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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of Recent Approximate Asbestos Claims Activity
A summary of recent approximate asbestos claims activity follows. Because claims are often filed and disposed of by dismissal or settlement in large numbers, the amount and timing of settlements and the number of open claims during a particular period can fluctuate significantly.
(Dollars in millions)
2017
 
2016
 
2015
Pending claims, beginning of year
64,400

 
67,400

 
73,800

New claims filed during the year
1,900

 
1,900

 
1,900

Claims settled/dismissed during the year
(12,000
)
 
(4,900
)
 
(8,300
)
Pending claims, end of year
54,300

 
64,400

 
67,400

Payments(1)
$
16

 
$
20

 
$
19

(1)
Represents amount spent by us and our insurers on asbestos litigation defense and claim resolution.
Changes in the Warranty Reserve
The following table presents changes in the warranty reserve during 2017 and 2016:
(in millions)
 
2017
 
2016
Balance at January 1
 
$
19

 
$
17

   Payments made during the period
 
(27
)
 
(29
)
   Expense recorded during the period
 
24

 
31

   Translation adjustment
 
1

 
—

Balance at December 31
 
$
17

 
$
19