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Acquisitions and Divestitures Divestitures (Details) $ in Millions	3 Months Ended							12 Months Ended
	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Divestitures [Line Items]
Business divestitures, net of cash divested								$ 2,202	$ 220	$ 32
Goodwill, written off related to divestiture								35	1,269
Gain on divestitures - net								114	$ 0	$ 0
Building Solutions North America
Divestitures [Line Items]
Proceeds from divestitures							$ 16
Goodwill, written off related to divestiture							$ 3
Series of Individually Immaterial Business Acquisitions [Member]
Divestitures [Line Items]
Number of Businesses Acquired									3	2
Nonredeemable Noncontrolling Interest
Divestitures [Line Items]
Proceeds from divestitures									$ 4
Scott Safety business [Member]
Divestitures [Line Items]
Business divestitures, net of cash divested				$ 2,000
Gain (loss) on divestiture				114
Goodwill, written off related to divestiture				1,200
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax				84
Income tax expense from disposal				30
ADT security business in South Africa [Member] | Building Solutions EMEA/LA
Divestitures [Line Items]
Business divestitures, net of cash divested					$ 129
Goodwill, written off related to divestiture					$ 92
Business Divestitures, Not Specific
Divestitures [Line Items]
Number of businesses divested						2			2
Proceeds from divestitures									$ 44
Business divestitures, net of cash divested									40	$ 29
Cash Divested from Deconsolidation									5
Business Divestitures, Not Specific | Global Products
Divestitures [Line Items]
Proceeds from divestitures						$ 39		204
Goodwill, written off related to divestiture						16		$ 35	19
Cash Divested from Deconsolidation						13
Business Divestitures, Not Specific | Building Solutions Asia Pacific
Divestitures [Line Items]
Goodwill, written off related to divestiture									$ 2
Controlling to Noncontrolling interest [Member]
Divestitures [Line Items]
Number of businesses divested									1
Tyco International Holding S.a.r.L. (TSarL) [Member]
Divestitures [Line Items]
Repayments of Debt	$ 450	$ 400	$ 26	$ 1,900					$ 300
Long-term Debt						$ 4,000				$ 4,000
Prior year business divestitures [Member] | Business Divestitures, Not Specific
Divestitures [Line Items]
Business divestitures, net of cash divested									$ 52

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