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Other Current Assets (Tables)
 3 Months Ended
Dec. 31, 2018
Other Current Assets Disclosure [Abstract]  
Summary of other current assets
Other current assets are summarized as follows (in millions):
 
December 31,
2018
 
September 30,
2018
Asbestos-related recoveries (see Note 21)
$
8

 
$
16

Prepaid and other
44

 
30

Other current assets
$
52

 
$
46