SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES , REVENUE RECOGNITION AND ADVERTISING COSTS (Details) - USD ($) $ in Millions |
3 Months Ended | |
---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
|
Accounting Policies [Abstract] | ||
Term of subscription-based license agreements (in years) | 1 year | |
Advertising expense | $ 33 | $ 23 |
Deferred sales commission, amortization period | 3 years |