Segment Information - Other Reconciling Items (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net Sales	$ 14,688	$ 15,395	$ 14,121
Equity Income	90	84	75
Total assets	9,351	9,424	9,158
Depreciation	285	290	298
Amortization of intangibles	47	50	52
Capital Expenditures	266	252	227
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates	1
China | Land
Segment Reporting Information [Line Items]
Gain on disposition of property plant equipment			7
YFAI
Segment Reporting Information [Line Items]
Purchase accounting amortization	1	2	2
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates		6	10
Restructuring charges		2	1
EMEA
Segment Reporting Information [Line Items]
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates		3	7
Non-cash impairment charges		3
Asia
Segment Reporting Information [Line Items]
(Gain) on sale of / impairment of nonconsolidated partially owned affiliates		3	3
Non-cash impairment charges		3
Loss on contract termination			7
Asia | China
Segment Reporting Information [Line Items]
Non-cash impairment charges		4
Reportable Segments | China
Segment Reporting Information [Line Items]
Net Sales	1,420	1,385	1,374
Reportable Segments | Americas
Segment Reporting Information [Line Items]
Net Sales	6,763	7,220	6,557
Equity Income	3	3	0
Total assets	2,863	3,122	3,073
Depreciation	127	133	130
Amortization of intangibles	12	12	12
Capital Expenditures	100	114	104
Reportable Segments | EMEA
Segment Reporting Information [Line Items]
Net Sales	5,029	5,195	4,764
Equity Income	15	16	12
Total assets	2,349	2,252	2,166
Depreciation	112	107	116
Amortization of intangibles	2	3	4
Capital Expenditures	107	81	73
Reportable Segments | Asia
Segment Reporting Information [Line Items]
Net Sales	2,989	3,085	2,926
Equity Income	73	71	76
Total assets	3,185	2,930	2,959
Depreciation	46	50	52
Amortization of intangibles	33	35	36
Capital Expenditures	59	57	50
Reconciling items
Segment Reporting Information [Line Items]
Net Sales		(105)	(126)
Equity Income	(1)	(6)	(13)
Total assets	954	1,120	960
Depreciation	0	0	0
Amortization of intangibles	0	0	0
Capital Expenditures	$ 0	$ 0	$ 0