PENSION AND POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension contribution		$ 46	$ 38	$ 43
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Total accumulated benefit obligation		3,769	3,942
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, projected benefit obligation		567	558
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, accumulated benefit obligation		473	470
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, plan assets		130	125
Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation		493	515
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation		431	452
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets		71	92
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Future benefit payments, 2026		6
Future benefit payments, 2027		6
Future benefit payments, 2028		6
Future benefit payments, 2029		6
Future benefit payments, 2030		6
Total future benefit payments, 2031 - 2035		23
Benefit obligation, ending (recognized in balance sheet)		61	71
Deferred actuarial gains in accumulated other comprehensive income		59	68
Pension income		11	18	19
Benefits paid		8	10
Private Equity Funds | Measured at NAV | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Unfunded commitments for private equity funds		$ 71
Period distributions of underlying assets are expected to occur		10 years
Forecast | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension contribution	$ 40
U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)		$ 100	$ 14	$ (2)
Discount rate		5.27%	4.97%	6.03%
Over (Under) funded plans		$ 856
Unfunded plans		161
Future benefit payments, 2026		265
Future benefit payments, 2027		263
Future benefit payments, 2028		258
Future benefit payments, 2029		254
Future benefit payments, 2030		248
Total future benefit payments, 2031 - 2035		1,148
Benefit obligation, ending (recognized in balance sheet)		856	$ 800
Pension income		40	116	$ 113
Benefits paid		227	205
Non-U.S. Plans | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)		$ 95	$ 107	$ 98
Discount rate		5.20%	4.70%	5.20%
Over (Under) funded plans		$ (65)
Unfunded plans		242
Future benefit payments, 2026		67
Future benefit payments, 2027		64
Future benefit payments, 2028		70
Future benefit payments, 2029		74
Future benefit payments, 2030		71
Total future benefit payments, 2031 - 2035		396
Benefit obligation, ending (recognized in balance sheet)		(65)	$ (38)
Pension income		(28)	(37)	$ (49)
Benefits paid		$ 40	$ 41
Discontinued Operations | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension expense (income)				7
Defined contribution plan, expense				$ 14