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REVENUE RECOGNITION (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
Summary of the Activity of Deferred Revenue
The following table summarizes the activity of deferred revenue for the years ended December 31, 2019 and 2018:
 
Year Ended December 31,
2019
 
2018
Balance, beginning of year
$
149

 
$
151

Revenues recognized from the beginning balance
(134
)
 
(109
)
Cancellations
(15
)
 
(10
)
One-time adjustment to retained earnings at adoption of ASC 606
—

 
(32
)
Payments received from travelers net of amounts estimated to be payable to travel
  service providers and other
220

 
149

Balance, end of year
$
220

 
$
149