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Note 1. Significant Accounting Policies Earnings per Share (Tables)
 12 Months Ended
Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table shows the computation of basic and diluted earnings per share:
 
 
Year Ended
September 30,
(in millions, except per share data)
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
 
Net income (loss) attributable to Adient
 
$
877

 
$
(1,546
)
 
$
460

 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
Shares outstanding
 
93.5

 
93.7

 
93.7

Effect of dilutive securities
 
0.4

 
—

 
0.1

Diluted shares
 
93.9

 
93.7

 
93.8

 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
Basic
 
$
9.38

 
$
(16.50
)
 
$
4.91

Diluted
 
$
9.34

 
$
(16.50
)
 
$
4.90

Potentially dilutive securities whose effect would have been antidilutive are excluded from the computation of diluted earnings per share. For periods prior to the separation, basic and diluted earnings per ordinary share are calculated assuming the number of Adient ordinary shares outstanding on October 31, 2016 had been outstanding at the beginning of each period presented.