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DEFERRED REVENUE (Tables)
 6 Months Ended
Jun. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Revenue for Extended Transmission Coverage Activity
Deferred revenue activity consists of the following (dollars in millions):
 
Three months ended June 30,
 
Six months ended June 30,
 
2019
 
2018
 
2019
 
2018
Beginning balance
$
131

 
$
112

 
$
122

 
$
110

Increases
11

 
23

 
29

 
33

Revenue earned
(9
)
 
(10
)
 
(18
)
 
(18
)
Ending balance
$
133

 
$
125

 
$
133

 
$
125