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Restructuring and Related Costs - Schedule of Restructuring Reserve by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	$ 106	$ 81	$ 399	$ 844
Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	40		103		$ 276
Building Solutions North America | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	0		4
Building Solutions EMEA/LA | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	9		22
Building Solutions Asia Pacific | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	4		7
Global Products | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	20		56
Corporate | Various 2023 Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring costs and asset impairment charges	$ 7		$ 14

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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