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Acquisitions and Divestitures - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  | $ 24 | $ 6 |
Goodwill, Acquired During Period |  |  |  |  | 12 |  |
Proceeds from business divestitures, net of cash divested |  |  |  |  | 2,101 | 180 |
Reduction in goodwill related to business divestitures |  |  |  |  | 20 |  |
Cash paid related to prior acquistions |  |  |  |  | 0 | 75 |
Scott Safety business [Member] |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from business divestitures, net of cash divested |  |  | $ 2,000 |  |  |  |
Reduction in goodwill related to business divestitures |  |  | 1,200 |  |  |  |
Gain on sale of Scott Safety business |  |  | 114 |  |  |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  | 84 |  |  |  |
Business Divestitures, Not Specific [Member] |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from business divestitures, net of cash divested |  |  |  |  |  | 52 |
Proceeds from Divestiture of Businesses |  |  |  |  |  | $ 4 |
Number Of Businesses Divested |  |  |  |  |  | 1 |
Cash Divested from Deconsolidation |  |  |  |  |  | $ 5 |
Individually Immaterial Acquisitions |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  |  | $ 6 |
Number of acquisitions |  |  |  |  |  | 3 |
Purchase price, net of cash acquired |  |  |  |  |  | $ 9 |
Global Products | Business Divestitures, Not Specific [Member] |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from business divestitures, net of cash divested |  | $ 103 |  |  |  |  |
Reduction in goodwill related to business divestitures |  | 20 |  |  |  |  |
Global Products | Individually Immaterial Acquisitions |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash paid for business acquisition |  |  |  |  | 24 |  |
Goodwill, Acquired During Period |  |  |  |  | 12 |  |
Building Solutions EMEA/LA | ADT security business in South Africa [Member] |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from business divestitures, net of cash divested |  |  |  | $ 129 |  |  |
Reduction in goodwill related to business divestitures |  |  |  | $ 92 |  |  |
Power Solutions |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | 0 |  |
Reduction in goodwill related to business divestitures |  |  |  |  | $ 0 |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Repayments of Debt | $ 400 | $ 26 | $ 1,900 |  |  |  |
Long-term Debt |  |  |  |  |  |  | $ 4,000

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