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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2019
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
2019
 
2018
Warranty reserve liability
 
 
 
Beginning balance at January 1
$
3

 
$
4

Accrual of warranties issued
2

 
3

Settlements (in cash or in kind)
(3
)
 
(4
)
Balance at September 30
$
2

 
$
3