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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2018
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
2018
 
2017
Warranty reserve liability
 
 
 
Beginning balance at January 1
$
4

 
$
5

Provisions for warranties issued
3

 
4

Settlements (in cash or in kind)
(4
)
 
(6
)
Balance at September 30
$
3

 
$
3