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Contingencies (Tables)
 3 Months Ended
Dec. 31, 2016
Loss Contingencies [Line Items]  
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
—

 
(2
)
 
(2
)
Accruals
—

 
1

 
1

Balance at December 31, 2016
$
2

 
$
10

 
$
12
Maremont Asbestos  
Loss Contingencies [Line Items]  
Asbestos related reserves and recoveries
Maremont’s asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
December 31,
2016
 
September 30,
2016
Pending and future claims
$
70

 
$
70

Billed but unpaid claims
3

 
2

Asbestos-related liabilities
$
73

 
$
72

Asbestos-related insurance recoveries
$
31

 
$
32
Rockwell Asbestos  
Loss Contingencies [Line Items]  
Asbestos related reserves and recoveries
The Rockwell legacy asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions):
 
December 31,
2016
 
September 30,
2016
Pending and future claims
$
60

 
$
60

Billed but unpaid claims
2

 
1

Asbestos-related liabilities
$
62

 
$
61

Asbestos-related insurance recoveries
$
27

 
$
27