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Stock-Based Compensation - Stock Options (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Weighted Average Option Price  
Outstanding options, weighted average exercise price at beginning period (in dollars per share) | $ / shares $ 38.25
Options exercised, weighted average exercise price (in dollars per share) | $ / shares 27.53
Options forfeited, expired or converted, weighted average exercise price (in dollars per share) | $ / shares 26.79
Outstanding options, weighted average exercise price at ending period (in dollars per share) | $ / shares 40.09
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 40.09
Shares Subject to Option  
Options outstanding at beginning period (in shares) | shares 591,630
Options exercised (in shares) | shares (50,900)
Options forfeited, expired or converted (in shares) | shares (29,231)
Options outstanding at ending period (in shares) | shares 511,499
Options exercisable (in shares) | shares 511,499
Weighted Average Remaining Contractual Life (years)  
Options outstanding, weighted average remaining contractual life 3 years 4 months 24 days
Options exercisable, weighted average remaining contractual life 3 years 4 months 24 days
Aggregate Intrinsic Value (in millions)  
Options outstanding, aggregate intrinsic value | $ $ 2
Options exercisable, aggregate intrinsic value | $ $ 2
Former Parent plan  
Weighted Average Option Price  
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 40.29
Shares Subject to Option  
Options exercisable (in shares) | shares 437,562
Weighted Average Remaining Contractual Life (years)  
Options exercisable, weighted average remaining contractual life 3 years 6 months
Aggregate Intrinsic Value (in millions)  
Options exercisable, aggregate intrinsic value | $ $ 2
Adient plan  
Weighted Average Option Price  
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 38.93
Shares Subject to Option  
Options exercisable (in shares) | shares 73,937
Weighted Average Remaining Contractual Life (years)  
Options exercisable, weighted average remaining contractual life 2 years 8 months 12 days
Aggregate Intrinsic Value (in millions)  
Options exercisable, aggregate intrinsic value | $ $ 0
Former Parent and Adient plan  
Weighted Average Option Price  
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 40.09
Shares Subject to Option  
Options exercisable (in shares) | shares 511,499
Weighted Average Remaining Contractual Life (years)  
Options exercisable, weighted average remaining contractual life 3 years 4 months 24 days
Aggregate Intrinsic Value (in millions)  
Options exercisable, aggregate intrinsic value | $ $ 2