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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Warranty Reserve Activity
The following table identifies the activity relating to the warranty reserve for the nine months ended September 30:
In millions
2016
 
2015
Warranty reserve liability
 
 
 
Beginning balance at January 1
$
6

 
$
7

Provisions for warranties issued
6

 
6

Settlements (in cash or in kind)
(7
)
 
(8
)
Balance at September 30
$
5

 
$
5