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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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