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Other Current Assets (Tables)
 3 Months Ended
Dec. 31, 2017
Other Current Assets Disclosure [Abstract]  
Summary of other current assets
Other current assets are summarized as follows (in millions):
 
December 31,
2017
 
September 30,
2017
Asbestos-related recoveries (see Note 21)
$
10

 
$
14

Prepaid and other
33

 
29

Other current assets
$
43

 
$
43