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Segment Information - (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment 3   3  
Becoming Adient Costs - non cash   $ 5   $ 11
Stock base compensation excluded $ 2 12 $ 8 22
Depreciation expense excluded 72 101 137 197
US tax reform impact at YFAI 64 (28) 74 237
Prior period adjustments   8    
Other pension income 0 (7) (2) (8)
SS&M        
Segment Reporting Information [Line Items]        
Non-recurring consulting fee   7    
Costs Associated With Becoming An Independent Company        
Segment Reporting Information [Line Items]        
Stock base compensation excluded       8
Restructuring Related Charges        
Segment Reporting Information [Line Items]        
Depreciation expense excluded       4
Futuris        
Segment Reporting Information [Line Items]        
Futuris integration cost $ 2 7 $ 3 6
Corporate Joint Venture | YFAI        
Segment Reporting Information [Line Items]        
US tax reform impact at YFAI       8
Accounting Standards Update 2017-07        
Segment Reporting Information [Line Items]        
Other pension income   $ 6   $ 6