Segment Information - Other Reconciling Items (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total assets	$ 8,954	$ 9,351	$ 9,424
Investment in partially-owned affiliates	276	338	303
Equity income	68	90	84
Depreciation	279	285	290
Amortization	46	47	50
Capital Expenditures	245	266	252
Purchase accounting amortization	2
Restructuring charges	58	169	39
Gain on business divestitures	4	1
(Gain) on sale of / impairment of nonconsolidated partially-owned affiliates		1
TURKEY
Segment Reporting Information [Line Items]
Gain on business divestitures			4
YFAI
Segment Reporting Information [Line Items]
Purchase accounting amortization		2	2
Restructuring charges			2
(Gain) on sale of / impairment of nonconsolidated partially-owned affiliates			6
EMEA
Segment Reporting Information [Line Items]
Restructuring charges	51	159	40
Non-cash impairment charges			3
(Gain) on sale of / impairment of nonconsolidated partially-owned affiliates			3
Asia
Segment Reporting Information [Line Items]
Non-cash impairment charges			3
(Gain) on sale of / impairment of nonconsolidated partially-owned affiliates			3
Asia | China
Segment Reporting Information [Line Items]
Non-cash impairment charges			4
Reportable Segments | Americas
Segment Reporting Information [Line Items]
Total assets	2,850	2,863	3,122
Investment in partially-owned affiliates	3	28	27
Equity income	0	3	3
Depreciation	126	127	133
Amortization	11	12	12
Capital Expenditures	94	100	114
Reportable Segments | EMEA
Segment Reporting Information [Line Items]
Total assets	2,085	2,349	2,252
Investment in partially-owned affiliates	37	37	38
Equity income	17	15	15
Depreciation	106	112	107
Amortization	0	2	3
Capital Expenditures	105	107	81
Reportable Segments | Asia
Segment Reporting Information [Line Items]
Total assets	3,042	3,185	2,930
Investment in partially-owned affiliates	236	273	238
Equity income	54	73	72
Depreciation	47	46	50
Amortization	35	33	35
Capital Expenditures	46	59	57
Reconciling items
Segment Reporting Information [Line Items]
Total assets	977	954	1,120
Investment in partially-owned affiliates	0	0	0
Equity income	(3)	(1)	(6)
Depreciation	0	0	0
Amortization	0	0	0
Capital Expenditures	$ 0	$ 0	$ 0