PENSION AND POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation		$ 3,942	$ 3,719
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, projected benefit obligation		558	519
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, accumulated benefit obligation		470	435
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, plan assets		125	118
Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation		515	469
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation		452	413
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets		92	77
Pension contribution		38	43	$ 43
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)			7	16
Defined contribution plan, expense			14	32
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Future benefit payments, 2025		7
Future benefit payments, 2026		7
Future benefit payments, 2027		7
Future benefit payments, 2028		7
Future benefit payments, 2029		7
Total future benefit payments, 2030 - 2034		27
Benefit obligation, ending (recognized in balance sheet)		71	72
Deferred actuarial gains in accumulated other comprehensive income		68	95
Pension income		18	19	12
Benefits paid		10	9
Private Equity Funds | Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments for private equity funds		$ 90
Period distributions of underlying assets are expected to occur		10 years
Forecast
Defined Benefit Plan Disclosure [Line Items]
Pension contribution	$ 40
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)		$ 14	$ (2)	$ 121
Discount rate		4.97%	6.03%	5.64%
Over (Under) funded plans		$ 800
Unfunded plans		161
Future benefit payments, 2025		272
Future benefit payments, 2026		262
Future benefit payments, 2027		260
Future benefit payments, 2028		255
Future benefit payments, 2029		250
Total future benefit payments, 2030 - 2034		1,165
Benefit obligation, ending (recognized in balance sheet)		800	$ 656
Pension income		116	113	$ 3
Benefits paid		205	204
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)		$ 107	$ 98	$ 57
Discount rate		4.70%	5.20%	4.90%
Over (Under) funded plans		$ (38)
Unfunded plans		230
Future benefit payments, 2025		63
Future benefit payments, 2026		61
Future benefit payments, 2027		64
Future benefit payments, 2028		68
Future benefit payments, 2029		73
Total future benefit payments, 2030 - 2034		374
Benefit obligation, ending (recognized in balance sheet)		(38)	$ (62)
Pension income		(37)	(49)	$ (5)
Benefits paid		$ 41	$ 42