) During fiscal 2018, the Company sold certain marketable common stock for approximately $3 million. As a result, the Company recorded $2 million of realized gains within selling, general and administrative expenses.

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Plan Assets by Asset Category	The Company’s plan assets at September 30, 2020 and 2019, by asset category, are as follows (in millions): Fair Value Measurements Using: Asset Category Total as of September 30, 2020 Quoted Prices Significant Significant U.S. Pension Cash and Cash Equivalents $ 36 $ — $ 36 $ — Equity Securities Large-Cap 198 198 — — Small-Cap 255 255 — — International - Developed 220 220 — — International - Emerging 33 33 — — Fixed Income Securities Government 382 159 223 — Corporate/Other 1,386 1,386 — — Total Investments in the Fair Value Hierarchy 2,510 $ 2,251 $ 259 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 276 Due to Broker (80) Total Plan Assets $ 2,706 Non-U.S. Pension Cash and Cash Equivalents $ 178 $ 178 $ — $ — Equity Securities Large-Cap 357 23 334 — International - Developed 226 52 174 — International - Emerging 4 — 4 — Fixed Income Securities Government 704 64 640 — Corporate/Other 652 321 331 — Hedge Fund 49 — 49 — Real Estate 27 27 — — Total Investments in the Fair Value Hierarchy 2,197 $ 665 $ 1,532 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 16 Total Plan Assets $ 2,213 Postretirement Cash and Cash Equivalents $ 5 $ 5 $ — $ — Equity Securities Large-Cap 23 — 23 — Small-Cap 7 — 7 — International - Developed 16 — 16 — International - Emerging 10 — 10 — Fixed Income Securities Government 19 — 19 — Corporate/Other 53 — 53 — Commodities 12 — 12 — Real Estate 8 — 8 — Total Plan Assets $ 153 $ 5 $ 148 $ — Fair Value Measurements Using: Asset Category Total as of September 30, 2019 Quoted Prices Significant Significant U.S. Pension Cash and Cash Equivalents $ 55 $ 24 $ 31 $ — Equity Securities Large-Cap 276 276 — — Small-Cap 232 232 — — International - Developed 266 233 33 — International - Emerging 52 42 10 — Fixed Income Securities Government 332 47 285 — Corporate/Other 1,266 1,266 — — Real Estate 55 55 — — Total Investments in the Fair Value Hierarchy 2,534 $ 2,175 $ 359 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 202 Total Plan Assets $ 2,736 Non-U.S. Pension Cash and Cash Equivalents $ 174 $ 174 $ — $ — Large-Cap 214 23 191 — International - Developed 289 54 235 — International - Emerging 12 1 11 — Fixed Income Securities Government 778 69 709 — Corporate/Other 517 289 228 — Hedge Fund 69 — 69 — Real Estate 31 31 — — Total Investments in the Fair Value Hierarchy 2,084 $ 641 $ 1,443 $ — Investments Measured at Net Asset Value, as Practical Expedient: Real Estate Investments Measured at Net Asset Value* 14 Total Plan Assets $ 2,098 Postretirement Cash and Cash Equivalents $ 6 $ 6 $ — $ — Equity Securities Large-Cap 22 — 22 — Small-Cap 8 — 8 — International - Developed 19 — 19 — International - Emerging 9 — 9 — Fixed Income Securities Government 20 — 20 — Corporate/Other 55 — 55 — Commodities 13 — 13 — Real Estate 11 — 11 — Total Plan Assets $ 163 $ 6 $ 157 $ —
Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status	The table that follows contains the ABO and reconciliations of the changes in the PBO, the changes in plan assets and the funded status (in millions): Pension Benefits Postretirement U.S. Plans Non-U.S. Plans September 30, 2020 2019 2020 2019 2020 2019 Accumulated Benefit Obligation $ 3,217 $ 3,115 $ 2,627 $ 2,549 $ — $ — Change in Projected Benefit Obligation Projected benefit obligation at beginning of year $ 3,115 $ 3,191 $ 2,652 $ 2,542 $ 174 $ 196 Service cost — 8 25 22 1 1 Interest cost 67 108 36 54 4 6 Plan participant contributions — — 3 2 4 6 Power Solutions divestiture — (390) — (86) — (9) Other divestitures — — (2) (8) — — Actuarial (gain) loss 298 441 7 337 (3) 15 Amendments made during the year — — — 26 (13) (19) Benefits and settlements paid (263) (243) (109) (126) (21) (23) Estimated subsidy received — — — — 1 1 Curtailment — — (8) — — — Other — — 4 (2) — — Currency translation adjustment — — 118 (109) (1) — Projected benefit obligation at end of year $ 3,217 $ 3,115 $ 2,726 $ 2,652 $ 146 $ 174 Change in Plan Assets Fair value of plan assets at beginning of year $ 2,736 $ 3,046 $ 2,098 $ 2,117 $ 163 $ 174 Actual return on plan assets 228 266 75 203 4 7 Power Solutions divestiture — (371) — (45) — (4) Other divestitures — — — (4) — — Employer and employee contributions 5 38 56 50 7 9 Benefits paid (112) (136) (73) (76) (21) (23) Settlement payments (151) (107) (36) (50) — — Other — — — (2) — — Currency translation adjustment — — 93 (95) — — Fair value of plan assets at end of year $ 2,706 $ 2,736 $ 2,213 $ 2,098 $ 153 $ 163 Funded status $ (511) $ (379) $ (513) $ (554) $ 7 $ (11) Amounts recognized in the statement of financial position consist of: Prepaid benefit cost $ 32 $ 30 $ 29 $ 25 $ 78 $ 66 Accrued benefit liability (543) (409) (542) (579) (71) (77) Net amount recognized $ (511) $ (379) $ (513) $ (554) $ 7 $ (11) Weighted Average Assumptions (1) Discount rate (2) 2.25 % 2.95 % 1.35 % 1.50 % 1.90 % 2.65 % Rate of compensation increase N/A N/A 2.75 % 2.80 % N/A N/A (1) Plan assets and obligations are determined based on a September 30 measurement date at September 30, 2020 and 2019.
Components of Net Periodic Benefit Cost	The table that follows contains the components of net periodic benefit costs, which are primarily recorded in selling, general and administrative expenses in the consolidated statements of income (in millions): Pension Benefits Postretirement Benefits U.S. Plans Non-U.S. Plans Year ended September 30, 2020 2019 2018 2020 2019 2018 2020 2019 2018 Components of Net Periodic Benefit Cost (Credit): Service cost $ — $ 8 $ 15 $ 25 $ 22 $ 23 $ 1 $ 1 $ 2 Interest cost 67 108 105 36 54 57 4 6 7 Expected return on plan assets (180) (199) (229) (111) (105) (114) (9) (9) (10) Net actuarial (gain) loss 244 361 7 43 236 (22) 2 17 5 Amortization of prior service cost (credit) — — — 1 — — (3) — — Curtailment gain — — — (8) — (2) — — — Settlement loss 6 13 — — 4 — — — — Net periodic benefit cost (credit) 137 291 (102) (14) 211 (58) (5) 15 4 Net periodic benefit cost related to discontinued operations — (2) (5) — — (7) — — (2) Net periodic benefit cost (credit) included in continuing operations $ 137 $ 289 $ (107) $ (14) $ 211 $ (65) $ (5) $ 15 $ 2 Expense Assumptions: Discount rate 2.95 % 4.10 % 3.80 % 1.50 % 2.45 % 2.40 % 2.65 % 3.80 % 3.70 % Expected return on plan assets 6.90 % 7.10 % 7.50 % 5.20 % 5.20 % 5.35 % 5.70 % 5.65 % 5.65 % Rate of compensation increase N/A 3.50 % 3.20 % 2.80 % 2.95 % 2.90 % N/A N/A N/A
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Payments from Plans	In fiscal 2020, total employer contributions to the defined benefit pension plans were $58 million, none of which were voluntary contributions made by the Company. The Company expects to contribute approximately $46 million in cash to its defined benefit pension plans in fiscal 2021. Projected benefit payments from the plans as of September 30, 2020 are estimated as follows (in millions): 2021 $ 323 2022 301 2023 307 2024 309 2025 309 2026 - 2030 1,516
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Projected Benefit Payments from Plans	In fiscal 2020, total employer contributions to the postretirement plans were $3 million. The Company expects to contribute approximately $3 million in cash to its postretirement plans in fiscal 2021 for continuing operations. Projected benefit payments from the plans as of September 30, 2020 are estimated as follows (in millions): 2021 $ 13 2022 12 2023 12 2024 12 2025 11 2026 - 2030 45

Significant Restructuring and_2

Significant Restructuring and Impairment Costs (Tables)	12 Months Ended
	Sep. 30, 2020
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	The following table summarizes the changes in the Company’s 2020 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original reserve $ 196 $ 96 $ 5 $ 297 Utilized—cash (92) — (3) (95) Utilized—noncash — (96) — (96) Currency translation 2 — — 2 Balance at September 30, 2020 $ 106 $ — $ 2 $ 108
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	The following table summarizes the changes in the Company’s 2018 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original reserve $ 209 $ 42 $ 12 $ 263 Utilized—cash (45) — (2) (47) Utilized—noncash — (42) — (42) Balance at September 30, 2018 $ 164 $ — $ 10 $ 174 Utilized—cash (61) — (6) (67) Transfer to liabilities held for sale (4) — — (4) Currency translation (1) — — (1) Balance at September 30, 2019 $ 98 $ — $ 4 $ 102 Utilized—cash (69) — — (69) Adoption of ASC 842 (1) — — (4) (4) Currency translation 1 — — 1 Balance at September 30, 2020 $ 30 $ — $ — $ 30 (1) Represents liability for facility closings recorded as an offset to right-of-use asset upon adoption of ASC 842.
2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Schedule of Restructuring Reserve by Type of Cost [Table Text Block]	The following table summarizes the changes in the Company’s 2017 Plan reserve, included within other current liabilities in the consolidated statements of financial position (in millions): Employee Severance and Termination Benefits Long-Lived Asset Impairments Other Total Original Reserve $ 276 $ 77 $ 14 $ 367 Utilized—cash (75) — — (75) Utilized—noncash — (77) (1) (78) Adjustment to restructuring reserves 25 — — 25 Balance at September 30, 2017 $ 226 $ — $ 13 $ 239 Utilized—cash (152) — (6) (158) Currency translation (1) — — (1) Balance at September 30, 2018 $ 73 $ — $ 7 $ 80 Utilized—cash (11) — (2) (13) Transfer to liabilities held for sale (3) — — (3) Currency translation (3) — — (3) Balance at September 30, 2019 $ 56 $ — $ 5 $ 61 Utilized—cash (50) — — (50) Adoption of ASC 842 (1) — — (5) (5) Balance at September 30, 2020 $ 6 $ — $ — $ 6 (1) Represents liability for facility closings recorded as an offset to right-of-use asset upon adoption of ASC 842.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Significant Components of Company's Income Tax Provision from Continuing Operations	The more significant components of the Company’s income tax provision from continuing operations are as follows (in millions): Year Ended September 30, 2020 2019 2018 Tax expense at Ireland statutory rate $ 113 $ 132 $ 193 U.S. state income tax, net of federal benefit 8 15 15 Income subject to the U.S. federal tax rate (92) (110) 39 Income subject to rates different than the statutory rate 99 38 (201) Reserve and valuation allowance adjustments (70) (284) 31 Impact of acquisitions and divestitures — — 16 U.S. Tax Reform discrete items — — 108 Restructuring and impairment costs 50 (24) (4) Income tax provision (benefit) $ 108 $ (233) $ 197
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions): Year Ended September 30, 2020 2019 2018 Beginning balance, October 1 $ 2,451 $ 2,358 $ 2,161 Additions for tax positions related to the current year 128 433 435 Additions for tax positions of prior years 129 347 7 Reductions for tax positions of prior years (27) (88) (201) Settlements with taxing authorities (54) — (19) Statute closings and audit resolutions (99) (599) (25) Ending balance, September 30 $ 2,528 $ 2,451 $ 2,358
Tax Jurisdictions and Years Currently under Audit Exam	In the U.S., fiscal years 2017 through 2018 are currently under exam by the Internal Revenue Service (“IRS”) for certain legal entities. Additionally, the Company is currently under exam in the following major non-U.S. jurisdictions for continuing operations: Tax Jurisdiction Tax Years Covered Belgium 2015 - 2019 China 2019 Germany 2007 - 2018 Luxembourg 2017 - 2018 Mexico 2016 - 2017, 2019 Taiwan 2019 United Kingdom 2014 - 2015, 2017
Components of Provision for Income Taxes on Continuing Operations	Components of the provision (benefit) for income taxes on continuing operations were as follows (in millions): Year Ended September 30, 2020 2019 2018 Current U.S. federal $ 309 $ (1,025) $ 476 U.S. state 72 (33) 26 Non-U.S. 264 213 434 645 (845) 936 Deferred U.S. federal (382) 412 (372) U.S. state (43) 84 (10) Non-U.S. (112) 116 (357) (537) 612 (739) Income tax provision (benefit) $ 108 $ (233) $ 197
Deferred Taxes Classified in Consolidated Statements of Financial Position	Deferred taxes were classified in the consolidated statements of financial position as follows (in millions): September 30, 2020 2019 Other noncurrent assets $ 862 $ 552 Other noncurrent liabilities (385) (588) Net deferred tax asset (liability) $ 477 $ (36)
Temporary Differences and Carryforwards in Deferred Tax Assets and Liabilities	Temporary differences and carryforwards which gave rise to deferred tax assets and liabilities included (in millions): September 30, 2020 2019 Deferred tax assets Accrued expenses and reserves $ 474 $ 437 Employee and retiree benefits 286 265 Property, plant and equipment 182 — Net operating loss and other credit carryforwards 6,306 5,664 Research and development 112 106 Other, net 99 — 7,459 6,472 Valuation allowances (5,518) (5,068) 1,941 1,404 Deferred tax liabilities Property, plant and equipment — 139 Subsidiaries, joint ventures and partnerships 730 499 Intangible assets 734 759 Other, net — 43 1,464 1,440 Net deferred tax asset (liability) $ 477 $ (36)

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Financial Information Related To Company's Reportable Segments	Financial information relating to the Company’s reportable segments is as follows (in millions): Year Ended September 30, 2020 2019 2018 Net Sales Building Solutions North America $ 8,605 $ 9,031 $ 8,679 Building Solutions EMEA/LA 3,440 3,655 3,696 Building Solutions Asia Pacific 2,403 2,658 2,553 Global Products 7,869 8,624 8,472 Total net sales $ 22,317 $ 23,968 $ 23,400 Year Ended September 30, 2020 2019 2018 Segment EBITA Building Solutions North America (1) $ 1,157 $ 1,153 $ 1,109 Building Solutions EMEA/LA (2) 338 368 344 Building Solutions Asia Pacific (3) 319 341 347 Global Products (4) 1,134 1,179 1,338 Total segment EBITA $ 2,948 $ 3,041 $ 3,138 Amortization of intangible assets (386) (377) (376) Corporate expenses (5) (371) (405) (584) Net financing charges (231) (350) (401) Restructuring and impairment costs (783) (235) (255) Net mark-to-market adjustments (274) (618) 24 Income from continuing operations before income taxes $ 903 $ 1,056 $ 1,546 September 30, 2020 2019 2018 Assets Building Solutions North America (6) $ 15,215 $ 15,562 $ 15,384 Building Solutions EMEA/LA (7) 4,989 4,786 4,997 Building Solutions Asia Pacific (8) 2,720 2,657 2,743 Global Products (9) 13,882 13,945 14,261 36,806 36,950 37,385 Assets held for sale 147 158 8,203 Unallocated 3,862 5,179 3,209 Total $ 40,815 $ 42,287 $ 48,797 Year Ended September 30, 2020 2019 2018 Depreciation/Amortization Building Solutions North America $ 233 $ 233 $ 236 Building Solutions EMEA/LA 102 112 110 Building Solutions Asia Pacific 24 23 28 Global Products 414 396 390 773 764 764 Corporate 49 61 60 Continuing Operations 822 825 824 Discontinued Operations — 32 261 Total $ 822 $ 857 $ 1,085 Year Ended September 30, 2020 2019 2018 Capital Expenditures Building Solutions North America $ 93 $ 119 $ 114 Building Solutions EMEA/LA 99 93 73 Building Solutions Asia Pacific 36 26 26 Global Products 191 310 307 419 548 520 Corporate 24 38 125 Continuing Operations 443 586 645 Discontinued Operations — 197 385 Total $ 443 $ 783 $ 1,030 (1) Building Solutions North America segment EBITA for the years ended September 30, 2020 and 2018 excludes $520 million and $20 million, respectively, of restructuring and impairment costs. For the year ended September 30, 2020, Building Solutions North America includes $1 million of equity losses. (2) Building Solutions EMEA/LA segment EBITA for the years ended September 30, 2020 and 2018 excludes $59 million, and $56 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions EMEA/LA segment EBITA includes $6 million, $12 million and $1 million, respectively, of equity income. (3) Building Solutions Asia Pacific segment EBITA for the years ended September 30, 2020 and 2018 excludes $56 million and $16 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions Asia Pacific segment EBITA includes less than $1 million, $1 million and $1 million, respectively, of equity income. (4) Global Products segment EBITA for the years ended September 30, 2020, 2019 and 2018 excludes $143 million, $235 million and $113 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Global Products segment EBITA includes $166 million, $179 million and $175 million, respectively, of equity income. (5) Corporate expenses for the years ended September 30, 2020 and 2018 excludes $5 million and $50 million, respectively, of restructuring and impairment costs. (6) Buildings Solutions North America assets as of September 30, 2020, 2019 and 2018 include $7 million, $8 million and $8 million, respectively, of investments in partially-owned affiliates. (7) Building Solutions EMEA/LA assets as of September 30, 2020, 2019 and 2018 include $108 million, $109 million and $99 million, respectively, of investments in partially-owned affiliates. (8) Building Solutions Asia Pacific assets as of September 30, 2020, 2019 and 2018 include $2 million and $6 million, and $1 million, respectively, of investments in partially-owned affiliates.
Geographic Segments	Financial information relating to the Company’s operations by geographic area is as follows (in millions): Year Ended September 30, 2020 2019 2018 Net Sales United States $ 11,007 $ 11,773 $ 11,306 China 1,206 1,424 1,480 Japan 1,789 1,943 1,903 Germany 583 629 616 United Kingdom 980 1,042 1,075 Taiwan 725 612 661 Other foreign 4,113 4,625 4,423 Other European countries 1,914 1,920 1,936 Total $ 22,317 $ 23,968 $ 23,400 Long-Lived Assets (Year-end) United States $ 1,713 $ 1,824 $ 1,879 China 164 326 332 Japan 204 228 209 Germany 22 20 19 United Kingdom 70 77 73 Taiwan 133 141 154 Other foreign 567 568 464 Other European countries 186 164 170 Total $ 3,059 $ 3,348 $ 3,300

Nonconsolidated Partially-Own_2

Nonconsolidated Partially-Owned Affiliates (Tables)	12 Months Ended
	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments- Summarized balance sheet information	Summarized balance sheet data as of September 30, 2019 is as follows (in millions): September 30, 2019 Current assets $ 2,941 Noncurrent assets 1,020 Total assets $ 3,961 Current liabilities $ 2,135 Noncurrent liabilities 157 Noncontrolling interests 67 Shareholders’ equity 1,602 Total liabilities and shareholders’ equity $ 3,961
Equity Method Investments- Summarized income statement information	Summarized income statement data for the years ended September 30, 2019 and 2018 is as follows (in millions): Year Ended September 30, 2019 2018 Net sales $ 3,882 $ 3,974 Gross profit 1,070 1,049 Net income 411 390 Income attributable to noncontrolling interests 13 10 Net income attributable to the entity 398 380

Guarantees (Tables)

Guarantees (Tables)	12 Months Ended
	Sep. 30, 2020
Product Warranties Disclosures [Abstract]
Changes in Carrying Amount of Product Warranty Liability	The changes in the carrying amount of the Company’s total product warranty liability for continuing operations for the fiscal years ended September 30, 2020 and 2019 were as follows (in millions). Extended warranty for which deferred revenue is recorded is not included in the table below, but rather included within the contract balances table in the Note 4, "Revenue Recognition," of the notes to consolidated financial statements for all periods presented. Year Ended 2020 2019 Balance at beginning of period $ 156 $ 197 Accruals for warranties issued during the period 71 78 Accruals from acquisitions and divestitures — 1 Accruals related to pre-existing warranties (including changes in estimates) 9 (39) Settlements made (in cash or in kind) during the period (71) (79) Currency translation 2 (2) Balance at end of period $ 167 $ 156

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Sep. 30, 2020
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	The following table presents net sales to and purchases from related parties for the years ended September 30, 2020, 2019, and 2018 (in millions): Year Ended September 30, 2020 2019 2018 Net sales to related parties $ 194 $ 217 $ 220 Purchases from related parties 85 66 63 The following table presents receivables from and payables to related parties in the consolidated statements of financial position (in millions): September 30, 2020 2019 Receivable from related parties $ 48 $ 34 Payable to related parties 11 6

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Accounting Policies (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Oct. 01, 2019USD ($)	Jun. 30, 2019USD ($)
Financial Statement Details [Line Items]
Number of Countries in which Entity Operates	150
Maturity period to be considered cash equivalents	three months
Restricted Cash and Investments, Current	$ 9	$ 16
Pooled subscriber assets and related deferred revenue, useful life	12 years
Non-pooled subscriber assets and related deferred revenue, useful life	15 years
Standard chargeback period from dealer for monitoring service cancellations	6 months
Non-standard chargeback period from dealer for monitoring service cancellations	12 months
Research and Development Expense	$ 274	319	$ 310
Foreign currency transaction gains (losses)	$ (32)	$ (10)	$ 1
Minimum
Financial Statement Details [Line Items]
Estimated useful life of dealer intangible assets	12 years
Maximum
Financial Statement Details [Line Items]
Estimated useful life of dealer intangible assets	15 years
Building And Improvements | Minimum
Financial Statement Details [Line Items]
Estimated useful lives	3 years
Building And Improvements | Maximum
Financial Statement Details [Line Items]
Estimated useful lives	40 years
Machinery and Equipment | Minimum
Financial Statement Details [Line Items]
Estimated useful lives	3 years
Machinery and Equipment | Maximum
Financial Statement Details [Line Items]
Estimated useful lives	15 years
Other noncurrent assets
Financial Statement Details [Line Items]
Operating Lease, Right-of-Use Asset	$ 1,190
Accounting Standards Update 2016-02 [Member]
Financial Statement Details [Line Items]
Operating Lease, Right-of-Use Asset				$ 1,100
Power Solutions
Financial Statement Details [Line Items]
Disposal Group, Discontinued Operations, Consideration, net					$ 11,600

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Variable Interest Entities, Additional Information (Details)	Sep. 30, 2020
Variable Interest Entity [Line Items]
Interest Percentage Minimum For Investments In Partially Owned Affiliates To Be Accounted For By Equity Method	20.00%

Acquisitions and Divestitures A

Acquisitions and Divestitures Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Business Acquisitions
Business Combination, Consideration Transferred		$ 82	$ 32
Payments to acquire businesses, net of cash acquired		77	25	$ 21
Goodwill, acquired during period		56	25
Payments to Acquire Additional Interest in Subsidiaries		132	0	0
Business Acquisitions, Not Specified
Business Acquisitions
Business Combination, Consideration Transferred				21
Payments to acquire businesses, net of cash acquired			25
Global Products
Business Acquisitions
Payments to Acquire Additional Interest in Subsidiaries	$ 132
Compensation charge related to the cash settlement of equity awards	$ 39
Global Products | Business Acquisitions, Not Specified
Business Acquisitions
Goodwill, acquired during period		21	11	14
Building Solutions Asia Pacific | Business Acquisitions, Not Specified
Business Acquisitions
Goodwill, acquired during period			8
Building Solutions EMEA/LA | Business Acquisitions, Not Specified
Business Acquisitions
Goodwill, acquired during period		$ 35	$ 6	$ 1

Acquisitions and Divestitures D

Acquisitions and Divestitures Divestitures (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2019	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Divestitures [Line Items]
Proceeds from divestitures				$ 2	$ 4	$ 0
Business divestitures, net of cash divested				135	12	2,202
Goodwill, written off related to divestiture				11	23
Gain on divestitures - net				0	0	114
Power Solutions
Divestitures [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 13,200
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		4,000
Disposal Group, Discontinued Operations, Consideration, net		11,600
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax		$ 5,200			5,200
Business Divestitures, Not Specific
Divestitures [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 152			$ 152	18
Business divestitures, net of cash divested	135				16
Business Divestitures, Not Specific | Building Solutions EMEA/LA
Divestitures [Line Items]
Goodwill, written off related to divestiture					$ 1
Business Divestitures, Not Specific | Global Products
Divestitures [Line Items]
Proceeds from divestitures						204
Goodwill, written off related to divestiture						$ 35
Business Divestitures, Not Specific | Building Solutions Asia Pacific
Divestitures [Line Items]
Goodwill, written off related to divestiture	$ 11
Scott Safety business [Member]
Divestitures [Line Items]
Business divestitures, net of cash divested			$ 2,000
Gain (loss) on divestiture			114
Goodwill, written off related to divestiture			1,200
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax			84
Income tax expense from disposal			$ 30

Discontinued Operations Discont

Discontinued Operations Discontinued Operations, Income Statement Disclosures - (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations attributable to noncontrolling interests		$ 0	$ 24	$ 47
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent		$ 0	$ 4,574	$ 987
Ireland statutory rate			12.50%	12.50%
Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$ 5,200		$ 5,200
Depreciation and Amortization, Discontinued Operations			117
Discontinued Operations, Disposed of by Sale [Member] | Power Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Sales, Discontinued Operations			5,001	$ 8,000
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax			6,039	1,355
Provision for income taxes on discontinued operations			(1,441)	(321)
Income from discontinued operations attributable to noncontrolling interests			(24)	(47)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent			$ 4,574	$ 987

Discontinued Operations Assets

Discontinued Operations Assets and Liabilities Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	24 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2018
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale			$ 158	$ 147	$ 8,203
Building Solutions Asia Pacific | Individually immaterial disposal group [Member]
Assets and Liabilities Held for Sale [Line Items]
Assets held for sale				147
Global Products
Assets and Liabilities Held for Sale [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 15	$ 235	$ 235	$ 250

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 22,317,000,000	$ 23,968,000,000	$ 23,400,000,000
Contract with Customer, Liability, Current	(1,435,000,000)	(1,407,000,000)
Contract with Customer Asset Liability Net	(181,000,000)	(156,000,000)
Contract with Customer, Liability, Revenue Recognized	1,300,000,000	1,200,000,000
Revenue, Remaining Performance Obligation, Amount	$ 14,400,000,000
Remaining Performance Obligations Expected as Revenue Over the Next Two Years	60.00%
Capitalized Contract Cost, Gross	$ 223,000,000	212,000,000
Capitalized Contract Cost, Amortization	162,000,000	157,000,000
Capitalized Contract Cost, Impairment Loss	0	0
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Net sales	16,253,000,000	17,711,000,000
Services [Domain]
Disaggregation of Revenue [Line Items]
Net sales	6,064,000,000	6,257,000,000
Building Solutions North America
Disaggregation of Revenue [Line Items]
Net sales	8,605,000,000	9,031,000,000
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Net sales	5,371,000,000	5,745,000,000
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Net sales	3,234,000,000	3,286,000,000
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Net sales	3,440,000,000	3,655,000,000
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Net sales	1,644,000,000	1,767,000,000
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Net sales	1,796,000,000	1,888,000,000
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	2,403,000,000	2,658,000,000
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Net sales	1,369,000,000	1,575,000,000
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Net sales	1,034,000,000	1,083,000,000
Global Products
Disaggregation of Revenue [Line Items]
Net sales	7,869,000,000	8,624,000,000
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Net sales	7,869,000,000	8,624,000,000
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Net sales	0	0
Global Products | Building management systems
Disaggregation of Revenue [Line Items]
Net sales	1,205,000,000	1,292,000,000
Global Products | HVAC & refrigeration equipment
Disaggregation of Revenue [Line Items]
Net sales	5,613,000,000	6,181,000,000
Global Products | Specialty products
Disaggregation of Revenue [Line Items]
Net sales	1,051,000,000	1,151,000,000
Other current assets
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Gross	119,000,000	110,000,000
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Current	1,395,000,000	1,389,000,000
Other noncurrent assets
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Noncurrent	104,000,000	90,000,000
Capitalized Contract Cost, Gross	104,000,000	102,000,000
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Current	(1,435,000,000)	(1,407,000,000)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Noncurrent	$ (245,000,000)	$ (228,000,000)

Inventories Schedule of Invento

Inventories Schedule of Inventories (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 629	$ 588
Work-in-process	142	176
Finished goods	1,002	1,050
Inventories	$ 1,773	$ 1,814

Property, Plant and Equipment S

Property, Plant and Equipment Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Buildings and improvements	$ 1,351	$ 1,499
Subscriber systems	679	661
Machinery and equipment	3,332	2,969
Construction in progress	327	465
Land	241	250
Total property, plant and equipment	5,930	5,844
Less accumulated depreciation	(2,871)	(2,496)
Property, plant and equipment - net	$ 3,059	$ 3,348	$ 3,300

Property, Plant and Equipment_3

Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Interest costs capitalized	$ 1	$ 6	$ 17

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Roll Forward]
Goodwill, Beginning Balance				$ 18,178	$ 18,381
Business Acquisitions				56	25
Business Divestitures				(11)	(23)
Impairments	$ 0		$ 0	(424)	0
Currency Translation and Other				133	(205)
Goodwill, Ending Balance	17,932		18,178	17,932	18,178
Building Solutions North America
Goodwill [Roll Forward]
Impairments				(424)
Building Solutions North America | Building Technologies & Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance				9,588	9,603
Business Acquisitions				0	0
Business Divestitures				0	0
Impairments		$ (424)		(424)	0
Currency Translation and Other				(4)	(15)
Goodwill, Ending Balance	9,160		9,588	9,160	9,588
Building Solutions EMEA/LA | Building Technologies & Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance				1,849	1,950
Business Acquisitions				35	6
Business Divestitures				0	(1)
Impairments				0	0
Currency Translation and Other				83	(106)
Goodwill, Ending Balance	1,967		1,849	1,967	1,849
Building Solutions Asia Pacific | Building Technologies & Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance				1,194	1,235
Business Acquisitions				0	8
Business Divestitures				(11)	0
Impairments				0	0
Currency Translation and Other				43	(49)
Goodwill, Ending Balance	1,226		1,194	1,226	1,194
Global Products | Building Technologies & Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance				5,547	5,593
Business Acquisitions				21	11
Business Divestitures				0	(22)
Impairments				0	0
Currency Translation and Other				11	(35)
Goodwill, Ending Balance	$ 5,579		$ 5,547	$ 5,579	$ 5,547

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Goodwill [Line Items]
Goodwill impairment loss	$ 0		$ 0	$ 424	$ 0
Goodwill	$ 17,932		18,178	$ 17,932	18,178	$ 18,381
North America Retail [Member]
Goodwill [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	6.00%			6.00%
Building Solutions North America
Goodwill [Line Items]
Goodwill impairment loss				$ 424
Building Solutions North America | North America Retail [Member]
Goodwill [Line Items]
Goodwill	$ 230			230
Building Technologies & Solutions | Global Products
Goodwill [Line Items]
Goodwill, Transfers					22
Goodwill impairment loss				0	0
Goodwill	5,579		5,547	5,579	5,547	5,593
Building Technologies & Solutions | Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss						47
Goodwill impairment loss				0	0
Goodwill	1,967		1,849	1,967	1,849	1,950
Building Technologies & Solutions | Building Solutions North America
Goodwill [Line Items]
Goodwill impairment loss		$ 424		424	0
Goodwill	$ 9,160		$ 9,588	$ 9,160	$ 9,588	$ 9,603

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,090	$ 6,985
Net, Total Intangible Assets	5,356	5,632
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,762	4,613
Accumulated Amortization	(1,734)	(1,353)
Net, Total Amortized Intangible Assets	3,028	3,260
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,328	2,372
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,332	1,307
Accumulated Amortization	(497)	(370)
Net, Total Amortized Intangible Assets	835	937
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,773	2,722
Accumulated Amortization	(969)	(759)
Net, Total Amortized Intangible Assets	1,804	1,963
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	657	584
Accumulated Amortization	(268)	(224)
Net, Total Amortized Intangible Assets	389	360
Trademarks
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,248	2,282
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 90

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets Other Intangible Assets Additional Information (Details) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets				$ 386	$ 377	$ 376
Future amortization expense, 2021	$ 404			404
Future amortization expense, 2022	403			403
Future amortization expense, 2023	402			402
Future amortization expense, 2024	383			383
Future amortization expense, 2025	365			365
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	$ 62	$ 0	62
Security Business [Member]
Intangible Assets [Line Items]
Indefinite-Lived Trademarks	$ 299			$ 299
Indefinite-Lived Intangibles, Percentage Of Fair Value In Excess Of Carrying Amount	0.04			0.04
Asia Pacific Subscriber Business [Member]
Intangible Assets [Line Items]
Indefinite-Lived Trademarks	$ 37			$ 37
Indefinite-Lived Intangibles, Percentage Of Fair Value In Excess Of Carrying Amount	0.02			0.02

Leases (Details)

Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Operating Leased Assets [Line Items]
Operating Lease, Cost	$ 399
Variable Lease, Cost	145
Lease, Cost	$ 544
Operating Leases, Rent Expense		$ 452	$ 408
Operating Lease, Weighted Average Remaining Lease Term	6 years
Operating Lease, Weighted Average Discount Rate, Percent	2.20%
Operating Lease, Payments	$ 397
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	467
Lessee, Operating Lease, Liability, to be Paid, Year One	352
Lessee, Operating Lease, Liability, to be Paid, Year Two	279
Lessee, Operating Lease, Liability, to be Paid, Year Three	191
Lessee, Operating Lease, Liability, to be Paid, Year Four	143
Lessee, Operating Lease, Liability, to be Paid, Year Five	91
Lessee, Operating Lease, Liability, to be Paid, after Year Five	235
Lessee, Operating Lease, Liability, to be Paid	1,291
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(84)
Operating Lease, Liability	1,207
Operating Leases, Future Minimum Payments Due, Next Twelve Months		352
Operating Leases, Future Minimum Payments, Due in Two Years		287
Operating Leases, Future Minimum Payments Receivable, in Three Years		200
Operating Leases, Future Minimum Payments, Due in Four Years		111
Operating Leases, Future Minimum Payments, Due in Five Years		71
Operating Leases, Future Minimum Payments, Due Thereafter		172
Operating Leases, Future Minimum Payments Due		$ 1,193
Other noncurrent assets
Operating Leased Assets [Line Items]
Operating Lease, Right-of-Use Asset	1,190
Other current liabilities
Operating Leased Assets [Line Items]
Operating Lease, Liability, Current	332
Other Noncurrent Liabilities [Member]
Operating Leased Assets [Line Items]
Operating Lease, Liability, Noncurrent	$ 875

Debt and Financing Arrangemen_3

Debt and Financing Arrangements Short-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Short-term Debt [Line Items]
Short-term Debt			$ 31	$ 10
Short-term Debt, Weighted Average Interest Rate, at Point in Time			3.40%	2.00%
Commercial Paper			$ 0	$ 0
$2.5 billion facility expiring Dec 2024 [Domain]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,500
$500 million facility expiring Dec 2020 [Domain]
Short-term Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		500
$2 billion committed revolving credit facility [Member]
Short-term Debt [Line Items]
Debt Instrument, Term	5 years
Line of Credit, Borrowing Capacity, Terminated		$ 2,000
$750 million total capacity revolving credit facilities [Member]
Short-term Debt [Line Items]
Debt Instrument, Term		364 days
Line of Credit, Borrowing Capacity, Terminated		$ 750

Debt and Financing Arrangemen_4

Debt and Financing Arrangements Long-Term Debt (Details)	Sep. 30, 2020USD ($)	Sep. 30, 2020EUR (€)	Sep. 30, 2020JPY (¥)	Sep. 30, 2019USD ($)
Debt Instrument [Line Items]
Other Long-term Debt	$ 8,000,000			$ 3,000,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities	7,822,000,000			7,240,000,000
Less: current portion	262,000,000			501,000,000
Debt Issuance Costs, Line of Credit Arrangements, Gross	34,000,000			31,000,000
Net long-term debt	$ 7,526,000,000			6,708,000,000
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%	4.625%
Debt instrument, face amount	$ 25,000,000
Long-term Debt	$ 26,000,000			26,000,000
Four Point Six Two Five Percent Due in Two Thousand Twenty Three [Member] | Tyco International Finance S.A. (TIFSA) [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%	4.625%
Debt instrument, face amount	$ 7,000,000
Long-term Debt	$ 7,000,000			7,000,000
5.0 % Due in 2020 | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%	5.00%
Debt instrument, face amount	$ 47,000,000
Long-term Debt	$ 0			47,000,000
5.0 % Due in 2020 | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.00%	5.00%	5.00%
Debt instrument, face amount	$ 453,000,000
Long-term Debt	$ 0			453,000,000
Zero Point Zero Percent Due Two Thousand Twenty-One [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%	0.00%	0.00%
Debt instrument, face amount | €		€ 750,000,000
Long-term Debt	$ 0			818,000,000
4.25% Due in 2021 | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%	4.25%
Debt instrument, face amount	$ 53,000,000
Long-term Debt	$ 53,000,000			53,000,000
4.25% Due in 2021 | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%	4.25%
Debt instrument, face amount	$ 204,000,000
Long-term Debt	$ 204,000,000			204,000,000
3.75 % Due in 2022 | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%	3.75%
Debt instrument, face amount	$ 22,000,000
Long-term Debt	$ 22,000,000			22,000,000
3.75 % Due in 2022 | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%	3.75%	3.75%
Debt instrument, face amount	$ 171,000,000
Long-term Debt	$ 171,000,000			171,000,000
One Point Zero Percent Due Two Thousand Twenty Three | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.00%	1.00%	1.00%
Debt instrument, face amount | €		€ 888,000,000
Long-term Debt	$ 1,039,000,000			967,000,000
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.625%	3.625%	3.625%
Debt instrument, face amount	$ 31,000,000
Long-term Debt	$ 31,000,000			31,000,000
Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.625%	3.625%	3.625%
Debt instrument, face amount	$ 453,000,000
Long-term Debt	$ 453,000,000			453,000,000
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.375%	1.375%	1.375%
Debt instrument, face amount | €		€ 423,000,000
Long-term Debt	$ 503,000,000			471,000,000
One Point Three Seven Five Percent Due in Two Thousand Twenty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.375%	1.375%	1.375%
Debt instrument, face amount | €		€ 54,000,000
Long-term Debt	$ 64,000,000			60,000,000
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%	3.90%	3.90%
Debt instrument, face amount	$ 487,000,000
Long-term Debt	$ 516,000,000			521,000,000
Three Point Ninety Percent Due in Two Thousand Twenty Six [Member] | Tyco International Finance S.A. (TIFSA) [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.90%	3.90%	3.90%
Debt instrument, face amount	$ 51,000,000
Long-term Debt	$ 51,000,000			51,000,000
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%	6.00%
Debt instrument, face amount	$ 8,000,000
Long-term Debt	$ 8,000,000			8,000,000
Six Point Zero Percent Due Two Thousand Thirty Six [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	6.00%	6.00%
Debt instrument, face amount	$ 342,000,000
Long-term Debt	$ 339,000,000			339,000,000
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.70%	5.70%	5.70%
Debt instrument, face amount	$ 30,000,000
Long-term Debt	$ 30,000,000			30,000,000
Five Point Seven Percent Due Two Thousand Forty One | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.70%	5.70%	5.70%
Debt instrument, face amount	$ 190,000,000
Long-term Debt	$ 189,000,000			189,000,000
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%	5.25%	5.25%
Debt instrument, face amount	$ 6,000,000
Long-term Debt	$ 6,000,000			6,000,000
Five Point Two Five Percent Due Two Thousand Forty Two | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%	5.25%	5.25%
Debt instrument, face amount	$ 155,000,000
Long-term Debt	$ 155,000,000			155,000,000
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%	4.625%
Debt instrument, face amount	$ 6,000,000
Long-term Debt	$ 6,000,000			6,000,000
Four Point Six Two Five Percent Due Two Thousand Forty Four | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%	4.625%
Debt instrument, face amount	$ 444,000,000
Long-term Debt	$ 441,000,000			441,000,000
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.125%	5.125%	5.125%
Debt instrument, face amount	$ 477,000,000
Long-term Debt	$ 564,000,000			567,000,000
Five Point One Two Five Percent Due in Two Thousand Forty Five [Member] | Tyco International Finance S.A. (TIFSA) [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.125%	5.125%	5.125%
Debt instrument, face amount	$ 23,000,000
Long-term Debt	$ 22,000,000			22,000,000
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.95%	6.95%	6.95%
Debt instrument, face amount	$ 4,000,000
Long-term Debt	$ 4,000,000			4,000,000
Six Point Nine Five Percent Due Two Thousand Forty Six | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.95%	6.95%	6.95%
Debt instrument, face amount	$ 32,000,000
Long-term Debt	$ 32,000,000			32,000,000
Four point five percent maturing in fiscal 2047 [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%	4.50%
Debt instrument, face amount	$ 500,000,000
Long-term Debt	$ 496,000,000			496,000,000
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls Inc. [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.95%	4.95%	4.95%
Debt instrument, face amount	$ 15,000,000
Long-term Debt	$ 15,000,000			15,000,000
Four Point Nine Five Percent Due Two Thousand Sixty Four [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.95%	4.95%	4.95%
Debt instrument, face amount	$ 341,000,000
Long-term Debt	$ 340,000,000			340,000,000
LIBOR JPY Plus Zero Point Four Two Percent Due in Two Thousand Twenty Two [Member] | Johnson Controls International plc [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.40%	0.40%	0.40%
Debt instrument, face amount | ¥			¥ 25,000,000,000
Long-term Debt	$ 237,000,000			232,000,000
Zero Point Three Seven Five Percent Due Two Thousand Twenty Seven | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.375%	0.375%	0.375%
Debt instrument, face amount | €		€ 500,000,000
Long-term Debt	$ 583,000,000			0
One Point Seven Five Percent Due Two Thousand Thirty | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.75%	1.75%	1.75%
Debt instrument, face amount	$ 625,000,000
Long-term Debt	$ 623,000,000			0
One Point Zero Percent Due Two Thousand Thirty Two | Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.00%	1.00%	1.00%
Debt instrument, face amount | €		€ 500,000,000
Long-term Debt	$ 584,000,000			$ 0

Long-Term Debt Additional Detai

Long-Term Debt Additional Details (Details)	12 Months Ended
	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2020EUR (€)
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 262,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	432,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	1,073,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	484,000,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	567,000,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,004,000,000
Interest Paid, Excluding Capitalized Interest, Operating Activities	247,000,000	$ 369,000,000	$ 401,000,000
Gain (Loss) on Extinguishment of Debt	0	(60,000,000)	$ 0
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | Zero Point Three Seven Five Percent Due Two Thousand Twenty Seven
Debt Instrument [Line Items]
Debt instrument, face amount | €				€ 500,000,000
Long-term Debt	$ 583,000,000	0
Debt Instrument, Interest Rate, Stated Percentage	0.375%			0.375%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Seven Five Percent Due Two Thousand Thirty
Debt Instrument [Line Items]
Debt instrument, face amount	$ 625,000,000
Long-term Debt	$ 623,000,000	0
Debt Instrument, Interest Rate, Stated Percentage	1.75%			1.75%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Zero Percent Due Two Thousand Thirty Two
Debt Instrument [Line Items]
Debt instrument, face amount | €				€ 500,000,000
Long-term Debt	$ 584,000,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage	1.00%			1.00%

Debt and Financing Arrangemen_5

Debt and Financing Arrangements Financing Arrangements (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2020USD ($)	Mar. 31, 2020USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2020EUR (€)	Sep. 30, 2020EUR (€)
$500 million due March 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt		$ 500,000,000
Interest rate on notes		5.00%
$300 million bank term loan [Member]
Debt Instrument [Line Items]
Repayments of Debt	$ 300,000,000
$275 million bank term loan [Member]
Debt Instrument [Line Items]
Repayments of Debt			$ 275,000,000
$675 million European financing arrangements due September 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt			675,000,000
$750 Million Euro Notes Due December 2020 [Member]
Debt Instrument [Line Items]
Repayments of Debt | €				€ 750,000,000
Johnson Controls International plc [Member] | Three Point Six Two Five Percent Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 453,000,000
Interest rate on notes			3.625%		3.625%
Johnson Controls International plc [Member] | Four Point Nine Five Percent Due Two Thousand Sixty Four [Member]
Debt Instrument [Line Items]
Debt instrument, face amount			$ 341,000,000
Interest rate on notes			4.95%		4.95%
Johnson Controls International plc [Member] | Zero Point Zero Percent Due Two Thousand Twenty-One [Member]
Debt Instrument [Line Items]
Debt instrument, face amount | €					€ 750,000,000
Interest rate on notes			0.00%		0.00%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | Zero Point Three Seven Five Percent Due Two Thousand Twenty Seven
Debt Instrument [Line Items]
Debt instrument, face amount | €					€ 500,000,000
Interest rate on notes			0.375%		0.375%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Zero Percent Due Two Thousand Thirty Two
Debt Instrument [Line Items]
Debt instrument, face amount | €					€ 500,000,000
Interest rate on notes			1.00%		1.00%
Johnson Controls International plc (JCI) and Tyco Fire & Security Finance S.C.A. (TFSCA) | One Point Seven Five Percent Due Two Thousand Thirty
Debt Instrument [Line Items]
Debt instrument, face amount			$ 625,000,000
Interest rate on notes			1.75%		1.75%

Debt and Financing Arrangemen_6

Debt and Financing Arrangements Net Financing Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Debt Disclosure [Abstract]
Interest expense, net of capitalized interest costs	$ 240	$ 335	$ 409
Bank fees and bond cost amortization	26	28	30
Gain (Loss) on Extinguishment of Debt	0	60	0
Interest income	(23)	(61)	(13)
Net foreign exchange results for financing activities	(12)	(12)	(25)
Net financing charges	$ 231	$ 350	$ 401

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities Outstanding Commodity Hedge Contracts (Details) - T	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Copper [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass	2,497	3,561
Aluminum [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass	3,036	2,967

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments [Line Items]
Derivative, amount of hedged ordinary shares	1.4
Gross amount recognized, derivative assets	$ 87	$ 97
Gross amount, derivative liabilities	3,020	2,568
Equity swap
Derivative Instruments [Line Items]
Derivative, Amount of Hedged Item	60
Designated as Hedging Instrument
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	12	16
Gross amount, derivative liabilities	3,020	2,568
Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	10	16
Designated as Hedging Instrument | Other current assets | Commodity derivatives
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	2	0
Designated as Hedging Instrument | Other noncurrent assets | Equity swap
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	0	0
Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	10	23
Designated as Hedging Instrument | Other current liabilities | Commodity derivatives
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	0	1
Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	3,010	2,544
Not Designated as Hedging Instrument
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	75	81
Gross amount, derivative liabilities	0	0
Not Designated as Hedging Instrument | Other current assets | Foreign currency exchange derivatives
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	17	19
Not Designated as Hedging Instrument | Other current assets | Commodity derivatives
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	0	0
Not Designated as Hedging Instrument | Other noncurrent assets | Equity swap
Derivative Instruments [Line Items]
Gross amount recognized, derivative assets	58	62
Not Designated as Hedging Instrument | Other current liabilities | Foreign currency exchange derivatives
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	0	0
Not Designated as Hedging Instrument | Other current liabilities | Commodity derivatives
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	0	0
Not Designated as Hedging Instrument | Long-term debt | Foreign Currency Denominated Debt [Member]
Derivative Instruments [Line Items]
Gross amount, derivative liabilities	$ 0	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities Location and Amount of Gains and Losses Gross of Tax on Derivative Instruments and Related Hedge Items (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 82	$ (3)	$ 27
Foreign currency exchange derivatives | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	(1)	(8)	4
Foreign currency exchange derivatives | Net financing charges
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	87	(60)	42
Foreign currency exchange derivatives | Income tax provision
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0	(1)	(4)
Foreign currency exchange derivatives | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	0	52	(7)
Equity swap | Selling, general and administrative
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	(4)	14	(8)
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	7	(2)	(12)
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(3)	(10)	16
Cash Flow Hedging | Foreign currency exchange derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	1	2	2
Cash Flow Hedging | Foreign currency exchange derivatives | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	(5)	4	2
Cash Flow Hedging | Foreign currency exchange derivatives | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	0	0	2
Cash Flow Hedging | Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	6	(4)	(14)
Cash Flow Hedging | Commodity derivatives | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	2	(4)	5
Cash Flow Hedging | Commodity derivatives | Discontinued Operations
Derivative Instruments, Gain (Loss) [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 0	$ (10)	$ 7

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities Derivative Assets and Liabilties, Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross amount recognized, derivative assets	$ 87	$ 97
Gross amount eligible for offsetting, derivative assets	(10)	(11)
Net amount, derivative assets	77	86
Gross amount, derivative liabilities	3,020	2,568
Gross amount eligible for offsetting, derivative liabilities	(10)	(11)
Net Amount, derivative liabilities	$ 3,010	$ 2,557

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities Derivatives, Additional Information (Details) € in Millions, shares in Millions, ¥ in Billions	12 Months Ended
	Sep. 30, 2020USD ($)shares	Sep. 30, 2020EUR (€)	Sep. 30, 2020JPY (¥)	Sep. 30, 2019USD ($)	Sep. 30, 2019EUR (€)	Sep. 30, 2019JPY (¥)	Sep. 30, 2018USD ($)
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 82,000,000			$ (3,000,000)			$ 27,000,000
Derivative Liability, Fair Value, Gross Liability	$ 3,020,000,000			2,568,000,000
Hedge percentage for foreign exchange transactional exposures, Minimum	70.00%	70.00%	70.00%
Hedge percentage for foreign exchange transactional exposures, Maximum	90.00%	90.00%	90.00%
Derivative, amount of hedged ordinary shares | shares	1.4
Gains (Losses) Reclassifed from CTA to Income for Outstanding Net Investment Hedges	$ 0			0			0
Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	3,020,000,000			2,568,000,000
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	0			0
Foreign currency exchange derivatives | Other current liabilities | Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	10,000,000			23,000,000
Foreign currency exchange derivatives | Other current liabilities | Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	0			0
Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | ¥			¥ 25			¥ 25
Equity swap
Derivative [Line Items]
Derivative, Amount of Hedged Item	60,000,000
One billion euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | €		€ 888			€ 888
750 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | €		500			750
423 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | €		423
58 million euro net investment hedge [Member] | Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | €		54			54
500 million euro net investment hedge [Member] [Member] | Foreign Currency Denominated Debt [Member]
Derivative [Line Items]
Notional Amount of Nonderivative Instruments | €		€ 500			€ 423
Net Investment Hedging [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (172,000,000)			$ 145,000,000			$ 45,000,000

Fair Value Measurements Assets

Fair Value Measurements Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions		Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		$ 87	$ 97
Gross amount, derivative liabilities		3,020	2,568
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		441	441
Total liabilities		10	24
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		354	344
Total liabilities		0	0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		87	97
Total liabilities		10	24
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets		0	0
Total liabilities		0	0
Fair Value, Measurements, Recurring | Other noncurrent assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets		63	71
Fair Value, Measurements, Recurring | Other noncurrent assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets		63	71
Fair Value, Measurements, Recurring | Other noncurrent assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets		0	0
Fair Value, Measurements, Recurring | Other noncurrent assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deferred Compensation Plan Assets		0	0
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	19	19
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	19	19
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other current assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	143	138
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	143	138
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Fixed Income Securities [Member] | Other noncurrent assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	129	116
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	129	116
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Equity Securities [Member] | Other noncurrent assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in marketable common stock	[1]	0	0
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		27	35
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		27	35
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		10	23
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		10	23
Fair Value, Measurements, Recurring | Foreign currency exchange derivatives | Other current liabilities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		2	1
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		2	1
Fair Value, Measurements, Recurring | Commodity derivatives | Other current liabilities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount, derivative liabilities		0	0
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		58	62	[1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		0	0	[1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		58	62	[1]
Fair Value, Measurements, Recurring | Equity swap | Other noncurrent assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gross amount recognized, derivative assets		$ 0	$ 0	[1]
[1]	1 Classified as restricted investments for payment of asbestos liabilities. See Note 22, "Commitments and Contingencies" of the notes to consolidated financial statements for further details.

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Disclosure, Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	$ 8,600	$ 7,600
Deferred compensation plan assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	1	(2)
Exchange Traded Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	21	12
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	200	200
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Fair Value Disclosure	$ 8,400	$ 7,400

Stock-based Compensation (Detai

Stock-based Compensation (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)Plan$ / sharesshares	Sep. 30, 2019USD ($)$ / shares	Sep. 30, 2018USD ($)$ / shares	Jan. 23, 2013shares
Stock Based Compensation Activity [Line Items]
Shares authorized for issuance under 2012 Plan (in shares) | shares				76
Shares available for issuance under the 2012 Plan (in shares) | shares	27
Number of share-based compensation plans | Plan	4
Compensation cost charged against income from share-based compensation plans	$ 66	$ 103	$ 89
Total income tax benefit recognized for share-based compensation arrangements	16	26	22
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	1	6	3
Proceeds from the exercise of stock options	$ 75	$ 171	$ 66
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Expiration period for stock options	10 years
Weighted-average grant-date fair value of options granted | $ / shares	$ 7.29	$ 5.56	$ 7.04
Total intrinsic value of options exercised	$ 30	$ 73	$ 38
Proceeds from the exercise of stock options	75	171	66
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 9
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Stock Appreciation Rights (SARs)
Stock Based Compensation Activity [Line Items]
Payments towards exercise of SARs granted	$ 2	$ 3	$ 3
Restricted (Nonvested) Stock
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 81
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 1 month 6 days
Performance Shares
Stock Based Compensation Activity [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 25
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days
Maximum | Employee Stock Option
Stock Based Compensation Activity [Line Items]
Vesting period	3 years
Maximum | Restricted (Nonvested) Stock
Stock Based Compensation Activity [Line Items]
Vesting period	3 years

Stock-based Compensation Assump

Stock-based Compensation Assumptions Used in Black-Scholes Option Valuation Model (Details)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Stock Based Compensation Activity [Line Items]
Risk-free interest rate	1.67%	2.77%	2.28%
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Expected life of option (years)	6 years 6 months	6 years 4 months 24 days	6 years 6 months
Expected volatility of the Company's stock	22.40%	21.80%	23.70%
Expected dividend yield on the Company's stock	2.49%	3.29%	2.78%

Stock-based Compensation Summar

Stock-based Compensation Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Stock Based Compensation Activity [Line Items]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 1	$ 6	$ 3
Compensation cost charged against income from share-based compensation plans	$ 66	$ 103	$ 89
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Option Price, Outstanding beginning balance	$ 28.67
Weighted Average Option Price, Exercised	26.88
Weighted Average Option Price, Forfeited or expired	25.47
Weighted Average Option Price, Outstanding ending balance	30.14	$ 28.67
Weighted Average Option Price, Exercisable	$ 30.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Option, Outstanding beginning balance	368,009
Shares Subject to Option, Exercised	(129,277)
Shares Subject to Option, Forfeited or expired	(26,095)
Shares Subject to Option, Outstanding ending balance	212,637	368,009
Shares Subject to Option, Exercisable	212,637
Weighted Average Remaining Contractual Life (years), Outstanding	1 year 9 months 18 days
Weighted Average Remaining Contractual Life (years), Exercisable	1 year 9 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 2
Aggregate Intrinsic Value, Exercisable	$ 2
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Option Price, Outstanding beginning balance	$ 35.07
Weighted Average Option Price, Granted	41.67
Weighted Average Option Price, Exercised	28.80
Weighted Average Option Price, Forfeited or expired	38.30
Weighted Average Option Price, Outstanding ending balance	37.14	$ 35.07
Weighted Average Option Price, Exercisable	$ 36.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Subject to Option, Outstanding beginning balance	12,369,749
Shares Subject to Option, Granted	1,347,310
Shares Subject to Option, Exercised	(2,504,516)
Shares Subject to Option, Forfeited or expired	(1,097,638)
Shares Subject to Option, Outstanding ending balance	10,114,905	12,369,749
Shares Subject to Option, Exercisable	7,473,203
Weighted Average Remaining Contractual Life (years), Outstanding	4 years 10 months 24 days
Weighted Average Remaining Contractual Life (years), Exercisable	3 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding	$ 46
Aggregate Intrinsic Value, Exercisable	$ 36

Stock-based Compensation Assu_2

Stock-based Compensation Assumptions Used in Black-Scholes Stock Appreciation Rights Valuation Model (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Employee Stock Option
Stock Based Compensation Activity [Line Items]
Weighted Average SAR Price, Forfeited or expired	$ 38.30
Expected life of SAR (years)	6 years 6 months	6 years 4 months 24 days	6 years 6 months
Expected volatility of the Company's stock	22.40%	21.80%	23.70%
Expected dividend yield on the Company's stock	2.49%	3.29%	2.78%
Stock Appreciation Rights (SARs)
Stock Based Compensation Activity [Line Items]
Weighted Average SAR Price, Forfeited or expired	$ 25.47
Risk-free interest rate, minimum	0.11%
Risk-free interest rate, maximum	0.18%
Expected volatility of the Company's stock	22.40%
Expected dividend yield on the Company's stock	2.49%
Stock Appreciation Rights (SARs) | Minimum
Stock Based Compensation Activity [Line Items]
Expected life of SAR (years)	4 months 24 days
Stock Appreciation Rights (SARs) | Maximum
Stock Based Compensation Activity [Line Items]
Expected life of SAR (years)	2 years 6 months

Summary of Nonvested Restricted

Summary of Nonvested Restricted Stock Awards (Details) - Restricted (Nonvested) Stock	12 Months Ended
	Sep. 30, 2020$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Price, Nonvested, Outstanding beginning balance | $ / shares	$ 35.98
Weighted Average Price, Granted | $ / shares	41.38
Weighted Average Price, Vested | $ / shares	37.39
Weighted Average Price, Forfeited | $ / shares	37.47
Weighted Average Price, Nonvested, Outstanding ending balance | $ / shares	$ 38.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares/Units Subject to Restriction, Nonvested, Outstanding beginning balance | shares	3,333,076
Shares/Units Subject to Restriction, Granted | shares	2,053,292
Shares/Units Subject to Restriction, Vested | shares	(1,634,306)
Shares/Units Subject to Restriction, Forfeited | shares	(522,183)
Shares/Units Subject to Restriction, Outstanding ending balance | shares	3,229,879

Stock-based Compensation Summ_2

Stock-based Compensation Summary of Nonvested Performance Share Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.67%	2.77%	2.28%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested share-based compensation arrangements granted	$ 25
Risk-free interest rate	1.60%	2.76%	1.92%
Expected volatility of the Company's stock	21.80%	22.90%	21.70%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Price, Nonvested, Outstanding beginning balance	$ 39.82
Weighted Average Price, Granted	42.48
Weighted Average Price, Vested	44.98
Weighted Average Price, Forfeited	38.87
Weighted Average Price, Nonvested, Outstanding ending balance	$ 39.06	$ 39.82
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares/Units Subject to Restriction, Nonvested, Outstanding beginning balance	1,825,519
Shares/Units Subject to Restriction, Granted	476,939
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(515,975)
Shares/Units Subject to Restriction, Forfeited	(168,539)
Shares/Units Subject to Restriction, Outstanding ending balance	1,617,944	1,825,519
Weighted average period over which unrecognized compensation cost is expected to be recognized	1 year 9 months 18 days

Earnings Per Share (Details)

Earnings Per Share (Details) - $ / shares	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Cash dividends ordinary, per share	$ 1.04	$ 1.04	$ 1.04

Reconciliation of the numerator

Reconciliation of the numerators and denominators (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Available to Ordinary Shareholders
Income from continuing operations	$ 631	$ 1,100	$ 1,175
Income from discontinued operations	0	4,574	987
Basic and diluted income available to shareholders	$ 631	$ 5,674	$ 2,162
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	751	870.2	925.7
Stock options, unvested restricted stock and unvested performance share awards	2.6	4.1	6
Diluted weighted average shares outstanding	753.6	874.3	931.7
Antidilutive Securities
Options to purchase common shares	1.4	1.4	1.5

Equity and Noncontrolling Int_3

Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Equity [Line Items]
Deferred tax asset from stock options exercised and restricted stock vestings	$ 179
Stock repurchase program, authorized amount					$ 8,500
Payments for Repurchase of Common Stock		$ 2,204	$ 5,983	$ 300
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	20,447	19,766	21,164	20,447
Beginning balance		1,063
Beginning balance		20,829
Net income		631	5,674	2,162
Foreign currency translation adjustments		25	(342)	(483)
Realized and unrealized gains (losses) on derivatives		8	6	(29)
Realized and unrealized gains on marketable securities		0	0	4
Pension and postretirement plans		8	(6)	0
Other comprehensive income (loss)		41	(342)	(508)
Comprehensive income attributable to Johnson Controls		650	5,350	1,689
Comprehensive income attributable to noncontrolling interests		186	195	186
Total comprehensive income		836	5,545	1,875
Cash dividends - ordinary shares		(780)	(887)	(968)
Repurchases of ordinary shares			(5,983)	(300)
Other, including options exercised		(103)	(230)	(117)
Ending balance		17,447	19,766	$ 21,164
Ending balance		1,086	1,063
Ending balance		$ 18,533	$ 20,829
Cash dividends ordinary, per share		$ 1.04	$ 1.04	$ 1.04
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		$ (83)
Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	20,447	19,766	$ 21,164	$ 20,447
Net income		631	5,674	2,162
Foreign currency translation adjustments		7	(325)	(458)
Realized and unrealized gains (losses) on derivatives		4	7	(19)
Realized and unrealized gains on marketable securities				4
Pension and postretirement plans		8	(6)
Other comprehensive income (loss)		19	(324)	(473)
Comprehensive income attributable to Johnson Controls		650	5,350	1,689
Cash dividends - ordinary shares		(780)	(887)	(968)
Dividends attributable to noncontrolling interests		0	0	0
Repurchases of ordinary shares		(2,204)	(5,983)	(300)
Change in noncontrolling interest share				0
Noncontrolling Interest, Change in Redemption Value				0
Other, including options exercised		103	230	117
Ending balance		17,447	19,766	21,164
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(83)
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	920	1,063	1,294	920
Net income		164	213	186
Foreign currency translation adjustments		18	(17)	(22)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Noncontrolling Interest		4	(1)	(1)
Realized and unrealized gains on marketable securities				0
Pension and postretirement plans		0	0
Other comprehensive income (loss)		22	(18)	(23)
Comprehensive income attributable to noncontrolling interests		186	195	163
Cash dividends - ordinary shares		0	0	0
Dividends attributable to noncontrolling interests		(114)	(132)	(43)
Repurchases of ordinary shares		0	0	0
Change in noncontrolling interest share				23
Noncontrolling Interest, Change in Redemption Value				231
Other, including options exercised		0	1	0
Ending balance		1,086	1,063	1,294
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(49)
Stockholders' Equity, Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	21,367	20,829	22,458	21,367
Net Income		795	5,887	2,348
Foreign currency translation adjustments		25	(342)	(480)
Realized and unrealized gains (losses) on derivatives		8	6	(20)
Realized and unrealized gains on marketable securities				4
Pension and postretirement plans		8	(6)
Other comprehensive income (loss)		41	(342)	(496)
Total comprehensive income		836	5,545	1,852
Cash dividends - ordinary shares		(780)	(887)	(968)
Dividends attributable to noncontrolling interests		(114)	(132)	(43)
Repurchases of ordinary shares		(2,204)	(5,983)	(300)
Change in noncontrolling interest share				23
Noncontrolling Interest, Change in Redemption Value				231
Other, including options exercised		103	231	117
Ending balance		18,533	20,829	22,458
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		(132)
Power Solutions
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Realized and unrealized gains (losses) on derivatives		0	4	0
Divestiture of Power Solutions			(483)
Power Solutions | Parent
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			483
Power Solutions | Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			(295)
Power Solutions | Stockholders' Equity, Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Divestiture of Power Solutions			188
Adoption of ASC 606 | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(45)
Ending balance				(45)
Adoption of ASC 606 | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(45)
Ending balance				(45)
Adoption of ASC 606 | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			0
Ending balance				0
Adoption of ASC 606 | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(45)
Ending balance				(45)
Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(5)
Ending balance			(5)
Adoption of ASC 842 | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(5)
Ending balance			(5)
Adoption of ASC 842 | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		0
Ending balance			0
Adoption of ASC 842 | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		$ (5)
Ending balance			(5)
Accounting Standards Update 2016-09 [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(179)			(179)
Accounting Standards Update 2016-09 [Member] | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	179			179
Accounting Standards Update 2016-09 [Member] | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0			0
Accounting Standards Update 2016-09 [Member] | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 179			179
Accounting Standards Update 2016-16 Member [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(546)
Ending balance				(546)
Accounting Standards Update 2016-16 Member [Member] | Parent | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(546)
Ending balance				(546)
Accounting Standards Update 2016-16 Member [Member] | Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			0
Ending balance				0
Accounting Standards Update 2016-16 Member [Member] | Stockholders' Equity, Total | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ (546)
Ending balance				$ (546)

Equity and Noncontrolling Int_4

Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount				$ 8,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,400
Stock Repurchased and Retired During Period, Value	2,204
Repurchases of ordinary shares		$ 5,983	$ 300
Stock Repurchased and Retired During Period Value Tender Offer		4,035
Stock Repurchased and Retired During Period Value Open Market		1,948
Parent
Equity, Class of Treasury Stock [Line Items]
Repurchases of ordinary shares	2,204	5,983	300
Stockholders' Equity, Total
Equity, Class of Treasury Stock [Line Items]
Repurchases of ordinary shares	$ 2,204	$ 5,983	$ 300

Equity and Noncontrolling Int_5

Equity and Noncontrolling Interests Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Realized and unrealized gains (losses) on derivatives	$ 8	$ 6	$ (29)
Other, including options exercised	(103)	(230)	(117)
Redeemable Noncontrolling Interests
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Beginning balance		0	211
Net income			35
Foreign currency translation adjustments			(3)
Realized and unrealized gains (losses) on derivatives			(9)
Dividends			(3)
Noncontrolling Interest, Change in Redemption Value			(231)
Ending balance			0
Parent
Increase (Decrease) in Redeemable Noncontrolling Interests [Roll Forward]
Realized and unrealized gains (losses) on derivatives	4	7	(19)
Noncontrolling Interest, Change in Redemption Value			0
Other, including options exercised	$ 103	$ 230	$ 117

Equity and Noncontrolling Int_6

Equity and Noncontrolling Interests Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive loss, end of period		$ (776)	$ (795)	$ (946)
Realized and unrealized gains (losses) on derivatives
Divestiture of Power Solutions		8	6	(29)
Realized and unrealized gains (losses) on marketable securities
Reclassification to income	[1]	0	0	(1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax		0	0	(1)
Pension and postretirement plans
Stock repurchase program, authorized amount					$ 8,500
Proceeds from Sale and Maturity of Marketable Securities				3
Marketable Securities, Realized Gain (Loss)				2
Foreign Currency Translation
Foreign currency translation adjustments
Balance at beginning of period		(785)	(939)	(481)
Aggregate adjustment for the period	[2]	7	(325)	(458)
Balance at end of period		(778)	(785)	(939)
Aggregate adjustment for the period, tax		1	0	(3)
Realized And Unrealized Gains Losses On Derivatives
Realized and unrealized gains (losses) on derivatives
Balance at beginning of period		(2)	(13)	6
Current period changes in fair value		3	(1)	(8)
Reclassification to income	[3]	1	8	(11)
Balance at end of period		2	(2)	(13)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax		0	2	(5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax		1	(1)	(4)
Unrealized Gain Loss On Marketable Securities
Realized and unrealized gains (losses) on marketable securities
Balance at beginning of period		0	8	4
Current period changes in fair value		0	0	5
Balance at end of period		0	0	8
Current period changes in fair value, tax		0	0	1
Pension And Other Postretirement Benefit Plans Assets
Pension and postretirement plans
Balance at beginning of period		(8)	(2)	(2)
Balance at end of period		0	(8)	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax		1	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax		9	(6)	0
Reclassification to income, tax		(1)	0	0
Other changes (tax)		4	0	0
Power Solutions
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		0	479	0
Realized and unrealized gains (losses) on derivatives
Divestiture of Power Solutions		0	4	0
Pension and postretirement plans
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		0	479	0
Power Solutions | Realized And Unrealized Gains Losses On Derivatives
Realized and unrealized gains (losses) on derivatives
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax		0	1	0
Scott Safety business [Member]
Foreign currency translation adjustments
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax				12
Pension and postretirement plans
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax				12
Accounting Standards Update 2016-01 [Member]
Realized and unrealized gains (losses) on marketable securities
Balance at beginning of period			8
Balance at end of period				8
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01 [Member]
Realized and unrealized gains (losses) on marketable securities
Balance at beginning of period	[4]	$ 0	(8)	0
Balance at end of period	[4]		$ 0	$ (8)
[1]	During fiscal 2018, the Company sold certain marketable common stock for approximately $3 million. As a result, the Company recorded $2 million of realized gains within selling, general and administrative expenses.
[2]	During fiscal 2018, $12 million of cumulative CTA was recognized as part of the divestiture-related gain recognized as part of the divestiture of Scott Safety.
[3]	Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to 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.
[4]	The Company adopted ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" effective October 1, 2018 and, as a result, reclassified $8 million of unrealized gains on marketable securities to retained earnings.

Retirement Plans (Details)

Retirement Plans (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)Person	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
Retirement Plans [Line Items]
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate projected benefit obligation	$ 5,598	$ 5,450
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate accumulated benefit obligation	5,539	5,388
Defined benefit plan, pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets	4,528	4,484
Total employer and employee contributions to defined benefit plans	58
Voluntary contributions made by the company to defined benefit plans	0
Estimated future employer contributions to defined benefit plans in next fiscal year	46
Projected prescription drug subsidy receipts per year over the next ten years	1
Matching contributions charged to expense for defined contribution savings plans	$ 104	198	$ 205
Number of multiemployer benefit plans in which the Company participates | Person	280
Multiemployer Plan, Employer Contribution, Cost	$ 66	69	68
Postretirement Benefits
Retirement Plans [Line Items]
Defined Benefit Plan, Benefit Obligation	146	$ 174	$ 196
Total employer and employee contributions to defined benefit plans	3
Estimated future employer contributions to defined benefit plans in next fiscal year	$ 3

Retirement Plans Projected Bene

Retirement Plans Projected Benefit Payments from Plans (Details) $ in Millions	Sep. 30, 2020USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions to defined benefit plans in next fiscal year	$ 46
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2021	323
2022	301
2023	307
2024	309
2025	309
2026-2030	1,516
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Estimated future employer contributions to defined benefit plans in next fiscal year	3
2021	13
2022	12
2023	12
2024	12
2025	11
2026-2030	$ 45

Plan Assets by Asset Category (

Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	$ 2,706	$ 2,736	$ 3,046
Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	2,213	2,098	2,117
Pension Plan | Due to Broker | United States
Retirement Plans [Line Items]
Fair value of plan assets	(80)
Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	153	163	$ 174
Postretirement Benefits | Cash and cash equivalents
Retirement Plans [Line Items]
Fair value of plan assets	5	6
Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	23	22
Postretirement Benefits | Small-Cap
Retirement Plans [Line Items]
Fair value of plan assets	7	8
Postretirement Benefits | International-Developed
Retirement Plans [Line Items]
Fair value of plan assets	16	19
Postretirement Benefits | International - Emerging
Retirement Plans [Line Items]
Fair value of plan assets	10	9
Postretirement Benefits | Government
Retirement Plans [Line Items]
Fair value of plan assets	19	20
Postretirement Benefits | Corporate/Other
Retirement Plans [Line Items]
Fair value of plan assets	53	55
Postretirement Benefits | Real Estate
Retirement Plans [Line Items]
Fair value of plan assets	8	11
Postretirement Benefits | Commodities
Retirement Plans [Line Items]
Fair value of plan assets	12	13
Fair Value, Inputs, Level 1 | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	2,251	2,175
Fair Value, Inputs, Level 1 | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	665	641
Fair Value, Inputs, Level 1 | Pension Plan | Cash and cash equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	24
Fair Value, Inputs, Level 1 | Pension Plan | Cash and cash equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	178	174
Fair Value, Inputs, Level 1 | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	198	276
Fair Value, Inputs, Level 1 | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	23	23
Fair Value, Inputs, Level 1 | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	255	232
Fair Value, Inputs, Level 1 | Pension Plan | International-Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	220	233
Fair Value, Inputs, Level 1 | Pension Plan | International-Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	52	54
Fair Value, Inputs, Level 1 | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	33	42
Fair Value, Inputs, Level 1 | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	1
Fair Value, Inputs, Level 1 | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	159	47
Fair Value, Inputs, Level 1 | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	64	69
Fair Value, Inputs, Level 1 | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	1,386	1,266
Fair Value, Inputs, Level 1 | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	321	289
Fair Value, Inputs, Level 1 | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets		55
Fair Value, Inputs, Level 1 | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	27	31
Fair Value, Inputs, Level 1 | Pension Plan | Hedge Funds | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	5	6
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash and cash equivalents
Retirement Plans [Line Items]
Fair value of plan assets	5	6
Fair Value, Inputs, Level 1 | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | Small-Cap
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | International-Developed
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | International - Emerging
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | Government
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | Corporate/Other
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | Real Estate
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 1 | Postretirement Benefits | Commodities
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	259	359
Significant Other Observable Inputs (Level 2) | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	1,532	1,443
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and cash equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	36	31
Significant Other Observable Inputs (Level 2) | Pension Plan | Cash and cash equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	334	191
Significant Other Observable Inputs (Level 2) | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | International-Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	33
Significant Other Observable Inputs (Level 2) | Pension Plan | International-Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	174	235
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	10
Significant Other Observable Inputs (Level 2) | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	4	11
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	223	285
Significant Other Observable Inputs (Level 2) | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	640	709
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	331	228
Significant Other Observable Inputs (Level 2) | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets		0
Significant Other Observable Inputs (Level 2) | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Pension Plan | Hedge Funds | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	49	69
Significant Other Observable Inputs (Level 2) | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	148	157
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash and cash equivalents
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	23	22
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap
Retirement Plans [Line Items]
Fair value of plan assets	7	8
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed
Retirement Plans [Line Items]
Fair value of plan assets	16	19
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging
Retirement Plans [Line Items]
Fair value of plan assets	10	9
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government
Retirement Plans [Line Items]
Fair value of plan assets	19	20
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other
Retirement Plans [Line Items]
Fair value of plan assets	53	55
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate
Retirement Plans [Line Items]
Fair value of plan assets	8	11
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities
Retirement Plans [Line Items]
Fair value of plan assets	12	13
Fair Value, Inputs, Level 3 | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Cash and cash equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Cash and cash equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | International-Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | International-Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets		0
Fair Value, Inputs, Level 3 | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Pension Plan | Hedge Funds | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Cash and cash equivalents
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Large-Cap
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Small-Cap
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | International-Developed
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | International - Emerging
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Government
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Corporate/Other
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Real Estate
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value, Inputs, Level 3 | Postretirement Benefits | Commodities
Retirement Plans [Line Items]
Fair value of plan assets	0	0
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets	276	202
Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	16	14
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | United States
Retirement Plans [Line Items]
Fair value of plan assets	2,510	2,534
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	2,197	2,084
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Cash and cash equivalents | United States
Retirement Plans [Line Items]
Fair value of plan assets	36	55
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Cash and cash equivalents | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	178	174
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Large-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	198	276
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Large-Cap | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	357	214
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Small-Cap | United States
Retirement Plans [Line Items]
Fair value of plan assets	255	232
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International-Developed | United States
Retirement Plans [Line Items]
Fair value of plan assets	220	266
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International-Developed | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	226	289
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International - Emerging | United States
Retirement Plans [Line Items]
Fair value of plan assets	33	52
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | International - Emerging | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	4	12
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Government | United States
Retirement Plans [Line Items]
Fair value of plan assets	382	332
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Government | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	704	778
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Corporate/Other | United States
Retirement Plans [Line Items]
Fair value of plan assets	1,386	1,266
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Corporate/Other | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	652	517
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Real Estate | United States
Retirement Plans [Line Items]
Fair value of plan assets		55
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Real Estate | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	27	31
Fair Value, Inputs, Level 1, 2 and 3 [Member] | Pension Plan | Hedge Funds | Foreign Plan
Retirement Plans [Line Items]
Fair value of plan assets	$ 49	$ 69

Retirement Plans Accumulated Be

Retirement Plans Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Pension Plan | Foreign Plan
Retirement Plans [Line Items]
Accumulated Benefit Obligation		$ 2,627	$ 2,549
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year		2,652	2,542
Service cost		25	22	$ 23
Interest cost		36	54	57
Plan participant contributions		3	2
Actuarial (gain) loss		7	337
Amendments made during the year		0	26
Estimated subsidy received		0	0
Curtailment		(8)	0
Other		4	(2)
Currency translation adjustment		118	(109)
Projected benefit obligation at end of year		2,726	2,652	2,542
Change in Plan Assets
Fair value of plan assets at beginning of year		2,098	2,117
Actual return on plan assets		75	203
Employer and employee contributions		56	50
Benefits paid		(73)	(76)
Settlement payments		(36)	(50)
Other		0	(2)
Currency translation adjustment		93	(95)
Fair value of plan assets at end of year		2,213	2,098	2,117
Funded status		(513)	(554)
Net amount recognized		$ (513)	$ (554)
Weighted Average Assumptions
Discount rate	[1]	1.35%	1.50%
Rate of compensation increase		2.75%	2.80%
Defined Benefit Plan, Total Plan Assets		$ 2,213	$ 2,098
Pension Plan | United States
Retirement Plans [Line Items]
Accumulated Benefit Obligation		3,217	3,115
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year		3,115	3,191
Service cost		0	8	15
Interest cost		67	108	105
Plan participant contributions		0	0
Actuarial (gain) loss		298	441
Amendments made during the year		0	0
Estimated subsidy received		0	0
Curtailment		0	0
Other		0	0
Currency translation adjustment		0	0
Projected benefit obligation at end of year		3,217	3,115	3,191
Change in Plan Assets
Fair value of plan assets at beginning of year		2,736	3,046
Actual return on plan assets		228	266
Employer and employee contributions		5	38
Benefits paid		(112)	(136)
Settlement payments		(151)	(107)
Other		0	0
Currency translation adjustment		0	0
Fair value of plan assets at end of year		2,706	2,736	3,046
Funded status		(511)	(379)
Net amount recognized		$ (511)	$ (379)
Weighted Average Assumptions
Discount rate	[1]	2.25%	2.95%
Defined Benefit Plan, Total Plan Assets		$ 2,706	$ 2,736
Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		641
Fair value of plan assets at end of year		665	641
Pension Plan | Fair Value, Inputs, Level 1 | United States
Change in Plan Assets
Fair value of plan assets at beginning of year		2,175
Fair value of plan assets at end of year		2,251	2,175
Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		1,443
Fair value of plan assets at end of year		1,532	1,443
Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States
Change in Plan Assets
Fair value of plan assets at beginning of year		359
Fair value of plan assets at end of year		259	359
Postretirement Benefits
Retirement Plans [Line Items]
Accumulated Benefit Obligation		0	0
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year		174	196
Service cost		1	1	2
Interest cost		4	6	7
Plan participant contributions		4	6
Actuarial (gain) loss		(3)	15
Amendments made during the year		(13)	(19)
Estimated subsidy received		1	1
Curtailment		0	0
Other		0	0
Currency translation adjustment		(1)	0
Projected benefit obligation at end of year		146	174	196
Change in Plan Assets
Fair value of plan assets at beginning of year		163	174
Actual return on plan assets		4	7
Employer and employee contributions		7	9
Benefits paid		(21)	(23)
Settlement payments		0	0
Other		0	0
Currency translation adjustment		0	0
Fair value of plan assets at end of year		153	163	$ 174
Funded status		7	(11)
Net amount recognized		$ 7	$ (11)
Weighted Average Assumptions
Discount rate	[1]	1.90%	2.65%
Defined Benefit Plan, Total Plan Assets		$ 153	$ 163
Postretirement Benefits | Fair Value, Inputs, Level 1
Change in Plan Assets
Fair value of plan assets at beginning of year		6
Fair value of plan assets at end of year		5	6
Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets
Fair value of plan assets at beginning of year		157
Fair value of plan assets at end of year		148	157
Other noncurrent assets | Pension Plan | Foreign Plan
Change in Projected Benefit Obligation
Benefits and settlements paid		(109)	(126)
Other noncurrent assets | Pension Plan | United States
Change in Projected Benefit Obligation
Benefits and settlements paid		(263)	(243)
Other noncurrent assets | Postretirement Benefits
Change in Projected Benefit Obligation
Benefits and settlements paid		(21)	(23)
Power Solutions | Pension Plan | Foreign Plan
Change in Projected Benefit Obligation
Power Solutions divestiture		0	(86)
Change in Plan Assets
Power Solutions divestiture		0	(45)
Power Solutions | Pension Plan | United States
Change in Projected Benefit Obligation
Power Solutions divestiture		0	(390)
Change in Plan Assets
Power Solutions divestiture		0	(371)
Power Solutions | Postretirement Benefits
Change in Projected Benefit Obligation
Power Solutions divestiture		0	(9)
Change in Plan Assets
Power Solutions divestiture		0	(4)
Business Divestitures, Not Specific | Pension Plan | Foreign Plan
Change in Projected Benefit Obligation
Power Solutions divestiture		(2)	(8)
Change in Plan Assets
Power Solutions divestiture		0	(4)
Business Divestitures, Not Specific | Pension Plan | United States
Change in Projected Benefit Obligation
Power Solutions divestiture		0	0
Change in Plan Assets
Power Solutions divestiture		0	0
Business Divestitures, Not Specific | Postretirement Benefits
Change in Projected Benefit Obligation
Power Solutions divestiture		0	0
Change in Plan Assets
Power Solutions divestiture		0	0
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0	0
Hedge Funds | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		69
Fair value of plan assets at end of year		49	69
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		174
Fair value of plan assets at end of year		178	174
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 1 | United States
Change in Plan Assets
Fair value of plan assets at beginning of year		24
Fair value of plan assets at end of year		0	24
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | Foreign Plan
Change in Plan Assets
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0	0
Cash and cash equivalents | Pension Plan | Fair Value, Inputs, Level 2 [Member] | United States
Change in Plan Assets
Fair value of plan assets at beginning of year		31
Fair value of plan assets at end of year		36	31
Cash and cash equivalents | Postretirement Benefits
Change in Plan Assets
Fair value of plan assets at beginning of year		6
Fair value of plan assets at end of year		5	6
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 1
Change in Plan Assets
Fair value of plan assets at beginning of year		6
Fair value of plan assets at end of year		5	6
Cash and cash equivalents | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0	0
Commodities | Postretirement Benefits
Change in Plan Assets
Fair value of plan assets at beginning of year		13
Fair value of plan assets at end of year		12	13
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 1
Change in Plan Assets
Fair value of plan assets at beginning of year		0
Fair value of plan assets at end of year		0	0
Commodities | Postretirement Benefits | Fair Value, Inputs, Level 2 [Member]
Change in Plan Assets
Fair value of plan assets at beginning of year		13
Fair value of plan assets at end of year		12	13
Continuing Operations [Member] | Pension Plan | Foreign Plan
Change in Projected Benefit Obligation
Service cost		25	22
Interest cost		36	54
Change in Plan Assets
Prepaid benefit cost		29	25
Accrued benefit liability		(542)	(579)
Continuing Operations [Member] | Pension Plan | United States
Change in Plan Assets
Prepaid benefit cost		32	30
Accrued benefit liability		(543)	(409)
Continuing Operations [Member] | Postretirement Benefits
Change in Plan Assets
Prepaid benefit cost		78	66
Accrued benefit liability		$ (71)	$ (77)
[1]	The Company considers the expected benefit payments on a plan-by-plan basis when setting assumed discount rates. As a result, the Company uses different discount rates for each plan depending on the plan jurisdiction, the demographics of participants and the expected timing of benefit payments. For the U.S. pension and postretirement plans, the Company uses a discount rate provided by an independent third party calculated based on an appropriate mix of high quality bonds. For the non-U.S. pension and postretirement plans, the Company consistently uses the relevant country specific benchmark indices for determining the various discount rates. The Company has elected to utilize a full yield curve approach in the estimation of service and interest components of net periodic benefit cost (credit) for pension and other postretirement for plans that utilize a yield curve approach. The full yield curve approach applies the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows.

Amounts in Accumulated Other Co

Amounts in Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost over Next Fiscal Year (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Retirement Plans [Line Items]
Amounts in AOCI, exclusive of tax impacts, that have not been recognized as components of net periodic benefit cost (credit)	$ (5)	$ 6

Retirement Plans Components of

Retirement Plans Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Pension Plan | United States
Components of Net Periodic Benefit Cost:
Service cost	$ 0	$ 8	$ 15
Interest cost	67	108	105
Expected return on plan assets	(180)	(199)	(229)
Net actuarial (gain) loss	244	361	7
Amortization of prior service cost (credit)	0	0	0
Curtailment gain	0	0	0
Settlement loss	6	13	0
Net periodic benefit cost (credit)	$ 137	$ 291	$ (102)
Expense Assumptions:
Discount rate	2.95%	4.10%	3.80%
Expected return on plan assets	6.90%	7.10%	7.50%
Rate of compensation increase		3.50%	3.20%
Pension Plan | Foreign Plan
Components of Net Periodic Benefit Cost:
Service cost	$ 25	$ 22	$ 23
Interest cost	36	54	57
Expected return on plan assets	(111)	(105)	(114)
Net actuarial (gain) loss	43	236	(22)
Amortization of prior service cost (credit)	1	0	0
Curtailment gain	(8)	0	(2)
Settlement loss	0	4	0
Net periodic benefit cost (credit)	$ (14)	$ 211	$ (58)
Expense Assumptions:
Discount rate	1.50%	2.45%	2.40%
Expected return on plan assets	5.20%	5.20%	5.35%
Rate of compensation increase	2.80%	2.95%	2.90%
Postretirement Benefits
Components of Net Periodic Benefit Cost:
Service cost	$ 1	$ 1	$ 2
Interest cost	4	6	7
Expected return on plan assets	(9)	(9)	(10)
Net actuarial (gain) loss	2	17	5
Amortization of prior service cost (credit)	(3)	0	0
Curtailment gain	0	0	0
Settlement loss	0	0	0
Net periodic benefit cost (credit)	$ (5)	$ 15	$ 4
Expense Assumptions:
Discount rate	2.65%	3.80%	3.70%
Expected return on plan assets	5.70%	5.65%	5.65%
Discontinued Operations | Pension Plan | United States
Components of Net Periodic Benefit Cost:
Net periodic benefit cost (credit)	$ 0	$ (2)	$ (5)
Discontinued Operations | Pension Plan | Foreign Plan
Components of Net Periodic Benefit Cost:
Net periodic benefit cost (credit)	0	0	(7)
Discontinued Operations | Postretirement Benefits
Components of Net Periodic Benefit Cost:
Net periodic benefit cost (credit)	0	0	(2)
Continuing Operations [Member] | Pension Plan | United States
Components of Net Periodic Benefit Cost:
Net periodic benefit cost (credit)	137	289	(107)
Continuing Operations [Member] | Pension Plan | Foreign Plan
Components of Net Periodic Benefit Cost:
Service cost	25	22
Interest cost	36	54
Net periodic benefit cost (credit)	(14)	211	(65)
Continuing Operations [Member] | Postretirement Benefits
Components of Net Periodic Benefit Cost:
Net periodic benefit cost (credit)	$ (5)	$ 15	$ 2

Significant Restructuring and_3

Significant Restructuring and Impairment Costs (Detail) $ in Millions	3 Months Ended				12 Months Ended				48 Months Ended
	Sep. 30, 2020USD ($)PlantEmployees	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2020USD ($)PlantEmployees	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2020USD ($)PlantEmployees
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					$ 783	$ 235	$ 255
Number of employees to be severed | Employees									16,400
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date | Employees	12,700				12,700				12,700
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant					9
Number Of Plants Closed | Plant	8				8				8
Goodwill, Impairment Loss	$ 0			$ 0	$ 424	0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0		$ 62	0	$ 62
Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring And Related Cost Expected Number Of Plants To Be Closed | Plant					9
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					$ 5		50
2020 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					297
Payments for Restructuring					(95)
Restructuring Reserve, Settled without Cash					(96)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					2
Restructuring Reserve	108				108				$ 108
2020 Restructuring Plan [Member] | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					196
Payments for Restructuring					(92)
Restructuring Reserve, Settled without Cash					0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					2
Restructuring Reserve	106				106				106
2020 Restructuring Plan [Member] | Fixed Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					96
Payments for Restructuring					0
Restructuring Reserve, Settled without Cash					(96)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					0
Restructuring Reserve	0				0				0
2020 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					5
Payments for Restructuring					(3)
Restructuring Reserve, Settled without Cash					0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					0
Restructuring Reserve	2				2				2
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							263
Payments for Restructuring					(69)	(67)	(47)
Restructuring Reserve, Settled without Cash							(42)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					1	(1)
Restructuring Reserve	30			102	30	102	174		30
2018 Restructuring Plan [Member] | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					(4)
2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							255
2018 Restructuring Plan [Member] | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							209
Payments for Restructuring					(69)	(61)	(45)
Restructuring Reserve, Settled without Cash							0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					1	(1)
Restructuring Reserve	30			98	30	98	164		30
2018 Restructuring Plan [Member] | Employee Severance | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					0
2018 Restructuring Plan [Member] | Fixed Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							42
Payments for Restructuring					0	0	0
Restructuring Reserve, Settled without Cash							(42)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					0	0
Restructuring Reserve	0			0	0	0	0		0
2018 Restructuring Plan [Member] | Fixed Asset Impairment | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					0
2018 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							12
Payments for Restructuring					0	(6)	(2)
Restructuring Reserve, Settled without Cash							0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)					0	0
Restructuring Reserve	0			4	0	4	10		0
2018 Restructuring Plan [Member] | Other Restructuring [Member] | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					(4)
2018 Restructuring Plan [Member] | Power Solutions | Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							8
2018 Restructuring Plan [Member] | Power Solutions | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						(4)
2018 Restructuring Plan [Member] | Power Solutions | Employee Severance | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						(4)
2018 Restructuring Plan [Member] | Power Solutions | Fixed Asset Impairment | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						0
2018 Restructuring Plan [Member] | Power Solutions | Other Restructuring [Member] | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						0
2017 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								$ 367
Payments for Restructuring					(50)	(13)	(158)	(75)
Restructuring Reserve, Settled without Cash								(78)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)						(3)	(1)
Adjustment to restructuring reserves								25
Restructuring Reserve	6			61	6	61	80	239	6
2017 Restructuring Plan [Member] | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					5
2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								347
2017 Restructuring Plan [Member] | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								276
Payments for Restructuring					(50)	(11)	(152)	(75)
Restructuring Reserve, Settled without Cash								0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)						(3)	(1)
Adjustment to restructuring reserves								25
Restructuring Reserve	6			56	6	56	73	226	6
2017 Restructuring Plan [Member] | Employee Severance | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					0
2017 Restructuring Plan [Member] | Fixed Asset Impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								77
Payments for Restructuring					0	0	0	0
Restructuring Reserve, Settled without Cash								(77)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)						0	0
Adjustment to restructuring reserves								0
Restructuring Reserve	0			0	0	0	0	0	0
2017 Restructuring Plan [Member] | Fixed Asset Impairment | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					0
2017 Restructuring Plan [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								14
Payments for Restructuring					0	(2)	(6)	0
Restructuring Reserve, Settled without Cash								(1)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)						0	0
Adjustment to restructuring reserves								0
Restructuring Reserve	$ 0			$ 5	0	5	7	13	$ 0
2017 Restructuring Plan [Member] | Other Restructuring [Member] | Adoption of ASC 842
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment					5
2017 Restructuring Plan [Member] | Power Solutions | Discontinued Operations
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								20
2017 Restructuring Plan [Member] | Power Solutions | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						(3)
2017 Restructuring Plan [Member] | Power Solutions | Employee Severance | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						(3)
2017 Restructuring Plan [Member] | Power Solutions | Fixed Asset Impairment | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						0
2017 Restructuring Plan [Member] | Power Solutions | Other Restructuring [Member] | Transfer To Held for Sale [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Settled without Cash						0
Building Solutions Asia Pacific | Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					56		16
Goodwill, Impairment Loss					0	0
Building Solutions Asia Pacific | 2020 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					49
Building Solutions Asia Pacific | 2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							16
Building Solutions Asia Pacific | 2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								16
Corporate | 2020 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					5
Corporate | 2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							50
Corporate | 2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								166
Building Solutions EMEA/LA | Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					59		56
Goodwill, Impairment Loss					0	0
Building Solutions EMEA/LA | 2020 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					43
Building Solutions EMEA/LA | 2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							56
Building Solutions EMEA/LA | 2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								74
Building Solutions North America
Restructuring Cost and Reserve [Line Items]
Goodwill, Impairment Loss					424
Building Solutions North America | Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					520		20
Goodwill, Impairment Loss		$ 424			424	0
Building Solutions North America | 2020 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					64
Building Solutions North America | 2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							20
Building Solutions North America | 2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								59
Global Products | Building Technologies & Solutions
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					143	235	113
Goodwill, Impairment Loss					0	$ 0
Global Products | 2020 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs					$ 136
Global Products | 2018 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs							$ 113
Global Products | 2017 Restructuring Plan [Member] | Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment costs								$ 32

Impairment of Long-Lived Asse_2

Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended			24 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2020
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			$ 582	$ 235	$ 36
Impairment of Long-Lived Assets Held-for-use			$ 81
Document Period End Date			Sep. 30, 2020
Building Solutions Asia Pacific
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 24
Building Solutions North America
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use			15
Global Products
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 15	$ 235		$ 235		$ 250
Impairment of Long-Lived Assets Held-for-use			$ 42
2018 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					36
2018 Restructuring Plan [Member] | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					31
2018 Restructuring Plan [Member] | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					6
2018 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges					$ 5

Income Taxes Significant Compon

Income Taxes Significant Components of Company's Income Tax Provision from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Components of Income Tax [Line Items]
Tax expense at Ireland statutory rate					$ 113	$ 132	$ 193
U.S. state income tax, net of federal benefit					8	15	15
Income subject to the U.S. federal tax rate					(92)	(110)	39
Income subject to rates different than the statutory rate					99	38	(201)
Reserve and valuation allowance adjustments		$ 30	$ (76)		(70)	(284)	31
Impact of acquisitions and divestitures					0	0	16
U.S. Tax Reform discrete items					0	0	108
Restructuring and impairment costs					50	(24)	(4)
Income tax provision					$ 108	$ (233)	$ 197
Ireland statutory rate						12.50%	12.50%
Effective Income Tax Rate Reconciliation, Percent					12.00%
Valuation Allowance, Deferred Tax Asset, Increase, Amount	$ 26			$ 56
Unrecognized Tax Benefit Resulting From Tax Audit Resolution					$ 44
IRELAND
Components of Income Tax [Line Items]
Ireland statutory rate					12.50%

Income Taxes Reconciliation of

Income Taxes Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Beginning balance	$ 2,451	$ 2,358	$ 2,161
Additions for tax positions related to the current year	128	433	435
Additions for tax positions of prior years	129	347	7
Reductions for tax positions of prior years	(27)	(88)	(201)
Settlements with taxing authorities	(54)	0	(19)
Statute closings and audit resolutions	(99)	(599)	(25)
Ending balance	$ 2,528	$ 2,451	$ 2,358

Income Taxes Components of Prov

Income Taxes Components of Provision for Income Taxes on Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Current
U.S. federal	$ 309	$ (1,025)	$ 476
U.S. state	72	(33)	26
Non-U.S.	264	213	434
Total	645	(845)	936
Deferred
U.S. federal	(382)	412	(372)
U.S. state	(43)	84	(10)
Non-U.S.	(112)	116	(357)
Total	(537)	612	(739)
Income tax provision	108	(233)	197
Income from Continuing Operations before Income Taxes, Domestic	(385)	(259)	261
Income from Continuing Operations before Income Taxes, Foreign	1,288	1,315	1,285
Income Taxes Paid, Net	(386)	377	$ 81
Income Taxes Receivable, Current	252	1,069
Taxes Payable, Current	243	$ 159
Undistributed Earnings of Foreign Subsidiaries	$ 22,000

Income Taxes Deferred Taxes Cla

Income Taxes Deferred Taxes Classified in Consolidated Statements of Financial Position (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	$ 862	$ 552
Deferred Tax Liabilities, Net, Noncurrent	385	588
Deferred Tax Assets (Liabilities), Net	$ 477
Deferred Income Tax Liabilities, Net		$ (36)

Income Taxes Temporary Differen

Income Taxes Temporary Differences And Carryforwards in Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets
Accrued expenses and reserves	$ 474	$ 437
Employee and retiree benefits	286	265
Deferred Tax Assets, Property, Plant and Equipment	182	0
Net operating loss and other credit carryforwards	6,306	5,664
Research and development	112	106
Other, net	99	0
Gross deferred tax assets	7,459	6,472
Valuation allowances	(5,518)	(5,068)
Net deferred tax assets	1,941	1,404
Deferred tax liabilities
Property, plant and equipment	0	139
Joint ventures and partnerships	730	499
Intangible assets	734	759
Other, net	0	43
Deferred Tax Liabilities, Gross	1,464	1,440
Deferred Income Tax Liabilities, Net		$ (36)
Deferred Tax Assets (Liabilities), Net	477
Operating Loss Carryforwards	25,000
Net Operating Loss Carry Forwards That Will Expire	15,100
Tax Credit Carryforward, Amount	$ 35

Income Taxes Valuation Allowanc

Income Taxes Valuation Allowance, Additional Details (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase, Amount	$ 26			$ 56
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount		$ 30	$ (76)		$ (70)	$ (284)	$ 31

Income Taxes Uncertain Tax Posi

Income Taxes Uncertain Tax Position, Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Tax Adjustments, Settlements, and Unusual Provisions			$ 586
Release of tax indemnification reserve	$ (226)		(226)
Unrecognized Tax Benefits, Decrease (Increase) Resulting from Tax Audit Resolution				$ 25
Unrecognized Tax Benefits		$ 2,528	2,451	2,358	$ 2,161
Amount of unrecognized tax benefits which may impact effective tax rate		2,132	2,121	2,225
Total net accrued interest, net of tax benefit		205	181	119
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 0	$ 0	$ 108

Income Taxes Other Tax Matters

Income Taxes Other Tax Matters (Details) - USD ($) $ in Millions	3 Months Ended					12 Months Ended				24 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2020
Other Tax Matters [Line Items]
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability				$ 139
Nondeductible expense related to restructuring and impairment						$ 50	$ (24)	$ (4)
Income tax provision (benefit)						108	(233)	197
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 30		$ (76)			(70)	(284)	31
Mark-to-market gain (loss)						(274)	(618)	24
Release of tax indemnification reserve		$ (226)					(226)
Restructuring and impairment costs						783	235	255
Impact of acquisitions and divestitures						0	0	16
Power Solutions
Other Tax Matters [Line Items]
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax		4,000
Scott Safety business [Member]
Other Tax Matters [Line Items]
Gain (loss) on divestiture					$ 114
Income tax expense from disposal					30
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax					$ 84
Global Products
Other Tax Matters [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 15	$ 235					235			$ 250
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount							(53)
2017 Restructuring Plan [Member]
Other Tax Matters [Line Items]
Restructuring and impairment costs									$ 367
2018 Restructuring Plan [Member]
Other Tax Matters [Line Items]
Restructuring and impairment costs								263
Transaction and integration costs [Member]
Other Tax Matters [Line Items]
Transaction and integration costs						135	317	226
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount						18	35	27
Pension mark-to-market [Member]
Other Tax Matters [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount						(65)	$ (130)	1
Restructuring Charges [Member]
Other Tax Matters [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount						$ 48		36
Continuing Operations [Member] | 2017 Restructuring Plan [Member]
Other Tax Matters [Line Items]
Restructuring and impairment costs									347
Continuing Operations [Member] | 2017 Restructuring Plan [Member] | Global Products
Other Tax Matters [Line Items]
Restructuring and impairment costs									$ 32
Continuing Operations [Member] | 2018 Restructuring Plan [Member]
Other Tax Matters [Line Items]
Restructuring and impairment costs								255
Continuing Operations [Member] | 2018 Restructuring Plan [Member] | Global Products
Other Tax Matters [Line Items]
Restructuring and impairment costs								$ 113

Income Taxes Changes in Tax Leg

Income Taxes Changes in Tax Legislation and Statutory Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 30	$ (76)		$ (70)	$ (284)	$ 31
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				0	0	108
Income tax provision				$ (108)	$ 233	$ (197)
US statutory tax rate					12.50%	12.50%
Remeasurement of U.S. deferred tax assets and liabilities [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Income tax provision			$ (101)			$ (108)
Transition Tax on Deemed Repatriated Earnings [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Income tax provision			$ (305)			$ (216)
United States
Change in Tax Legislation and Statutory Tax Rates [Line Items]
US statutory tax rate						21.00%
US Statutory Income Tax Rate, Blended						24.50%

Segment Information (Details)

Segment Information (Details)	12 Months Ended
	Sep. 30, 2020PersonSegment	Sep. 30, 2019Person	Sep. 30, 2018Person
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	4
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer	10.00%	10.00%	10.00%
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person	0	0	0

Segment Information Financial I

Segment Information Financial Information Related to Company's Reportable Segments (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2018
Segment Information [Line Items]
Net sales		$ 22,317	$ 23,968		$ 23,400
Segment EBITA		2,948	3,041		3,138
Amortization of Intangible Assets		(386)	(377)		(376)
General corporate expenses	[1]	(371)	(405)		(584)
Net financing charges		(231)	(350)		(401)
Restructuring and impairment costs		(783)	(235)		(255)
Mark-to-market gain (loss)		(274)	(618)		24
Income from continuing operations before income taxes		903	1,056		1,546
Total assets		40,815	42,287		48,797
Assets held for sale		147	158		8,203
Depreciation and amortization		822	825		824
Capital expenditures		443	586		645
Equity income in segment income		171	192		177
Building Solutions North America
Segment Information [Line Items]
Net sales		8,605	9,031
Equity Method Investments		7	8		8
Building Solutions EMEA/LA
Segment Information [Line Items]
Net sales		3,440	3,655
Equity Method Investments		108	109		99
Building Solutions Asia Pacific
Segment Information [Line Items]
Net sales		2,403	2,658
Equity Method Investments		2	6		1
Global Products
Segment Information [Line Items]
Net sales		7,869	8,624
Equity Method Investments		797	730		740
Building Technologies & Solutions
Segment Information [Line Items]
Total assets		36,806	36,950		37,385
Depreciation and amortization		773	764		764
Capital expenditures		419	548		520
Building Technologies & Solutions | Building Solutions North America
Segment Information [Line Items]
Net sales		8,605	9,031		8,679
Segment EBITA	[2]	1,157	1,153		1,109
Restructuring and impairment costs		(520)			(20)
Total assets	[3]	15,215	15,562		15,384
Depreciation and amortization		233	233		236
Capital expenditures		93	119		114
Equity income in segment income		(1)
Building Technologies & Solutions | Building Solutions EMEA/LA
Segment Information [Line Items]
Net sales		3,440	3,655		3,696
Segment EBITA	[4]	338	368		344
Restructuring and impairment costs		(59)			(56)
Total assets	[5]	4,989	4,786		4,997
Depreciation and amortization		102	112		110
Capital expenditures		99	93		73
Equity income in segment income		6	12		1
Building Technologies & Solutions | Building Solutions Asia Pacific
Segment Information [Line Items]
Net sales		2,403	2,658		2,553
Segment EBITA	[6]	319	341		347
Restructuring and impairment costs		(56)			(16)
Total assets	[7]	2,720	2,657		2,743
Depreciation and amortization		24	23		28
Capital expenditures		36	26		26
Equity income in segment income		1	1		1
Building Technologies & Solutions | Global Products
Segment Information [Line Items]
Net sales		7,869	8,624		8,472
Segment EBITA	[8]	1,134	1,179		1,338
Restructuring and impairment costs		(143)	(235)		(113)
Total assets		13,882	13,945	[9]	14,261	[9]
Depreciation and amortization		414	396		390
Capital expenditures		191	310		307
Equity income in segment income		166	179		175
Unallocated
Segment Information [Line Items]
Total assets		3,862	5,179		3,209
Corporate
Segment Information [Line Items]
Restructuring and impairment costs		(5)			(50)
Depreciation and amortization		49	61		60
Capital expenditures		24	38		125
Continuing Operations [Member]
Segment Information [Line Items]
Depreciation and amortization		822	825		824
Capital expenditures		443	586		645
Discontinued Operations
Segment Information [Line Items]
Depreciation and amortization		0	32		261
Capital expenditures		0	197		385
Continuing and Discontinued Operations [Member]
Segment Information [Line Items]
Depreciation and amortization		822	857		1,085
Capital expenditures		$ 443	$ 783		$ 1,030
[1]	Corporate expenses for the years ended September 30, 2020 and 2018 excludes $5 million and $50 million, respectively, of restructuring and impairment costs.
[2]	Building Solutions North America segment EBITA for the years ended September 30, 2020 and 2018 excludes $520 million and $20 million, respectively, of restructuring and impairment costs. For the year ended September 30, 2020, Building Solutions North America includes $1 million of equity losses.
[3]	Buildings Solutions North America assets as of September 30, 2020, 2019 and 2018 include $7 million, $8 million and $8 million, respectively, of investments in partially-owned affiliates.
[4]	Building Solutions EMEA/LA segment EBITA for the years ended September 30, 2020 and 2018 excludes $59 million, and $56 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions EMEA/LA segment EBITA includes $6 million, $12 million and $1 million, respectively, of equity income.
[5]	Building Solutions EMEA/LA assets as of September 30, 2020, 2019 and 2018 include $108 million, $109 million and $99 million, respectively, of investments in partially-owned affiliates.
[6]	Building Solutions Asia Pacific segment EBITA for the years ended September 30, 2020 and 2018 excludes $56 million and $16 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Building Solutions Asia Pacific segment EBITA includes less than $1 million, $1 million and $1 million, respectively, of equity income.
[7]	Building Solutions Asia Pacific assets as of September 30, 2020, 2019 and 2018 include $2 million and $6 million, and $1 million, respectively, of investments in partially-owned affiliates.
[8]	Global Products segment EBITA for the years ended September 30, 2020, 2019 and 2018 excludes $143 million, $235 million and $113 million, respectively, of restructuring and impairment costs. For the years ended September 30, 2020, 2019 and 2018, Global Products segment EBITA includes $166 million, $179 million and $175 million, respectively, of equity income.
[9]	Global Products assets as of September 30, 2020, 2019 and 2018 include $797 million, $730 million and $740 million, respectively, of investments in partially-owned affiliates.

Segment Information Financial_2

Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)PersonSegment	Sep. 30, 2019USD ($)Person	Sep. 30, 2018USD ($)Person
Segment Information [Line Items]
Number of reportable segments | Segment	4
Restructuring and impairment costs	$ 783	$ 235	$ 255
Equity income in segment income	171	192	177
Gain (loss) on business divestitures - net	$ 0	$ 0	$ 114
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person	0	0	0
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer	10.00%	10.00%	10.00%
Building Solutions North America
Segment Information [Line Items]
Equity Method Investments	$ 7	$ 8	$ 8
Building Solutions North America | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	520		20
Equity income in segment income	(1)
Global Products
Segment Information [Line Items]
Equity Method Investments	797	730	740
Global Products | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	143	235	113
Equity income in segment income	166	179	175
Building Solutions EMEA/LA
Segment Information [Line Items]
Equity Method Investments	108	109	99
Building Solutions EMEA/LA | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	59		56
Equity income in segment income	6	12	1
Building Solutions Asia Pacific
Segment Information [Line Items]
Equity Method Investments	2	6	1
Building Solutions Asia Pacific | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	56		16
Equity income in segment income	$ 1	$ 1	$ 1

Segment Information Geographic

Segment Information Geographic Segments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Geographic Area Information [Line Items]
Net sales	$ 22,317	$ 23,968	$ 23,400
Long-Lived Assets (Year-end)	3,059	3,348	3,300
United States
Geographic Area Information [Line Items]
Net sales	11,007	11,773	11,306
Long-Lived Assets (Year-end)	1,713	1,824	1,879
China
Geographic Area Information [Line Items]
Net sales	1,206	1,424	1,480
Long-Lived Assets (Year-end)	164	326	332
Germany
Geographic Area Information [Line Items]
Net sales	583	629	616
Long-Lived Assets (Year-end)	22	20	19
United Kingdom
Geographic Area Information [Line Items]
Net sales	980	1,042	1,075
Long-Lived Assets (Year-end)	70	77	73
Taiwan
Geographic Area Information [Line Items]
Net sales	725	612	661
Long-Lived Assets (Year-end)	133	141	154
Japan
Geographic Area Information [Line Items]
Net sales	1,789	1,943	1,903
Long-Lived Assets (Year-end)	204	228	209
Other European Countries
Geographic Area Information [Line Items]
Net sales	1,914	1,920	1,936
Long-Lived Assets (Year-end)	186	164	170
Other Foreign
Geographic Area Information [Line Items]
Net sales	4,113	4,625	4,423
Long-Lived Assets (Year-end)	$ 567	$ 568	$ 464

Nonconsolidated Partially-Own_3

Nonconsolidated Partially-Owned Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Assets, Current	$ 10,053	$ 12,393
Total assets	40,815	42,287	$ 48,797
Liabilities, Current	8,248	9,070
Liabilities, Noncurrent	14,034	12,388
Noncontrolling interests	1,086	1,063
Stockholders' Equity Attributable to Parent	17,447	19,766	21,164	$ 20,447
Liabilities and Equity	40,815	42,287
Gross Profit	7,411	7,693	7,667
Net income	$ 795	$ 5,887	2,383
Percentage of results of operations		100.00%
Equity Method Investment, Nonconsolidated Investees
Schedule of Equity Method Investments [Line Items]
Assets, Current		$ 2,941
Assets, Noncurrent		1,020
Total assets		3,961
Liabilities, Current		2,135
Liabilities, Noncurrent		157
Noncontrolling interests		67
Stockholders' Equity Attributable to Parent		1,602
Liabilities and Equity		3,961
Revenues		3,882	3,974
Gross Profit		1,070	1,049
Net income		411	390
Income attributable to noncontrolling interests		13	10
Net income attributable to the entity		$ 398	$ 380

Guarantees (Details)

Guarantees (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Guarantor Obligations [Line Items]
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities	1 year
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities	1 year
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 156	$ 197
Accruals for warranties issued during the period	71	78
Accruals from acquisitions and divestitures	0	1
Accruals related to pre-existing warranties (including changes in estimates)	9	(39)
Standard Product Warranty Accrual, Decrease for Payments	(71)	(79)
Currency translation	2	(2)
Balance at end of period	$ 167	$ 156

Commitments and Contingencies_2

Commitments and Contingencies (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Loss Contingencies [Line Items]
Reserves for environmental liabilities		$ 130	$ 159
Accrued Environmental Loss Contingencies, Current		61	52
Accrued Environmental Loss Contingencies, Noncurrent		69	107
Conditional asset retirement obligations		29	30
Estimated asbestos related net liability on a discounted basis		115	141
Liability for Asbestos and Environmental Claims, Gross		483	507
Restricted Cash and Investments		368	366
Insurance Recoveries		68	77
Insurable liabilities		363	379
Insurance Settlements Receivable		21	23
Insurance Settlements Receivable, Current		5	5
Insurance Settlements Receivable, Noncurrent		16	18
Asbestos Issue [Member]
Loss Contingencies [Line Items]
Restricted Cash and Cash Equivalents		9	16
Restricted Investments		291	273
Other current liabilities
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Gross		49	50
Insurable liabilities		83	99
Accrued Compensation and Benefits [Member]
Loss Contingencies [Line Items]
Insurable liabilities		22	22
Other Noncurrent Liabilities [Member]
Loss Contingencies [Line Items]
Liability for Asbestos and Environmental Claims, Gross		434	457
Insurable liabilities		258	258
Other current assets
Loss Contingencies [Line Items]
Restricted Cash and Investments		39	46
Other noncurrent assets
Loss Contingencies [Line Items]
Restricted Cash and Investments		$ 329	$ 320
Stanton Street Facility, Marinette, WI [Member]
Loss Contingencies [Line Items]
Environmental Remediation Expense	$ 140

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Related Party Transactions [Abstract]
Net sales to related parties	$ 194	$ 217	$ 220
Purchases from related parties	85	66	63
Receivable from related parties	48	34
Payable to related parties	11	6
Related Party Transaction [Line Items]
Net sales to related parties	194	217	220
Purchases from related parties	$ 85	$ 66	$ 63

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accounts Receivable - Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 173	$ 169	$ 172
Provision charged to costs and expenses	20	37	14
Accounts charged off, net of recoveries	(21)	(21)	(17)
Acquisition (divestiture) of businesses	0	(10)	0
Currency translation	1	(2)	0
Balance at end of period	173	173	169
Deferred Tax Assets - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	5,068	5,088	3,735
Allowance provision for new operating and other loss carryforwards	624	195	1,639
Allowance provision (benefits)	(174)	(215)	(286)
Balance at end of period	$ 5,518	$ 5,068	$ 5,088