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Net Property
 9 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Net Property Net Property
     Net property is summarized as follows (in millions):
 
June 30,
2019
 
September 30,
2018
Property at cost:
 
 
 
Land and land improvements
$
30

 
$
29

Buildings
228

 
228

Machinery and equipment
928

 
914

Company-owned tooling
136

 
130

Construction in progress
66

 
81

Total
1,388

 
1,382

Less: accumulated depreciation
(907
)
 
(899
)
Net property
$
481

 
$
483