Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Long-Lived Asset Impairments Fixed Asset Impairment [Member] jci_FixedAssetImpairmentMember [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] AFFF Property Damage AFFF Property Damage [Member] AFFF Property Damage Short-term Debt, Type [Axis] Short-Term Debt, Type [Axis] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus North Carolina NORTH CAROLINA Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Restructuring Plan [Axis] Restructuring Plan [Axis] Ordinary shares, $0.01 par value Common Stock, Value, Issued Interest expense, net of capitalized interest costs Interest Expense, Operating and Nonoperating Employee equity-based compensation withholding taxes Payment, Tax Withholding, Share-Based Payment Arrangement Accrued compensation and benefits Employee-related Liabilities, Current Trademarks/trade names Trademarks [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Pension and Retirement Plans Retirement Benefits [Text Block] Net financing charges Net financing charges Net financing charges Net Financing Charges Net financing charges includes interest expense, interest income, bank fees and amortization of debt issuance costs. Restatement Determination Date Restatement Determination Date Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Derivative Instrument [Axis] Derivative Instrument [Axis] Indefinite-lived intangible assets Intangible Asset, Excluding Goodwill, Indefinite-Lived [Abstract] Total net accrued interest, net of tax benefit Unrecognized Tax Benefits, Interest on Income Taxes Accrued Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Restructuring and impairment costs Restructuring costs and asset impairment charges Restructuring and related costs Restructuring Costs and Asset Impairment Charges Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disposal Group Classification [Axis] Disposal Group Classification [Axis] Loss Contingencies [Table] Loss Contingencies [Table] Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Noncurrent liabilities Liabilities, Noncurrent Ordinary A shares, €1.00 par value Common Stock A, Value, Issued Common Stock A, Value, Issued Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Ordinary shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition 4.900% Senior Notes due 2032 Notes 4.900 Percent Due 2032 [Member] Notes 4.900 Percent Due 2032 Other intangible assets - net Net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Basic weighted average shares outstanding (in shares) Weighted Average 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income Interest and Other Income EMEA EMEA Segment [Member] EMEA Segment Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Entity Address, City or Town Entity Address, City or Town Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Segment Reporting, Descriptive Information [Abstract] Segment Reporting, Descriptive Information [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Document Information [Line Items] Document Information [Line Items] Disposal group, assets Disposal Group, Including Discontinued Operation, Assets Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Net Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net financing charges Disposal Group, Including Discontinued Operation, Interest 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of Long-Term Debt Instruments [Table] Cash provided by operating activities from continuing operations Cash Provided by (Used in) Operating Activity, Continuing Operation Ordinary shares held in treasury, at cost Treasury Stock, Value Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] 5.125% Notes due 2045 Notes 5.125 Percent Due 2045 [Member] Notes 5.125 Percent Due 2045 Litigation Case [Axis] Litigation Case [Axis] Financial Information Related to Company's Reportable Segments Segment Reporting [Table Text Block] Shareholders' Equity Attributable to Noncontrolling Interests Noncontrolling Interest [Member] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] AFFF Municipal and Water Provider Cases Aqueous Film Forming Foam Municipal And Water Provider Cases [Member] Aqueous Film Forming Foam Municipal And Water Provider Cases Identified intangible assets, excluding 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Allowance, Deferred Tax Asset, Increase (Decrease), Amount Supplemental Cash Flow Disclosures Cash Flow, Supplemental Disclosures [Text Block] Discontinued operations Income from discontinued operations attributable to noncontrolling interest, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest Supply Chain Financing Supplier Finance Program [Text Block] Total liabilities Liabilities, Fair Value Disclosure Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Changes in estimates to pre-existing warranties Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Changes in Carrying Amount of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Discontinued Operations Cash Provided by (Used in) Discontinued Operation [Abstract] Weighted Average Shares Outstanding Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Basic earnings (loss) per share attributable to Johnson Controls Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Loss contingency, number of pending claims transferred to multi-district litigation Loss Contingency, Number Of Pending Claims Transferred To Multi-District Litigation Loss Contingency, Number Of Pending Claims Transferred To Multi-District Litigation Gross Carrying Amount Intangible Asset, Excluding Goodwill, Indefinite-Lived ADT United Kingdom Residential Security Business ADT United Kingdom Residential Security Business [Member] ADT United Kingdom Residential Security Business Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Equity income Disposal Group, Including Discontinued Operation, Equity Income Disposal Group, Including Discontinued Operation, Equity Income 6.000% Notes due 2036 Notes 6.000 Percent Due 2036 [Member] Notes 6.000 Percent Due 2036 Diluted earnings (loss) per share attributable to Johnson Controls Earnings Per Share, Diluted [Abstract] Discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Divestitures of businesses, net of cash divested Proceeds from Divestiture of Businesses, Net of Cash Divested Credit Facility [Domain] Credit Facility [Domain] Operating Activities of Continuing Operations Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Capitalized contract cost, amortization Capitalized Contract Cost, Amortization Individual: Individual [Axis] Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Pension and postretirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Disposal Group Name [Domain] Disposal Group Name Disposal Group Name [Domain] Current Restructuring Plans Various 2023 Restructuring Plans [Member] Various 2023 Restructuring Plans Underlying Security Market Price Change Underlying Security Market Price Change, Percent Commercial paper Commercial Paper [Member] Summary of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Short-term debt Short-Term Debt Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Miscellaneous Other Intangible Assets [Member] Guarantees Guarantees [Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Ordinary Shares Held in Treasury, at Cost Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Cash (used) provided by operating activities Cash Provided by (Used in) Operating Activity, Discontinued Operation Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition 5.250% Senior Notes due 2041 Notes 5.250 Percent Due 2041 [Member] Notes 5.250 Percent Due 2041 Quoted Prices in Active Markets (Level 1) Public debt Fair Value, Inputs, Level 1 [Member] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Foreign currency translation and other Goodwill, Foreign Currency Translation And Other Goodwill, Foreign Currency Translation And Other Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Indefinite-lived Intangible Assets, Major Class Name [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Gross profit Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Restructuring Reserve [Abstract] Restructuring Reserve [Abstract] Stock options, unvested restricted stock and unvested performance share awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements 4.500% Senior Notes due 2047 Notes 4.500 Percent Due 2047 [Member] Notes 4.500 Percent Due 2047 Income from continuing operations Total Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest All Executive Categories All Executive Categories [Member] Repurchases and retirements of ordinary shares Stock Repurchased and Retired During Period, Value Accruals for warranties issued Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Investments Restricted Investments Preferred shares, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Depreciation included in Cost of sales and SG&A Depreciation Contract term Contract With Customer, Term Contract With Customer, Term AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Capitalized Contract Cost Capitalized Contract Cost [Table Text Block] Current portion of long-term debt Long-Term Debt and Lease Obligation, Current Segment Information Segment Reporting [Text Block] Minimum Minimum [Member] ADT Spain Security Business ADT Spain Security Business [Member] ADT Spain Security Business Payment of cash dividends Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Exchange traded funds Investments, Fair Value Disclosure Hedging Relationship [Axis] Hedging Relationship [Axis] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Cash Restricted Cash and Cash Equivalent Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Net mark-to-market adjustments Mark-To-Market Gain (Loss) Mark-To-Market Gain (Loss) Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Loss contingency, proposed claims, number Loss Contingency, Proposed Claims, Number Loss Contingency, Proposed Claims, Number Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Net periodic benefit credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Measurements Derivative [Table] Definite-lived intangible, useful life Intangible Asset, Finite-Lived, Useful Life AFFF Putative Class Actions Aqueous Film Forming Foam Putative Class Actions [Member] Aqueous Film Forming Foam Putative Class Actions Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Deferred compensation plan assets Deferred Compensation Plan Assets Fair Value of Long-Term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs Restructuring Cost [Table] Investing Activities of Continuing Operations Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Insurance receivables for asbestos-related liabilities Estimated Insurance Recoveries Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Unrecognized tax benefits, income tax penalties and interest expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Debt and Financing Arrangements Debt Disclosure [Text Block] Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Contract assets - noncurrent Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Disposal Group Classification [Domain] Disposal Group Classification [Domain] Current Restructuring Plans Current Restructuring Plans [Member] Current Restructuring Plans Definite-lived intangible assets Intangible Asset, Finite-Lived, before Accumulated Amortization [Abstract] Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Balance at September 30, 2025 Balance at June 30, 2026 Restructuring Reserve Acquisition and Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Technology Patented Technology [Member] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Foreign currency exchange derivatives Foreign Exchange Contract [Member] Adoption Date Trading Arrangement Adoption Date Proceeds from divestiture of business Disposal Group, Including Discontinued Operation, Consideration Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Cash dividends declared Dividends, Common Stock, Cash Shareholders’ equity attributable to Johnson Controls Equity, Attributable to Parent Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Cash used by financing activities Cash Provided by (Used in) Financing Activity, Discontinued Operation 4.950% Senior Notes due 2064 Notes 4.950 Percent Due 2064 [Member] Notes 4.950 Percent Due 2064 Restructuring Type [Axis] Restructuring Type [Axis] Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Other - net Proceeds from (Payment for) Other Financing Activity Accounts receivable, allowance for credit loss, current Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Deferred income taxes Deferred Income Tax Expense (Benefit) Selling, general and administrative expenses Selling, general and administrative expenses ("SG&A") Selling, General and Administrative Expense Noncurrent liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Net foreign exchange results for financing activities Net Foreign Exchange Results For Financing Activities Net foreign exchange results for financing activities. Repayments of debt Debt repayments Repayments of Debt Type of Restructuring [Domain] Type of Restructuring [Domain] Business Combination [Domain] Business Combination [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Currency translation Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Other noncurrent assets Capitalized Contract Cost, Net, Noncurrent Changes in Carrying Amount of Goodwill Goodwill [Table Text Block] Goodwill Goodwill, Gross Entity Central Index Key Entity Central Index Key Americas Americas Segment [Member] Americas Segment Capital in excess of par value Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Business Combination [Axis] Business Combination [Axis] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Payments for legal settlements Payments for Legal Settlements Revenue, remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Disposal group, liabilities Disposal Group, Including Discontinued Operation, Liabilities Other Stockholders' Equity, Other Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Cash (used) provided by discontinued operations Cash Provided by (Used in) Discontinued Operation Restructuring Plan [Domain] Restructuring Plan [Domain] Derivatives and Hedging Activities  Designated as Hedging Instruments Designated as Hedging Instrument [Member] 5.70% Senior Notes due 2041 Notes 5.700 Percent Due 2041 [Member] Notes 5.700 Percent Due 2041 Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Income (loss) attributable to Johnson Controls Income (Loss) Attributable to Parent, before Tax [Abstract] Loss contingency, number of tribal corporations Loss Contingency, Pending Claims, Number Of Tribal Corporations Filing Lawsuit Loss Contingency, Pending Claims, Number Of Tribal Corporations Filing Lawsuit City Area Code City Area Code AFFF Individual or Mass Actions Aqueous Film Forming Foam Individual Or Mass Actions [Member] Aqueous Film Forming Foam Individual Or Mass Actions Income Tax Examination [Line Items] Income Tax Examination [Line Items] Accumulated Other Comprehensive Loss AOCI Attributable to Parent AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Fair value of long term debt Debt Instrument, Fair Value Disclosure Schedule of Loss Contingencies by Contingency Schedule of Loss Contingencies by Contingency [Table Text Block] Name Forgone Recovery, Individual Name Finished goods Inventory, Finished Goods, Net of Reserves 1.000% Senior Notes due 2032 Notes 1.000 Percent Due 2032 [Member] Notes 1.000 Percent Due 2032 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Cash used by investing activities from continuing operations Cash Provided by (Used in) Financing Activity, Continuing Operation Statement [Line Items] Statement [Line Items] Total assets Assets Assets Total reserves for environmental liabilities Accrual for Environmental Loss Contingencies Continuing operations Attributable to noncontrolling interests Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Residential and Light Commercial HVAC Business Residential and Light Commercial HVAC Business [Member] Residential and Light Commercial HVAC Business Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Operating Segments Operating Segments [Member] Reserve for environmental liabilities, current Accrued Environmental Loss Contingencies, Current Net sales Disposal Group, Including Discontinued Operation, Revenue Current period changes in fair value Other Comprehensive Income (Loss), before Reclassifications, before Tax Other assets Increase (Decrease) in Other Operating Assets PEO PEO [Member] Discontinued operation, final purchase price adjustments, payment Discontinued Operation, Final Purchase Price Adjustments, Payment Discontinued Operation, Final Purchase Price Adjustments, Payment Other noncurrent liabilities Other Liabilities, Noncurrent Goodwill Balance at beginning of period Balance at end of period Goodwill Fixed Income Securities Fixed Income Securities [Member] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Acquisitions Goodwill, Acquired During Period Provision for income taxes on discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation (Gain) loss on business divestitures Gain (Loss) On Disposition Of Business, Excluding Immaterial Gains Gain (Loss) On Disposition Of Business, Excluding Immaterial Gains Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized ADT Mexico Business ADT Mexico Business [Member] ADT Mexico Business Corporate expenses General Corporate Expenses General expenses recorded at the Corporate segment. Payables and Accruals [Abstract] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Retained Earnings Retained Earnings [Member] Revolving Credit Facility Revolving Credit Facility [Member] Total asbestos-related liabilities Liability for Asbestos and Environmental Claims, Gross APAC APAC Segment [Member] APAC Segment Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Total (in dollars per share) Earnings Per Share, Diluted Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Current Reporting Status Entity Current Reporting Status Total Shareholder Return Amount Total Shareholder Return Amount Employee equity-based compensation withholding taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation $2.5 Billion Facility Expiring Dec 2024 $2.5 billion facility expiring Dec 2024 [Member] $2.5 billion facility expiring Dec 2024 Litigation Case [Domain] Litigation Case [Domain] Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Net proceeds (payments) from borrowings with maturities less than three months Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Total self-insured liabilities Insurable Liabilities Insurable Liabilities Adjustments to reconcile net income to cash provided by operating activities of continuing operations: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Other financing charges Other financing charges The total amount of other financing charges charged to income in the period through the net financing charges line item in the statement of income. Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Other Restructuring Costs, Other Restructuring Costs, Other Financing Activities of Continuing Operations Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment - net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Net sales Total Revenue from Contract with Customer, Excluding Assessed Tax Restricted Restricted Cash and Investments [Abstract] Interest cost Defined Benefit Plan, Interest Cost Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Current assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Inventories Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Other Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Alloy Enterprises and Nantum AI Alloy Enterprises and Nantum AI [Member] Alloy Enterprises and Nantum AI Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Gross Carrying Amount Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue Recognition Revenue from Contract with Customer [Text Block] Negotiated commercial terms Supplier Finance Program, Payment Timing, Period FTC-Related Remediation and Litigation FTC-Related Remediation And Litigation [Member] FTC-Related Remediation And Litigation Other - net Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Guarantees [Abstract] Guarantees [Abstract] Other current assets Other Assets, Current Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Intangible Assets [Table] Intangible Assets [Table] Intangible Assets [Table] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Services Service [Member] Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date (Gain) loss on business divestitures Gain (Loss) on Disposition of Business Disposal group, impairment charges Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount State or U.S. Territory Attorneys General Litigation Related to AFFF State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam [Member] State Or U.S. Territory Attorneys General Litigation Related To Aqueous Film Forming Foam Fair Value [Line Items] Derivative [Line Items] Restructuring costs to be incurred Restructuring and Related Cost, Expected Cost Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Cash Dividends Declared per Ordinary Share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service cost Defined Benefit Plan, Service Cost Income Tax Examination Income Tax, Examination [Table] Equity Securities Equity Securities [Member] Dividends Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncash restructuring and impairment charges Asset, Impairment Loss Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Measure: Measure [Axis] Cost of goods sold Disposal Group, Including Discontinued Operation, Costs of Goods Sold Alaska ALASKA Reserve for environmental liabilities, noncurrent Accrued Environmental Loss Contingencies, Noncurrent 4.625% Senior Notes due 2044 Notes 4.625 Percent due 2044 [Member] Notes 4.625 Percent due 2044 Net asbestos-related liabilities Estimated Asbestos Related Net Liability On A Discounted Basis Estimated Asbestos Related Net Liability On A Discounted Basis Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Equity Components [Axis] Equity Components [Axis] Loss contingency, filed petition, number of jurisdictions to consolidate into Loss Contingency, Filed Petition, Number Of Jurisdictions To Consolidate Into Loss Contingency, Filed Petition, Number Of Jurisdictions To Consolidate Into Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Total Capitalized Contract Cost, Net Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Common Class A Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Supplier Finance Program [Line Items] Supplier Finance Program [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Amount of (loss) recognized in income on derivative Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Entity Small Business Entity Small Business Comprehensive income attributable to Johnson Controls Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Discontinued operations Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Fair Value Measurements, Recurring and Nonrecurring Fair Value, Recurring and Nonrecurring [Table] Aqueous Film Forming Foam ("AFFF") Litigation Aqueous Film Forming Foam Litigation [Member] Aqueous Film Forming Foam Litigation Ireland statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other noncurrent assets Other Assets, Noncurrent Document Type Document Type Acquisitions of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Restructuring reserves Increase (Decrease) in Restructuring Reserve Schedule of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from debt Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Contract liabilities - noncurrent Contract with Customer, Liability, Noncurrent Consolidation Items [Axis] Consolidation Items [Axis] Other current assets Capitalized Contract Cost, Net, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Net Investment Hedging Net Investment Hedging [Member] Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 18) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Restructuring and impairment costs Disposal Group, Including Discontinued Operation, Restructuring And Impairment Costs Disposal Group, Including Discontinued Operation, Restructuring And Impairment Costs Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Cash used by investing activities Cash Provided by (Used in) Investing Activity, Discontinued Operation Equity income Equity income Income (Loss) from Equity Method Investments Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Net tax impact Other Comprehensive Income (Loss), Tax Water Provider AFFF Settlement Agreement Water Provider AFFF Settlement Agreement [Member] Water Provider AFFF Settlement Agreement Goodwill [Roll Forward] Goodwill [Roll Forward] Liabilities and Equity Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] New Multi-Year Restructuring Plan New Multi-Year Restructuring Plan [Member] New Multi-Year Restructuring Plan Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Environmental loss contingencies payment period Environmental Loss Contingencies, Payment Period Environmental Loss Contingencies, Payment Period Balance at September 30, 2025 Balance at June 30, 2026 Standard and Extended Product Warranty Accrual Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Notes 3.90 Percent Due 2026 Notes 3.90 Percent Due 2026 [Member] Notes 3.90 Percent Due 2026 6.950% Debentures due December 1, 2045 Debentures 6.950 Percent Due December 1, 2045 [Member] Debentures 6.950 Percent Due December 1, 2045 PEO Name PEO Name Geographical [Axis] Geographical [Axis] Income from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Less: Restricted cash Restricted Cash Other Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Schedule of Short-Term Debt [Table] Short-Term Debt [Table] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Utilized—cash Payments for Restructuring Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation IRELAND IRELAND Settlements made Standard and Extended Product Warranty Accrual, Decrease for Payments Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Total comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 3.000% Senior Notes due 2028 Notes 3.000 Percent Due 2028 [Member] Notes 3.000 Percent Due 2028 Debt Instrument [Axis] Debt Instrument [Axis] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Disposal Group Name [Axis] Disposal Group Name [Axis] Inventories Schedule of Inventory, Current [Table Text Block] State Of Wisconsin v. Tyco Fire Products, LP And Johnson Controls, Inc. State Of Wisconsin v. Tyco Fire Products, LP And Johnson Controls, Inc. [Member] State Of Wisconsin v. Tyco Fire Products, LP And Johnson Controls, Inc. Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Total (in dollars per share) Earnings Per Share, Basic Stock repurchases and retirements Payments for Repurchase of Common Stock Deferred revenue Contract liabilities - current Contract with Customer, Liability, Current Current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Supplier Finance Program [Table] Supplier Finance Program [Table] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, less allowance for expected credit losses of $165 and $205, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Schedule of Short-Term Debt and Net Financing Charges Schedule of Short-Term Debt [Table Text Block] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Product and Service [Axis] Product and Service [Axis] Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Foreign currency denominated debt Foreign Currency Denominated Debt [Member] Foreign Currency Denominated Debt [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Short-Term Debt [Line Items] Short-Term Debt [Line Items] Ordinary Shares Common Stock [Member] Intangible Assets [Line Items] Intangible Assets [Line Items] Intangible Assets [Line Items] Gain on divestiture Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Contingent earn-out liabilities Business Combination, Contingent Consideration, Liability Accounts payable included in SCF programs Supplier Finance Program, Obligation, Current Segment, Number Of Profitability Measures Segment, Number Of Profitability Measures Segment, Number Of Profitability Measures Employee Severance and Termination Benefits Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Weighted average interest rate on short-term debt outstanding Short-Term Debt, Weighted Average Interest Rate, at Point in Time Derivative Contract [Domain] Derivative Contract [Domain] Term loans Loans Payable [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Noncurrent assets held for sale Disposal Group, Including Discontinued Operation, Assets, Noncurrent Hedging Relationship [Domain] Hedging Relationship [Domain] Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Reclassification to income Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Noncontrolling interests Equity, Attributable to Noncontrolling Interest Discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Restructuring and impairment costs Restructuring Charges Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] 1.750% Senior Notes due 2030 Notes 1.750 Percent Due 2030 [Member] Notes 1.750 Percent Due 2030 Tabular List, Table Tabular List [Table Text Block] Bank borrowings Notes Payable to Banks [Member] Number of pending claims where affiliates are seeking damages Loss Contingency, Affiliate Seeking Damages, Pending Claims, Number Loss Contingency, Affiliate Seeking Damages, Pending Claims, Number Shareholders' Equity Attributable to Johnson Controls Parent [Member] Name Awards Close in Time to MNPI Disclosures, Individual Name Entity Address, Country Entity Address, Country Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] Preferred shares, $0.01 par value Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] 0.375% Senior Notes due 2027 Notes 0.375 Percent Due 2027 [Member] Notes 0.375 Percent Due 2027 Loss contingency, pending claims, number Loss Contingency, Pending Claims, Number 5.500% Senior Notes due 2029 Notes 5.500 Percent Due 2029 [Member] Notes 5.500 Percent Due 2029 Hedging Designation [Domain] Hedging Designation [Domain] Loss contingency, pending claims, number of states originated from Loss Contingency, Pending Claims, Number Of States Originated From Loss Contingency, Pending Claims, Number Of States Originated From Class of Stock [Domain] Class of Stock [Domain] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Capital expenditures Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] 4.250% Senior Notes due 2035 Notes 4.250 Percent Due 2035 [Member] Notes 4.250 Percent Due 2035 Credit Facility [Axis] Credit Facility [Axis] Restructuring and Related Costs Restructuring and Related Activities Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total assets Assets, Fair Value Disclosure Long-term debt Long-Term Debt and Lease Obligation Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Utilized—noncash Restructuring Reserve, Settled without Cash Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other - net Other Noncash Income (Expense) Debt Instrument [Line Items] Debt Instrument [Line Items] Tax Jurisdictions and Years Currently under Audit Exam Summary of Income Tax Examinations [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total consideration, net of cash acquired Business Combination, Consideration Transferred Capital in Excess of Par Value Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements [Abstract] Indefinite-lived Intangible Assets [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents at end of period Cash and Cash Equivalent Raw materials and supplies Inventory, Raw Materials, Net of Reserves Company Selected Measure Amount Company Selected Measure Amount Segment EBIT Earnings Before Interest And Taxes Earnings Before Interest And Taxes Equity securities, unrealized gains Equity Securities, FV-NI, Unrealized Gain (Loss) Depreciation and amortization Depreciation, Depletion and Amortization Other Intangible Assets Schedule Of Intangible Assets Table [Table Text Block] Tabular disclosure of amortizable and unamortizable intangible assets other than goodwill, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. Net income Net income Net income attributable to Johnson Controls Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Amount of unrecognized tax benefits which may impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Water systems AFFF insurance recoveries Insurance receivables for asbestos-related liabilities Insurance Recoveries Non-PEO NEO Non-PEO NEO [Member] Senior Notes Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax provision Income Tax Expense (Benefit) Segment EBITA (non-GAAP) Earnings Before Interest, Tax, And Amortization Earnings Before Interest, Tax, And Amortization Products and systems Products and Systems [Member] Products and Systems [Member] Change in cash, cash equivalents and restricted cash held for sale Change In Cash, Cash Equivalents And Restricted Cash Held For Sale Change in cash, cash equivalents, and restricted cash that are held for sale apart from normal operations and anticipated to be sold within one year. Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Total asbestos-related assets Restricted Cash and Investments Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Principles of Consolidation Consolidation, Policy [Policy Text Block] Increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Pension and postretirement benefits Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash New Accounting Standards Accounting Standards Update and Change in Accounting Principle [Text Block] Net income attributable to Johnson Controls Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Income (loss) from discontinued operations, net of tax Loss from discontinued operations, net of tax Income from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Loss contingency, number of subsidiaries in civil enforcement action Loss Contingency, Number Of Subsidiaries In Civil Enforcement Action Loss Contingency, Number Of Subsidiaries In Civil Enforcement Action Changes in Accumulated Other Comprehensive Income, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Contribution to resolve settlement Litigation Settlement, Amount Awarded to Other Party Goodwill transfer, out of Goodwill, Transfers Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Continuing operations Net income attributable to Johnson Controls Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income (loss) Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax 3.125% Senior Notes due 2033 Notes 3.125 Percent Due 2033 [Member] Notes 3.125 Percent Due 2033 Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]