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Segment Information - (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
USD ($)
Mar. 31, 2019
segment
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments | segment   3   3  
Becoming Adient Costs - non cash     $ 1   $ 12
Stock base compensation excluded $ 8   12 $ 16 34
Depreciation expense excluded 68   103 205 300
Acquisition related costs 2     3  
US tax reform impact at YFAI 338   (13) 412 224
Prior period adjustments         8
Other pension income 5   (10) 3 (18)
SS&M          
Segment Reporting Information [Line Items]          
Non-recurring consulting fee     4   11
Costs Associated With Becoming An Independent Company          
Segment Reporting Information [Line Items]          
Stock base compensation excluded         9
Restructuring Related Charges          
Segment Reporting Information [Line Items]          
Depreciation expense excluded         6
Futuris          
Segment Reporting Information [Line Items]          
Business transaction costs 1   6 $ 3 19
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     9   15
Restatement Adjustment | Accounting Standards Update 2017-07          
Segment Reporting Information [Line Items]          
Other pension income     $ 10   $ 18
Restatement Adjustment | Prior period expense incurred but not reported          
Segment Reporting Information [Line Items]          
Cost of sales $ 8