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Restructuring Costs (Tables)
 9 Months Ended
Jun. 30, 2019
Restructuring and Related Activities [Abstract]  
Schedule of changes in restructuring reserves The changes in restructuring reserves for the nine months ended June 30, 2019 and 2018 are as follows (in millions):
 
Employee Termination Benefits
 
Plant Shutdown & Other
 
Total
Beginning Balance at September 30, 2018
$
4

 
$
—

 
$
4

Activity during the period:
 
 
 
 

Charges to continuing operations
(2
)
 
—

 
(2
)
Cash payments – continuing operations
(2
)
 
—

 
(2
)
Other
1

 
—

 
1

Total restructuring reserves at June 30, 2019
1

 
—

 
1

Less: non-current restructuring reserves
—

 
—

 
—

Restructuring reserves – current, at June 30, 2019
$
1

 
$
—

 
$
1

 
 
 
 
 
 
Balance at September 30, 2017
$
5

 
$
1

 
$
6

Activity during the period:
 
 
 
 
 
Charges to continuing operations
6

 
—

 
6

Cash payments – continuing operations
(6
)
 
(1
)
 
(7
)
Total restructuring reserves at June 30, 2018
5

 
—

 
5

Less: non-current restructuring reserves
(1
)
 
—

 
(1
)
Restructuring reserves – current, at June 30, 2018
$
4

 
$
—

 
$
4