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OTHER LONG-TERM LIABILITIES
 12 Months Ended
Dec. 31, 2019
Payables and Accruals [Abstract]  
OTHER LONG-TERM LIABILITIES OTHER LONG-TERM LIABILITIES

Other long-term liabilities consist of the following:
 
December 31,
(Dollars in millions)
2018
 
2019
Asset retirement obligations
$
13

 
$
15

Employee related obligations
15

 
15

Operating lease liabilities
—

 
6

Deferred compensation
3

 
4

Other
1

 
1

Other long-term liabilities
$
32

 
$
41