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Other Current Assets (Tables)
 6 Months Ended
Mar. 31, 2018
Other Current Assets Disclosure [Abstract]  
Summary of other current assets
Other current assets are summarized as follows (in millions):
 
March 31,
2018
 
September 30,
2017
Asbestos-related recoveries (see Note 20)
$
10

 
$
14

Prepaid and other
31

 
29

Other current assets
$
41

 
$
43