Segment Information - Schedule of Disaggregation of Revenue by Geographical Market (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 3,741	$ 3,716	$ 10,847	$ 11,126
Americas
Disaggregation of Revenue [Line Items]
Net sales	1,760	1,737	5,070	5,044
United States
Disaggregation of Revenue [Line Items]
Net sales	1,560	1,515	4,570	4,428
Mexico
Disaggregation of Revenue [Line Items]
Net sales	656	674	1,870	1,934
Other Americas
Disaggregation of Revenue [Line Items]
Net sales	66	77	211	224
EMEA
Disaggregation of Revenue [Line Items]
Net sales	1,268	1,288	3,628	3,926
Germany
Disaggregation of Revenue [Line Items]
Net sales	243	245	694	723
Poland
Disaggregation of Revenue [Line Items]
Net sales	231	237	646	735
Czech Republic
Disaggregation of Revenue [Line Items]
Net sales	176	179	532	594
Spain
Disaggregation of Revenue [Line Items]
Net sales	192	214	552	600
Sweden
Disaggregation of Revenue [Line Items]
Net sales	148	149	429	458
Other EMEA
Disaggregation of Revenue [Line Items]
Net sales	590	604	1,679	1,879
Asia
Disaggregation of Revenue [Line Items]
Net sales	721	712	2,200	2,224
China
Disaggregation of Revenue [Line Items]
Net sales	307	346	928	1,056
Thailand
Disaggregation of Revenue [Line Items]
Net sales	125	106	379	354
Korea
Disaggregation of Revenue [Line Items]
Net sales	133	129	406	379
Japan
Disaggregation of Revenue [Line Items]
Net sales	101	77	314	256
Other Asia
Disaggregation of Revenue [Line Items]
Net sales	71	67	223	216
Inter-segment elimination
Disaggregation of Revenue [Line Items]
Net sales	(8)	(21)	(51)	(68)
Inter-segment elimination | Americas
Disaggregation of Revenue [Line Items]
Net sales	(522)	(529)	(1,581)	(1,542)
Inter-segment elimination | EMEA
Disaggregation of Revenue [Line Items]
Net sales	(312)	(340)	(904)	(1,063)
Inter-segment elimination | Asia
Disaggregation of Revenue [Line Items]
Net sales	$ (16)	$ (13)	$ (50)	$ (37)