DISCONTINUED OPERATIONS - Financial Results (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 0	$ 0	$ 3,205
Cost of sales	0	0	2,029
SG&A	1	0	397
Gain on sale of business	0	(539)	(13,393)
Other deductions, net	(5)	104	264
Earnings before income taxes	4	435	13,908
Income taxes	(4)	85	2,969
Earnings, net of tax	8	350	10,939
Climate Technologies
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0	0	3,156	$ 5,000
Cost of sales	0	0	2,000
SG&A	1	0	390
Gain on sale of business	0	(539)	(10,610)
Other deductions, net	(10)	104	252
Earnings before income taxes	9	435	11,124
Income taxes	(3)	85	2,315
Earnings, net of tax	12	350	8,809
ISE
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	0	0	49
Cost of sales	0	0	29
SG&A	0	0	7
Gain on sale of business	0	0	(2,783)
Other deductions, net	5	0	12
Earnings before income taxes	(5)	0	2,784
Income taxes	(1)	0	654
Earnings, net of tax	$ (4)	$ 0	$ 2,130