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Net Property
 3 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Net Property Net Property
     Net property is summarized as follows (in millions):
 
December 31,
2019
 
September 30,
2019
Property at cost:
 
 
 
Land and land improvements
$
31

 
$
31

Buildings
228

 
224

Machinery and equipment
962

 
935

Company-owned tooling
142

 
136

Construction in progress
67

 
74

Total
1,430

 
1,400

Less: accumulated depreciation
(913
)
 
(885
)
Net property
$
517

 
$
515