CONTINGENCIES - Additional Information (Details) $ in Millions				3 Months Ended	12 Months Ended
	Jul. 09, 2019 USD ($)	Jan. 22, 2019 USD ($)	Sep. 15, 2018 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2019 USD ($) site claim	Sep. 30, 2018 USD ($) claim	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Environmental contingencies accrued					$ 15	$ 17
Estimated environmental liabilities for ongoing operations, maintenance and monitoring discounted amount					13
Estimated environmental liabilities for ongoing operations, maintenance and monitoring undiscounted amount					15
Income (loss) related to remeasuring net asbestos liability					31	0	$ 0
Litigation settlement					$ 0	$ 2	0
Super Fund
Loss Contingencies [Line Items]
Number of superfund sites | site					10
Minimum
Loss Contingencies [Line Items]
Environmental liabilities discounted rate					2.25%
Maximum
Loss Contingencies [Line Items]
Environmental liabilities discounted rate					3.00%
Maremont Asbestos
Loss Contingencies [Line Items]
Net amount of damages sought		$ 51
Income (loss) related to remeasuring net asbestos liability		$ 31
Company contributions to trust in management of asbestos claims	$ 48
Period for settlement						41 years
Asbestos-related insurance recoveries						$ 24
Maremont Asbestos | Minimum
Loss Contingencies [Line Items]
Possible claims						107
Maremont Asbestos | Maximum
Loss Contingencies [Line Items]
Possible claims						195
Rockwell Asbestos
Loss Contingencies [Line Items]
Environmental contingencies accrued					$ 93	105
Period for settlement					40 years
Possible claims					$ 91	103
Asbestos-related insurance recoveries					$ 61	$ 68
Number of pending asbestos-related claims | claim					1,400	1,400
Period for incurring loss					40 years
Litigation settlement			$ 3
Insurance receivable			$ 28
Gain recognized associated with annual valuation						$ 40
Rockwell Asbestos | Minimum
Loss Contingencies [Line Items]
Possible claims					$ 91
Rockwell Asbestos | Maximum
Loss Contingencies [Line Items]
Possible claims					181
Superfund Sites
Loss Contingencies [Line Items]
Environmental costs reasonably possible					24
Environmental contingencies accrued					11	12
Environmental remediation costs					2	12
Non-Superfund Sites
Loss Contingencies [Line Items]
Environmental costs reasonably possible					14
Environmental contingencies accrued					4	5
Environmental remediation costs					2	2	3
Other Income (expense)
Loss Contingencies [Line Items]
Environmental remediation costs					$ 3	12	3
Insurance Settlement | Rockwell Asbestos
Loss Contingencies [Line Items]
Litigation settlement				$ 32
Litigation settlement expense				10		$ 12	$ 10
Loss contingency accrual				22
Insurance receivable				$ 12