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Acquisitions and Divestitures (Details)
¥ in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2023
USD ($)
Apr. 30, 2023
CNY (¥)
Mar. 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2023
CNY (¥)
Sep. 30, 2022
USD ($)
Sep. 30, 2022
CNY (¥)
Nov. 30, 2023
USD ($)
Nov. 30, 2023
CNY (¥)
Oct. 31, 2023
Business Acquisition [Line Items]                    
Goodwill     $ 2,099 $ 2,094            
YFAT                    
Business Acquisition [Line Items]                    
Business combination, deposit to acquire interest in joint venture       11 ¥ 75 $ 12 ¥ 75      
Percent of total consideration           50.00% 50.00%      
Goodwill $ 13                  
Acquisition of businesses, net of cash acquired 5                  
KEIPER | YFAT                    
Business Acquisition [Line Items]                    
Net purchase consideration $ 23 ¥ 150                
Asia                    
Business Acquisition [Line Items]                    
Goodwill     1,164 $ 1,168            
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]                    
Goodwill               $ 5    
Assets Held For Sale | Adient (Langfang) Seating Co., Ltd                    
Business Acquisition [Line Items]                    
Subsidiary, ownership percentage disposed                   100.00%