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Other Current Assets
 9 Months Ended
Jun. 30, 2019
Other Current Assets Disclosure [Abstract]  
Other Current Assets Other Current Assets
     Other current assets are summarized as follows (in millions):
 
June 30,
2019
 
September 30,
2018
Asbestos-related recoveries (see Note 21)
$
8

 
$
16

Prepaid and other
24

 
30

Other current assets
$
32

 
$
46