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OTHER INCOME (EXPENSE), NET
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
OTHER INCOME (EXPENSE), NET
OTHER INCOME (EXPENSE), NET
Other income (expense), net consists of the following (dollars in millions):
 
Years ended December 31,
 
2018
 
2017
 
2016
Post-retirement benefit plan amendment credits
$
12

 
$
—

 
$
—

Vendor settlements
(4
)
 
(5
)
 
1

Technology-related investment expense
(3
)
 
(16
)
 
(1
)
Other
(2
)
 
(1
)
 
2

Total
$
3

 
$
(22
)
 
$
2