STOCK-BASED COMPENSATION - Long-Term Stock Awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unvested stock award shares
Forfeited (in shares)		11,100
Long-term stock awards
Unvested stock award shares
Balance at the beginning of the period (in shares)	1,000,000	2,000,000	2,000,000
Granted (in shares)	0	0	1,000,000
Vested (in shares)	0	1,000,000	1,000,000
Forfeited (in shares)	0	0	0
Balance at the end of the period (in shares)	1,000,000	1,000,000	2,000,000
Weighted average grant date fair value
Balance at the beginning of the period (in dollars per share)	$ 36	$ 34	$ 30
Granted (in dollars per share)	0	0	36
Vested (in dollars per share)	34	32	25
Forfeited (in dollars per share)	36	35	35
Balance at the end of the period (in dollars per share)	$ 37	$ 36	$ 34
Additional disclosures
Total unrecognized compensation expense	$ 10	$ 21	$ 41
Remaining weighted average vesting period	2 years	2 years	3 years
Total market value (at the vesting date) of stock award shares	$ 28	$ 31	$ 31