STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Stock-based compensation
Grants in period, intrinsic value (in dollars per share)		$ 47
Forfeited (in shares)		11,100
Restricted stock units
Stock-based compensation
Granted (in shares)	669,980	445,670
Grants in period, intrinsic value (in dollars per share)	$ 57
Shares issued during period (in shares)	141,461
Forfeited (in shares)	29,125
Unrecognized compensation cost	$ 15	$ 7
Unrecognized compensation expense, recognition period	2 years	2 years
Total market value (at the vesting date) of stock award shares	$ 8

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options.

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