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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Warranty Reserve Activity
The following table identifies the activity relating to the warranty reserve for the six months ended June 30:
In millions
2017
 
2016
Warranty reserve liability
 
 
 
Beginning balance at January 1
$
5

 
$
6

Provisions for warranties issued
3

 
4

Settlements (in cash or in kind)
(4
)
 
(5
)
Balance at June 30
$
4

 
$
5