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Net Property
 3 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Net Property
Net Property
     Net property is summarized as follows (in millions):
 
December 31,
2018
 
September 30,
2018
Property at cost:
 
 
 
Land and land improvements
$
29

 
$
29

Buildings
227

 
228

Machinery and equipment
926

 
914

Company-owned tooling
132

 
130

Construction in progress
76

 
81

Total
1,390

 
1,382

Less: accumulated depreciation
(909
)
 
(899
)
Net property
$
481

 
$
483