ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, beginning balance	$ 26,598	$ 16,316
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Stockholders' equity, ending balance	27,509	26,598	$ 16,316
Accumulated other comprehensive income (loss)	(868)	(1,253)	(1,485)
Foreign currency translation, tax	17	26	(62)
Actuarial gains (losses) deferred during the period, tax expense (benefit)	14	0	(10)
Amortization of deferred actuarial (income) losses into earnings, tax benefit	(12)	(17)	21
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, beginning balance	(1,253)	(1,485)	(872)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Stockholders' equity, ending balance	(868)	(1,253)	(1,485)
Foreign currency translation
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, beginning balance	(1,012)	(1,265)	(629)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other comprehensive income (loss), net of tax of $(62), $26 and $17, respectively	356	158	(636)
Reclassification to loss on divestiture of business	23	95	0
Reclassification to gain on sale of equity interest	17	0	0
Stockholders' equity, ending balance	(616)	(1,012)	(1,265)
Pension and postretirement
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, beginning balance	(247)	(222)	(259)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification to loss on divestiture of business	0	22	0
Actuarial gains (losses) deferred during the period, net of taxes of $10, $0 and $(14), respectively	45	4	(33)
Amortization of deferred actuarial losses into earnings, net of tax of $(21), $17 and $12, respectively	(43)	(51)	70
Stockholders' equity, ending balance	(245)	(247)	(222)
Cash flow hedges
Accumulated other comprehensive income [Roll Forward]
Stockholders' equity, beginning balance	6	2	16
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Reclassification to loss on divestiture of business	0	(19)	0
Gains deferred during the period, net of taxes of $(6), $(11) and $1, respectively	(5)	37	18
Reclassifications of realized (gains) losses to sales and cost of sales, net of tax of $10, $4 and $2, respectively	(8)	(14)	(32)
Stockholders' equity, ending balance	(7)	6	2
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Gains deferred during the period, tax expense	(6)	(11)	1
Reclassification of (gains) losses to sales and cost of sales, tax	$ 4	$ 10	$ 2