STOCK-BASED COMPENSATION - Summary of Activity for Stock Options (Details) - Employee Stock Option - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Balance, beginning of period (in shares)	152,746
Exercised (in shares)	(3,768)
Expired (in shares)	(281)
Forfeited, (in shares)	(12,846)
Balance, end of period (in shares)	135,851	152,746
Exercisable, (in shares)	836
Weighted-average Exercise Price
Balance, beginning of period (in dollars per share)	$ 1,401
Exercised (in dollars per share)	1,212
Expired (in dollars per share)	716
Forfeited (in dollars per share)	1,411
Balance, end of period (in dollars per share)	1,407	$ 1,401
Exercisable (in dollars per share)	$ 788
Aggregate Intrinsic Value (in millions)
Balance	$ 135	$ 126
Exercisable	$ 1
Weighted-average Remaining Contractual Term (in years)
Balance	8 years 3 months 18 days	9 years 3 months 18 days
Exercisable	1 year 9 months 18 days