Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Restructuring reserves Increase (Decrease) in Restructuring Reserve 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 Other current assets Other Current Assets [Member] Schedule of Short-Term Debt and Net Financing Charges Schedule of Short-Term Debt [Table Text Block] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Cash used by discontinued operations Cash Provided by (Used in) Discontinued Operation Award Timing Predetermined Award Timing Predetermined [Flag] Balance at September 30, 2025 Balance at March 31, 2026 Standard and Extended Product Warranty Accrual Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Gross Carrying Amount Intangible Assets, Gross (Excluding Goodwill) Indefinite-lived Intangible Assets [Axis] Indefinite-Lived Intangible Assets [Axis] Entity File Number Entity File Number Capital in Excess of Par Value Additional Paid-in Capital [Member] Other noncurrent assets Other Noncurrent Assets [Member] Equity income Equity income Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Net tax impact Other Comprehensive Income (Loss), Tax Bank borrowings Notes Payable to Banks [Member] Recently Adopted and Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy 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. Divestitures of businesses, net of cash divested Proceeds from Divestiture of Businesses, Net of Cash Divested Contract assets - current Contract with Customer, Asset, after Allowance for Credit Loss, Current Summary of Results Which were Reported as Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Schedule of Loss Contingencies by Contingency Schedule of Loss Contingencies by Contingency [Table Text Block] Goodwill [Line Items] Goodwill [Line Items] Employee equity-based compensation withholding taxes Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Total (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] 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 Net financing charges Net Financing Charges [Member] Net financing charges. Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial paper Commercial Paper [Member] Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Cash provided (used) by investing activities from continuing operations Cash Provided by (Used in) Financing Activity, Continuing Operation 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 Revenue Recognition Revenue from Contract with Customer [Text Block] Definite-lived intangible assets Finite-Lived Intangible Assets, Gross [Abstract] Utilized—noncash Restructuring Reserve, Settled without Cash Other comprehensive income (loss) Other comprehensive income (loss) Aggregate adjustment for the period Other Comprehensive Income (Loss), Net of Tax Financial Information Related to Company's Reportable Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Short-term debt Short-Term Debt Insurance receivables for asbestos-related liabilities Estimated Insurance Recoveries Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Disposal group, assets Disposal Group, Including Discontinued Operation, Assets Adjustment to Compensation, Amount Adjustment to Compensation Amount Revenue, remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Net proceeds from borrowings with maturities less than three months Proceeds from (Repayments of) Short-Term Debt, Maturing in Three Months or Less Asbestos Issue Asbestos Issue [Member] Other assets Increase (Decrease) in Other Operating Assets Principles of Consolidation Consolidation, Policy [Policy Text Block] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Disposal group, impairment charges Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Ordinary A shares, €1.00 par value Common Stock A, Value, Issued Common Stock A, Value, Issued Cash dividends declared Dividends, Common Stock, Cash Noncash restructuring and impairment charges Asset Impairment Charges Shareholders’ equity attributable to Johnson Controls Equity, Attributable to Parent Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Hedging Designation [Domain] Hedging Designation [Domain] 4.900% Senior Notes due 2032 Notes 4.900 Percent Due 2032 [Member] Notes 4.900 Percent Due 2032 Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Total asbestos-related liabilities Liability for Asbestos and Environmental Claims, Gross Total liabilities and equity Liabilities and Equity Discontinued Operations Cash Provided by (Used in) Discontinued Operation [Abstract] Liabilities and Equity Liabilities and Equity [Abstract] Antidilutive Securities Antidilutive Securities [Abstract] Antidilutive securities. 2.000% Sustainability-Linked Senior Notes due 2031 Sustainability Notes 2.000 Percent Due 2031 [Member] Sustainability Notes 2.000 Percent Due 2031 Cover [Abstract] Cover [Abstract] Divestitures Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Maximum Maximum [Member] Capital expenditures Segment, Expenditure, Addition to Long-Lived Assets EMEA EMEA Segment [Member] EMEA Segment Guarantees [Abstract] Guarantees [Abstract] Total net accrued interest, net of tax benefit Unrecognized Tax Benefits, Interest on Income Taxes Accrued Net Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Ordinary Shares Held in Treasury, at Cost Treasury Stock, Common [Member] Income from continuing operations Total Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Noncurrent liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Income from continuing operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Net financing charges Disposal Group, Including Discontinued Operation, Interest (Income) Expense Disposal Group, Including Discontinued Operation, Interest (Income) Expense Ordinary Shares, Par Value $0.01 Ordinary Shares, Par Value 0.01 [Member] Ordinary Shares, Par Value 0.01 Fair Value of Long-Term Debt Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Other noncurrent liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments Schedule of Long-Term Debt Instruments [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Gross profit Disposal Group, Including Discontinued Operation, Gross Profit (Loss) Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Comprehensive income attributable to Johnson Controls Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name Disposal Group Name [Domain] Name Measure Name Balance at September 30, 2025 Balance at March 31, 2026 Restructuring Reserve Continuing operations Net income attributable to Johnson Controls Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 5.125% Notes due 2045 Notes 5.125 Percent Due 2045 [Member] Notes 5.125 Percent Due 2045 Document Fiscal Period Focus Document Fiscal Period Focus 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 Discontinued operations Discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Settlements made Standard and Extended Product Warranty Accrual, Decrease for Payments Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest [Abstract] Award Type Award Type [Axis] Contract liabilities - noncurrent Contract with Customer, Liability, Noncurrent Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Hedging Relationship [Domain] Hedging Relationship [Domain] Long-term debt Long-Term Debt Total assets Assets Assets Trading Symbol Trading Symbol Accruals for warranties issued Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Geographical [Domain] Geographical [Domain] Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Operating Activities of Continuing Operations Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Technology Patented Technology [Member] Inventories Inventory Disclosure [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Cash Dividends Declared per Ordinary Share (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Total Capitalized Contract Cost, Net Right-of-use assets obtained in exchange for operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 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] Significant Other Observable Inputs (Level 2) Other long-term debt Fair Value, Inputs, Level 2 [Member] Cash Restricted Cash and Cash Equivalent Income Tax Examination [Line Items] Income Tax Examination [Line Items] Loss contingency, number of pending claims transferred to MDL Loss Contingency, Number Of Pending Claims Transferred To Multi-District Litigation Loss Contingency, Number Of Pending Claims Transferred To Multi-District Litigation Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Gross Carrying Amount Indefinite-Lived Intangible Assets (Excluding Goodwill) Gain on divestiture Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Document Information [Table] Document Information [Table] PEO PEO [Member] 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 Loss contingency, pending claims, number Loss Contingency, Pending Claims, Number Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Employee Severance and Termination Benefits Employee Severance [Member] Valuation allowance adjustment Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 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] Changes in Carrying Amount of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Retained Earnings Retained Earnings [Member] Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date 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 Income Statement [Abstract] Income Statement [Abstract] Income tax provision Income Tax Expense (Benefit) Current Restructuring Plans Various 2023 Restructuring Plans [Member] Various 2023 Restructuring Plans Investments in marketable common stock Investments, Fair Value Disclosure Document Information [Line Items] Document Information [Line Items] Other intangible assets - net Net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Derivatives and Hedging Activities  Designated as Hedging Instruments Designated as Hedging Instrument [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Capitalized Contract Cost Capitalized Contract Cost [Table Text Block] Other Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Shareholders' Equity Attributable to Johnson Controls Parent [Member] Net income Net income Net income attributable to Johnson Controls Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities Liabilities, Fair Value Disclosure Derivative, notional amount Derivative, Notional Amount Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Restructuring and Related Costs Restructuring and Related Activities Disclosure [Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] City Area Code City Area Code 5.250% Senior Notes due 2041 Notes 5.250 Percent Due 2041 [Member] Notes 5.250 Percent Due 2041 Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Cash used by investing activities Cash Provided by (Used in) Investing Activity, Discontinued Operation Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Investing Activities of Continuing Operations Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] 4.500% Senior Notes due 2047 Notes 4.500 Percent Due 2047 [Member] Notes 4.500 Percent Due 2047 Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Preferred shares, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Component Of EMEA Security Business Component Of EMEA Security Business [Member] Component Of EMEA Security Business Goodwill Balance at beginning of period Balance at end of period Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation included in Cost of sales and SG&A Depreciation Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Contract term Contract With Customer, Term Contract With Customer, Term Derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity Components [Axis] Equity Components [Axis] Currency translation Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Cash used by financing activities Cash Provided by (Used in) Financing Activity, Discontinued Operation Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Interest income Interest and Other Income Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Negotiated commercial terms Supplier Finance Program, Payment Timing, Period Accumulated impairment loss Goodwill, Impaired, Accumulated Impairment Loss Entity Address, Country Entity Address, Country Other Performance Measure, Amount Other Performance Measure, Amount Net mark-to-market adjustments Mark-To-Market Gain (Loss) Mark-To-Market Gain (Loss) Noncurrent assets held for sale Disposal Group, Including Discontinued Operation, Assets, Noncurrent Loss contingency, proposed claims, number Loss Contingency, Proposed Claims, Number Loss Contingency, Proposed Claims, Number Supplier Finance Program [Line Items] Supplier Finance Program [Line Items] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Current liabilities Liabilities, Current Other current liabilities Other Current Liabilities [Member] Restructuring and related cost, cost incurred to date Restructuring and Related Cost, Cost Incurred to Date Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] AFFF Putative Class Actions Aqueous Film Forming Foam Putative Class Actions [Member] Aqueous Film Forming Foam Putative Class Actions Less: Restricted cash Restricted Cash Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Payment of cash dividends Payments of Ordinary Dividends, Common Stock Other current assets Other Assets, Current Capital in excess of par value Additional Paid in Capital, Common Stock Other Other Restructuring [Member] Revenue, remaining performance obligation, expected timing of satisfaction, period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 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] (Gain) loss on business divestiture Gain (Loss) on Disposition of Business Document Fiscal Year Focus Document Fiscal Year Focus Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Deferred compensation plan assets Deferred Compensation Plan Assets Entity Interactive Data Current Entity Interactive Data Current Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Current Restructuring Plans Current Restructuring Plans [Member] Current Restructuring Plans Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Goodwill [Table] Goodwill [Table] 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] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Current portion of long-term debt Long-Term Debt and Lease Obligation, Current Trademarks/trade names Trademarks [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Income (loss) attributable to Johnson Controls Income (Loss) Attributable to Parent, before Tax [Abstract] 4.950% Senior Notes due 2064 Notes 4.950 Percent Due 2064 [Member] Notes 4.950 Percent Due 2064 Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Pension and postretirement benefits Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Contingent earn-out liabilities Business Combination, Contingent Consideration, Liability Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Fair Value Measurements, Recurring and Nonrecurring Fair Value, Recurring and Nonrecurring [Table] Cost of goods sold Disposal Group, Including Discontinued Operation, Costs of Goods Sold Amortization of intangible assets Amortization of Intangible Assets Selling, general and administrative expenses Selling, general and administrative expenses ("SG&A") Selling, General and Administrative Expense Changes in Accumulated Other Comprehensive Income, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Capital expenditures Payments to Acquire Productive Assets Depreciation and amortization Depreciation, Depletion and Amortization Other noncurrent assets Other Assets, Noncurrent Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Conditional asset retirement obligations Asset Retirement Obligation Amount of (loss) recognized in income on derivative Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 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] Supplemental Cash Flow Elements [Abstract] Net foreign exchange results for financing activities Net Foreign Exchange Results For Financing Activities Net foreign exchange results for financing activities. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Deferred revenue Contract liabilities - current Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Work-in-process Inventory, Work in Process, Net of Reserves Americas Americas Segment [Member] Americas Segment Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Ireland statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Contract assets - noncurrent Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Other - net Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Proceeds from divestiture of businesses Disposal Group, Including Discontinued Operation, Consideration Restructuring costs to be incurred Restructuring and Related Cost, Expected Cost Assets Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] 5.70% Senior Notes due 2041 Notes 5.700 Percent Due 2041 [Member] Notes 5.700 Percent Due 2041 Underlying Security Market Price Change Underlying Security Market Price Change, Percent Balance Sheet Location [Axis] Statement of Financial Position Location, Balance [Axis] Debt Instrument [Axis] Debt Instrument [Axis] Pension and Postretirement Plans Retirement Benefits [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] 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 Reclassification to income Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Credit Facility [Domain] Credit Facility [Domain] Gross Carrying Amount Finite-Lived Intangible Assets, Gross 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] Restructuring Reserve [Abstract] Restructuring Reserve [Abstract] Entity Address, Address Line One Entity Address, Address Line One AFFF Individual or Mass Actions Aqueous Film Forming Foam Individual Or Mass Actions [Member] Aqueous Film Forming Foam Individual Or Mass Actions Accumulated Other Comprehensive Loss AOCI Attributable to Parent AOCI Attributable to Parent [Member] Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Accounts receivable, allowance for credit loss, current Accounts Receivable, Allowance for Credit Loss, Current 1.000% Senior Notes due 2032 Notes 1.000 Percent Due 2032 [Member] Notes 1.000 Percent Due 2032 Amortization of prior service credit Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Water systems AFFF insurance recoveries Insurance receivables for asbestos-related liabilities Insurance Recoveries Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net periodic benefit credit Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Disposal Group, Held-for-sale, Not Discontinued Operations Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Disposal group, liabilities Disposal Group, Including Discontinued Operation, Liabilities Residential and Light Commercial HVAC Business Residential and Light Commercial HVAC Business [Member] Residential and Light Commercial HVAC Business Stock options, unvested restricted stock and unvested performance share awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Document Quarterly Report Document Quarterly Report Total assets Assets, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Discontinued operation, final purchase price adjustments, payment Discontinued Operation, Final Purchase Price Adjustments, Payment Discontinued Operation, Final Purchase Price Adjustments, Payment Number of operating segments Number of Operating Segments Guarantees Guarantees [Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Income Tax Examination Income Tax, Examination [Table] Interest cost Defined Benefit Plan, Interest Cost Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Cash provided by operating activities from continuing operations Cash Provided by (Used in) Operating Activity, Continuing Operation Services Service [Member] Other noncurrent liabilities Other Noncurrent Liabilities [Member] (Gain) loss on business divestiture Gain (Loss) On Disposition Of Business, Excluding Immaterial Gains Gain (Loss) On Disposition Of Business, Excluding Immaterial Gains Restatement Determination Date: Restatement Determination Date [Axis] ADT Mexico Business ADT Mexico Business [Member] ADT Mexico Business Supplier Finance Program [Table] Supplier Finance Program [Table] Corporate expenses General Corporate Expenses General expenses recorded at the Corporate segment. Non-PEO NEO Non-PEO NEO [Member] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] APAC APAC Segment [Member] APAC Segment Cash provided (used) by investing activities from continuing operations Cash Provided by (Used in) Investing Activity, Continuing Operation Other - net Proceeds from (Payment for) Other Financing Activity Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Investments Restricted Investments Miscellaneous Other Intangible Assets [Member] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Schedule of Short-Term Debt [Table] Short-Term Debt [Table] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] $2.5 Billion Facility Expiring Dec 2024 $2.5 billion facility expiring Dec 2024 [Member] $2.5 billion facility expiring Dec 2024 Other - net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Compensation Amount Outstanding Recovery Compensation Amount Total self-insured liabilities Insurable Liabilities Insurable Liabilities Alaska ALASKA Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Foreign currency exchange derivatives Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract with customer, liability, revenue recognized Contract with Customer, Liability, Revenue Recognized 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. Other Restructuring Costs, Other Restructuring Costs, Other Provision for income taxes on discontinued operations Discontinued Operation, Tax Effect of Discontinued Operation MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Utilized—cash Payments for Restructuring Restructuring Type [Axis] Restructuring Type [Axis] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Total asbestos-related assets Restricted Cash and Investments Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Ordinary shares held in treasury, at cost Treasury Stock, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Long-term debt Long-Term Debt and Lease Obligation Goodwill Goodwill, Gross Financial Instruments [Domain] Financial Instruments [Domain] Litigation Case [Axis] Litigation Case [Axis] FTC-Related Remediation and Litigation FTC-Related Remediation And Litigation [Member] FTC-Related Remediation And Litigation Segments [Domain] Segments [Domain] Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Balance Sheet Location [Domain] Statement of Financial Position Location, Balance [Domain] Inventories Increase (Decrease) in Inventories Inventories Inventories Inventory, Net Reserve for environmental liabilities, current Accrued Environmental Loss Contingencies, Current Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Intangible Assets [Table] Intangible Assets [Table] Intangible Assets [Table] Company Selected Measure Name Company Selected Measure Name Total reserves for environmental liabilities Accrual for Environmental Loss Contingencies Senior Notes Senior Notes [Member] Debt and Financing Arrangements Debt Disclosure [Text Block] Preferred shares, $0.01 par value Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current 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 Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Finished goods Inventory, Finished Goods, Net of Reserves Ordinary shares, $0.01 par value Common Stock, Value, Issued Restructuring Plan [Domain] Restructuring Plan [Domain] Goodwill [Roll Forward] Goodwill [Roll Forward] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Net sales Disposal Group, Including Discontinued Operation, Revenue Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average interest rate on short-term debt outstanding Short-Term Debt, Weighted Average Interest Rate, at Point in Time Commitments and contingencies (Note 18) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Fair Value Measurements Derivative [Table] Total comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Restricted Restricted Cash and Investments [Abstract] Term loans Loans Payable [Member] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Unrecognized tax benefits, income tax penalties and interest expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Shareholders' Equity Attributable to Noncontrolling Interests Noncontrolling Interest [Member] 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 Supplier Finance Program Supplier Finance Program [Text Block] Document Transition Report Document Transition Report Loss contingency, filed petition, number of jurisdictions to consolidate into Loss Contingency, Filed Petition, Number Of Jurisdictions To Consolidate Into Loss Contingency, Filed 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[Axis] Fair value of long term debt Debt Instrument, Fair Value Disclosure Aqueous Film Forming Foam ("AFFF") Litigation Aqueous Film Forming Foam Litigation [Member] Aqueous Film Forming Foam Litigation Total equity Beginning Balance Ending Balance Equity, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Weighted Average Shares Outstanding Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Loss Contingencies [Table] Loss Contingencies [Table] Product and Service [Axis] Product and Service [Axis] Net Investment Hedging Net Investment Hedging [Member] Derivative Contract [Domain] Derivative Contract [Domain] Net sales Total Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Selling, general and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Name Forgone Recovery, Individual Name Current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] 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] Cash provided (used) by operating activities Cash Provided by (Used in) Operating Activity, Discontinued Operation Disposal Group Classification [Axis] Disposal Group Classification [Axis] Accrued compensation and benefits Accrued Compensation and Benefits [Member] Accrued Compensation and Benefits [Member] Restructuring and impairment costs Disposal Group, Including Discontinued Operation, Restructuring And Impairment Costs Disposal Group, Including Discontinued Operation, Restructuring And Impairment 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Current Reporting Status Entity Current Reporting Status Fair Value [Line Items] Derivative [Line Items] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Retained earnings Retained Earnings (Accumulated Deficit) Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] 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] Executive Category: Executive Category [Axis] Repayments of debt Debt repayments Repayments of Debt 1.750% Senior Notes due 2030 Notes 1.750 Percent Due 2030 [Member] Notes 1.750 Percent Due 2030 Interest expense, net of capitalized interest costs Interest Expense, Operating and Nonoperating Proceeds from debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] IRELAND IRELAND Other Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Subsequent Event Type [Domain] Subsequent Event Type [Domain] 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 Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] 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] Current liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Payables and Accruals [Abstract] Allocation of goodwill from EMEA to held for sale assets Goodwill, Transfers Statement [Table] Statement [Table] 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 Deferred income taxes Deferred Income Tax Expense (Benefit) 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] Financing Activities of Continuing Operations Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Continuing operations Attributable to noncontrolling interests Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] 0.375% Senior Notes due 2027 Notes 0.375 Percent Due 2027 [Member] Notes 0.375 Percent Due 2027 Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Gross tax effected unrecognized tax benefits Unrecognized Tax Benefits 5.500% Senior Notes due 2029 Notes 5.500 Percent Due 2029 [Member] Notes 5.500 Percent Due 2029 Stock options and unvested restricted stock (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted Average Shares Outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] 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 All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag 4.250% Senior Notes due 2035 Notes 4.250 Percent Due 2035 [Member] Notes 4.250 Percent Due 2035 Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Raw materials and supplies Inventory, Raw Materials, Net of Reserves Foreign currency translation and other Goodwill, Foreign Currency Translation and Measurement Period Adjustments Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] Supplemental Cash Flow Disclosures Cash Flow, Supplemental Disclosures [Text Block] Cost of sales Cost of Product and Service Sold Amount of unrecognized tax benefits which may impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Disposal Group Classification [Domain] Disposal Group Classification [Domain] Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] North Carolina NORTH CAROLINA Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Other noncurrent assets Capitalized Contract Cost, Net, Noncurrent Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Segment EBIT Earnings Before Interest And Taxes Earnings Before Interest And Taxes Ordinary shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share 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. Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Contribution to resolve settlement Litigation Settlement, Amount Awarded to Other Party Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Accrued income taxes Increase (Decrease) in Income Taxes Payable Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] 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. Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Restructuring and impairment costs Restructuring costs and asset impairment charges Restructuring and related costs Restructuring Costs and Asset Impairment Charges Insider Trading Arrangements [Line Items] Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Equity Securities Equity Securities [Member] Noncurrent liabilities Liabilities, Noncurrent Liabilities Liabilities Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Accounts payable included in SCF programs Supplier Finance Program, Obligation, Current Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-Lived Intangible Assets, Major Class Name [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current 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 Pension and postretirement benefit obligations Liability, Defined Benefit Plan, Noncurrent Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents at end of period Cash and Cash Equivalent Ordinary Shares Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 3.125% Senior Notes due 2033 Notes 3.125 Percent Due 2033 [Member] Notes 3.125 Percent Due 2033 Non-NEOs Non-NEOs [Member] Increase 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