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Net Property
 9 Months Ended
Jun. 30, 2017
Property, Plant and Equipment [Abstract]  
Net Property
Net Property
     Net property is summarized as follows (in millions):
 
June 30,
2017
 
September 30,
2016
Property at cost:
 
 
 
Land and land improvements
$
29

 
$
30

Buildings
234

 
231

Machinery and equipment
867

 
839

Company-owned tooling
122

 
113

Construction in progress
38

 
56

Total
1,290

 
1,269

Less: accumulated depreciation
(860
)
 
(830
)
Net property
$
430

 
$
439