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Restructuring Costs (Tables)
 3 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of changes in restructuring reserves
The changes in restructuring reserves for the three months ended December 31, 2017 and 2016 are as follows (in millions):
 
Employee
Termination
Benefits
 
Plant
Shutdown
& Other
 
Total
Beginning balance at September 30, 2017
$
5

 
$
1

 
$
6

Activity during the period:
 
 
 
 

Charges to continuing operations
2

 
—

 
2

Cash payments – continuing operations
(2
)
 
(1
)
 
(3
)
Total restructuring reserves at December 31, 2017
5

 
—

 
5

Less: non-current restructuring reserves
(2
)
 
—

 
(2
)
Restructuring reserves – current, at December 31, 2017
$
3

 
$
—

 
$
3

 
 
 
 
 
 
Balance at September 30, 2016
$
15

 
$
1

 
$
16

Activity during the period:
 
 
 
 
 
Charges to continuing operations
—

 
—

 
—

Cash payments – continuing operations
(3
)
 
—

 
(3
)
Total restructuring reserves at December 31, 2016
12

 
1

 
13

Less: non-current restructuring reserves
(2
)
 
—

 
(2
)
Restructuring reserves – current, at December 31, 2016
$
10

 
$
1

 
$
11