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Acquisitions and Divestitures (Details)
¥ in Millions, ¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2023
USD ($)
Apr. 30, 2023
JPY (¥)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
JPY (¥)
Sep. 30, 2022
USD ($)
affiliate
Sep. 30, 2022
JPY (¥)
affiliate
Nov. 30, 2023
USD ($)
Nov. 30, 2023
CNY (¥)
Oct. 31, 2023
Business Acquisition [Line Items]                    
Goodwill     $ 2,164 $ 2,094   $ 2,057        
TURKEY                    
Business Acquisition [Line Items]                    
Expected proceeds assets held for sale           46        
YFAS                    
Business Acquisition [Line Items]                    
Expected proceeds assets held for sale           $ 693        
Number of nonconsolidated partially-owned affiliates | affiliate           2 2      
YFAT                    
Business Acquisition [Line Items]                    
Business combination, deposit to acquire interest in joint venture       11 ¥ 75 $ 12 ¥ 75      
Business combination, deposit, percent of total consideration           50.00%        
Goodwill $ 13                  
Cash acquired 5                  
KEIPER Seating Mechanisms Co., Ltd | YFAT                    
Business Acquisition [Line Items]                    
Net purchase consideration $ 23 ¥ 150                
Asia                    
Business Acquisition [Line Items]                    
Goodwill     1,217 $ 1,168   $ 1,155        
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd                    
Business Acquisition [Line Items]                    
Subsidiary, ownership percentage disposed               51.00% 51.00%  
Consideration for disposal group               $ 6 ¥ 44  
Deconsolidated cash               9    
Loss on disposal     $ 8              
Disposed of By Sale | Adient (Langfang) Seating Co., Ltd | Asia                    
Business Acquisition [Line Items]                    
Disposal group, including discontinued operation, goodwill               $ 5    
Assets Held for Sale | Adient (Langfang) Seating Co., Ltd                    
Business Acquisition [Line Items]                    
Subsidiary, ownership percentage disposed                   100.00%
Assets Held for Sale | Entities in China and Properties in U.S.                    
Business Acquisition [Line Items]                    
Impairment of assets held for sale           $ 6