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Contingencies (Tables)
 6 Months Ended
Mar. 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, 2016
$
2

 
$
11

 
$
13

Payments and other
—

 
(3
)
 
(3
)
Accruals
—

 
2

 
2

Balance at March 31, 2017
$
2

 
$
10

 
$
12
Asbestos related reserves and recoveries
Maremont’s asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
March 31,
2017
 
September 30,
2016
Pending and future claims
$
70

 
$
70

Billed but unpaid claims
3

 
2

Asbestos-related liabilities
$
73

 
$
72

Asbestos-related insurance recoveries
$
29

 
$
32

The Rockwell legacy asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
March 31,
2017
 
September 30,
2016
Pending and future claims
$
60

 
$
60

Billed but unpaid claims
6

 
1

Asbestos-related liabilities
$
66

 
$
61

Asbestos-related insurance recoveries
$
27

 
$
27