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Acquisitions and Divestitures Divestitures (Details) $ in Millions	3 Months Ended			12 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Divestitures [Line Items]
Proceeds from divestitures				$ 4	$ 0	$ 0
Business divestitures, net of cash divested				12	2,202	168
Goodwill, written off related to divestiture				23	35
Gain on divestitures - net				0	114	$ 0
Series of Individually Immaterial Business Acquisitions [Member]
Divestitures [Line Items]
Number of Businesses Acquired						3
Power Solutions
Divestitures [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 13,200
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	4,000
Disposal Group, Discontinued Operations, Consideration, net	11,600
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	$ 5,200			5,200
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]
Disposal Group, Including Discontinued Operation, Consideration				18
Number of businesses divested						2
Proceeds from divestitures						$ 44
Business divestitures, net of cash divested				16		40
Cash Divested from Deconsolidation						5
Business Divestitures, Not Specific | Building Solutions EMEA/LA
Divestitures [Line Items]
Goodwill, written off related to divestiture				$ 1
Business Divestitures, Not Specific | Global Products
Divestitures [Line Items]
Proceeds from divestitures					204
Goodwill, written off related to divestiture					35	19
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		$ 1,900
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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