v3.26.1
Equity and Noncontrolling Interests - Schedule of Stockholders Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance $ 2,017 $ 1,949 $ 2,063 $ 2,443
Net income (loss) 36 50 62 (256)
Foreign currency translation adjustments 5 123 (16) (12)
Realized and unrealized gains (losses) on derivatives 11 22 (5) 31
Dividends attributable to noncontrolling interests (34) (27) (53) (42)
Purchase of noncontrolling interest       (28)
Repurchases of common stock (30) (50) (55) (75)
Share based compensation and other 8 7 17 13
Stockholders' equity, ending balance 2,013 2,074 2,013 2,074
Shareholders' Equity Attributable to Adient        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance 1,713 1,652 1,766 2,134
Net income (loss) 25 36 30 (299)
Foreign currency translation adjustments 2 118 (24) (10)
Realized and unrealized gains (losses) on derivatives 11 22 (5) 31
Purchase of noncontrolling interest       (9)
Repurchases of common stock (30) (50) (55) (75)
Share based compensation and other 8 7 17 13
Stockholders' equity, ending balance 1,729 1,785 1,729 1,785
Ordinary Shares        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance 0 0 0 0
Stockholders' equity, ending balance 0 0 0 0
Additional Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance 3,586 3,686 3,602 3,712
Purchase of noncontrolling interest       (7)
Repurchases of common stock (30) (50) (55) (75)
Share based compensation and other 8 7 17 13
Stockholders' equity, ending balance 3,564 3,643 3,564 3,643
Retained Earnings (Accumulated Deficit)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (1,161) (1,220) (1,166) (885)
Net income (loss) 25 36 30 (299)
Stockholders' equity, ending balance (1,136) (1,184) (1,136) (1,184)
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance (712) (814) (670) (693)
Foreign currency translation adjustments 2 118 (24) (10)
Realized and unrealized gains (losses) on derivatives 11 22 (5) 31
Purchase of noncontrolling interest       (2)
Stockholders' equity, ending balance (699) (674) (699) (674)
Shareholders' Equity Attributable to Noncontrolling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Stockholders' equity, beginning balance 304 297 297 309
Net income (loss) 11 14 32 43
Foreign currency translation adjustments 3 5 8 (2)
Dividends attributable to noncontrolling interests (34) (27) (53) (42)
Purchase of noncontrolling interest       (19)
Stockholders' equity, ending balance $ 284 $ 289 $ 284 $ 289