STOCK-BASED COMPENSATION - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Outstanding at the beginning of the period (in shares)	2,000,000	3,000,000	4,000,000
Granted (in shares)	1,000,000	1,000,000	1,000,000
Exercised (in shares)	0	2,000,000	2,000,000
Forfeited (in shares)	0	0	0
Outstanding at the end of the period (in shares)	3,000,000	2,000,000	3,000,000
Option shares vested and expected to vest at the end of the period (in shares)	3,000,000	2,000,000	3,000,000
Option shares exercisable at the end of the period (in shares)	2,000,000	1,000,000	2,000,000
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 33	$ 27	$ 21
Granted (in dollars per share)	56	48	36
Exercised (in dollars per share)	25	17	13
Forfeited (in dollars per share)	11	40	34
Outstanding at the end of the period (in dollars per share)	37	33	27
Option shares vested and expected to vest at the end of the period (in dollars per share)	36	33	27
Option shares exercisable at the end of the period (in dollars per share)	$ 31	$ 28	$ 21
Aggregate intrinsic value
Option shares exercised	$ 5	$ 29	$ 33
Option shares vested and expected to vest at the end of the period	89	51	63
Option shares exercisable at the end of the period	$ 63	$ 35	$ 47
Weighted average remaining option term
Outstanding at the end of the period	6 years	6 years	6 years
Option shares vested and expected to vest at the end of the period	6 years	6 years	6 years
Option shares exercisable at the end of the period	5 years	5 years	4 years
Stock options
Shares
Granted (in shares)	331,970
Weighted average exercise price
Granted (in dollars per share)	$ 56
Additional disclosures
Total unrecognized compensation expense	$ 4	$ 6	$ 9
Remaining weighted average vesting period	2 years	2 years	3 years