v3.26.1
Segment Information - Schedule of Disaggregation of Revenue by Geographical Market (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation of Revenue [Line Items]        
Consolidated net sales $ 3,929 $ 3,741 $ 11,438 $ 10,847
Inter-segment elimination        
Disaggregation of Revenue [Line Items]        
Consolidated net sales (20) (8) (67) (51)
United States        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 1,766 1,560 4,965 4,570
Mexico        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 721 656 2,043 1,870
Other Americas        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 107 66 265 211
Americas        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 1,928 1,760 5,454 5,070
Americas | Inter-segment elimination        
Disaggregation of Revenue [Line Items]        
Consolidated net sales (666) (522) (1,819) (1,581)
Germany        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 230 243 692 694
Poland        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 215 231 646 646
Czech Republic        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 170 176 524 532
Spain        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 182 192 575 552
Sweden        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 142 148 461 429
Romania        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 131 147 396 403
Other EMEA        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 432 443 1,291 1,276
EMEA        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 1,211 1,268 3,688 3,628
EMEA | Inter-segment elimination        
Disaggregation of Revenue [Line Items]        
Consolidated net sales (291) (312) (897) (904)
China        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 432 307 1,189 928
Thailand        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 104 125 345 379
Korea        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 106 133 336 406
Japan        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 111 101 336 314
Other Asia        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 79 71 219 223
Asia        
Disaggregation of Revenue [Line Items]        
Consolidated net sales 810 721 2,363 2,200
Asia | Inter-segment elimination        
Disaggregation of Revenue [Line Items]        
Consolidated net sales $ (22) $ (16) $ (62) $ (50)