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Discontinued Operations Discontinued Operations, Income Statement Disclosures (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Adient shares received per 10 shares of Johnson Controls shares     1
Johnson Controls shares converted into one share of Adient     10
Income from discontinued operations attributable to noncontrolling interests $ 0 $ 9  
Loss from discontinued operations $ 0 $ (43)  
U.S. federal statutory income tax rate 21.00% 35.00%  
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales   $ 1,434  
Income from discontinued operations before income taxes   1  
Provision for income taxes on discontinued operations   35  
Income from discontinued operations attributable to noncontrolling interests   9  
Loss from discontinued operations   (43)  
Separation costs   $ 79