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Contingencies (Tables)
 3 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of environmental reserves
The following are the components of the Superfund and non-Superfund environmental reserves (in millions):
 
Superfund Sites
 
Non-Superfund Sites
 
Total
Beginning balance at September 30, 2017
$
2

 
$
7

 
$
9

Payments and other
—

 
(1
)
 
(1
)
Accruals
—

 
1

 
1

Balance at December 31, 2017
$
2

 
$
7

 
$
9
Asbestos related reserves and recoveries
Maremont’s asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
December 31,
2017
 
September 30,
2017
Pending and future claims
$
68

 
$
68

Billed but unpaid claims
1

 
2

Asbestos-related liabilities
$
69

 
$
70

Asbestos-related insurance recoveries
$
21

 
$
25

The Rockwell legacy asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
December 31,
2017
 
September 30,
2017
Pending and future claims
$
63

 
$
63

Billed but unpaid claims
1

 
2

Asbestos-related liabilities
$
64

 
$
65

Asbestos-related insurance recoveries
$
38

 
$
38