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Other Current Assets
 6 Months Ended
Mar. 31, 2017
Other Current Assets Disclosure [Abstract]  
Other Current Assets
Other Current Assets
     Other current assets are summarized as follows (in millions):
 
March 31,
2017
 
September 30,
2016
Asbestos-related recoveries (see Note 21)
$
10

 
$
10

Prepaid and other
32

 
23

Other current assets
$
42

 
$
33