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Stock-Based Compensation - Stock Appreciation Rights (Details) - Stock appreciation rights (SARs)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Weighted Average SAR Price  
Shares outstanding, weighted average exercise price at beginning period (in dollars per share) | $ / shares $ 30.24
Shares exercised, weighted average exercise price (in dollars per share) | $ / shares 26.85
Shares forfeited or expired, weighted average exercise price (in dollars per share) | $ / shares 25.12
Shares outstanding, weighted average exercise price at ending period (in dollars per share) | $ / shares 32.78
Shares exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 32.78
Shares Subject to SAR  
Shares outstanding at beginning of period (In shares) | shares 171,100
Shares exercised (in shares) | shares (105,377)
Shares forfeited or expired (In shares) | shares (14,987)
Shares outstanding at ending of period (In shares) | shares 291,464
Shares exercisable (in shares) | shares 171,100
Weighted Average Remaining Contractual Life (years)  
Shares outstanding, weighted average remaining contractual life 2 years 4 months 24 days
Shares exercisable, weighted average remaining contractual life 2 years 4 months 24 days
Aggregate Intrinsic Value (in millions)  
Shares outstanding, aggregate intrinsic value | $ $ 2
Shares exercisable, aggregate intrinsic value | $ $ 2
Former Parent plan  
Weighted Average SAR Price  
Shares exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 32.48
Shares Subject to SAR  
Shares exercisable (in shares) | shares 154,857
Weighted Average Remaining Contractual Life (years)  
Shares exercisable, weighted average remaining contractual life 2 years 4 months 24 days
Aggregate Intrinsic Value (in millions)  
Shares exercisable, aggregate intrinsic value | $ $ 2
Adient plan  
Weighted Average SAR Price  
Shares exercisable, weighted average exercise price (in dollars per share) | $ / shares $ 35.72
Shares Subject to SAR  
Shares exercisable (in shares) | shares 16,243
Weighted Average Remaining Contractual Life (years)  
Shares exercisable, weighted average remaining contractual life 2 years 4 months 24 days
Aggregate Intrinsic Value (in millions)  
Shares exercisable, aggregate intrinsic value | $ $ 0