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STOCK BASED COMPENSATION - Summary of Unrecognized Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
RSUs
Additional Disclosures for equity-based plans
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 63
Unrecognized compensation expense, expected to be recognized over a weighted-average period (in years)	2 years 5 months 19 days
RSAs
Additional Disclosures for equity-based plans
Unrecognized compensation expense of awards other than options, net of forfeitures	$ 9
Unrecognized compensation expense, expected to be recognized over a weighted-average period (in years)	2 years

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