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Acquisitions and Divestitures - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2016
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Cash paid for business acquisition |  |  |  | $ 16 | $ 24 |
Goodwill, Acquired During Period |  |  |  | 10 |  |
Proceeds from business divestitures, net of cash divested |  |  |  | 12 | 2,101 |
Reduction in goodwill related to business divestitures |  |  |  | 23 |  |
Purchase price, net of cash acquired |  |  |  | 16 |  |
Power Solutions |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 13,200 |  |  | 13,200 |  |
Disposal Group, Discontinued Operations, Consideration, net | 11,600 |  |  | 11,600 |  |
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax | 5,200 |  |  | 5,200 |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax | 4,000 |  |  |  |  |
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 Divestiture of Businesses | $ 18 |  |  | 18 |  |
Proceeds from business divestitures, net of cash divested |  |  |  | 12 |  |
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 |  |  |  | 9 | $ 12 |
Building Solutions EMEA/LA | Business Divestitures, Not Specific [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Reduction in goodwill related to business divestitures |  |  |  | 1 |  |
Building Solutions EMEA/LA | Individually Immaterial Acquisitions |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  | $ 1 |  |
Tyco International Holding S.a.r.L. (TSarL) [Member] |  |  |  |  |  |
Acquisitions And Discontinued Operations [Line Items] |  |  |  |  |  |
Repayments of Debt |  |  | $ 1,900 |  |  |
Long-term Debt |  |  |  |  |  | $ 4,000

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