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Acquisitions and Divestitures Divestitures (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2020	Jun. 30, 2019	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Divestitures [Line Items]
Proceeds from divestitures				$ 2	$ 4	$ 0
Business divestitures, net of cash divested				135	12	2,202
Goodwill, written off related to divestiture				11	23
Gain on divestitures - net				0	0	114
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
Business Divestitures, Not Specific
Divestitures [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 152			$ 152	18
Business divestitures, net of cash divested	135				16
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
Business Divestitures, Not Specific | Building Solutions Asia Pacific
Divestitures [Line Items]
Goodwill, written off related to divestiture	$ 11
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

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