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Other Current Assets
 9 Months Ended
Jun. 30, 2017
Other Current Assets Disclosure [Abstract]  
Other Current Assets
Other Current Assets
     Other current assets are summarized as follows (in millions):
 
June 30,
2017
 
September 30,
2016
Asbestos-related recoveries (see Note 20)
$
10

 
$
10

Prepaid and other
27

 
23

Other current assets
$
37

 
$
33