SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (in shares)	1,800,000
Number of shares available for grant (in shares)	1,400,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)	$ 161.42
Aggregate intrinsic value, vested (less than)	$ 46	$ 30	$ 34
SARs
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)	$ 70.66	$ 29.63	$ 28.89
Aggregate intrinsic value, vested (less than)	$ 5	$ 4	$ 4
Aggregate intrinsic value, exercised	$ 14	$ 19	$ 11
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (in shares)	500,000
Percentage of fair market value of common stock (not less than)	95.00%
Employees and Non Employee Directors \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value (in usd per share)		$ 95.92	$ 95.66
ILG, Inc \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Aggregate intrinsic value, vested (less than)	$ 3	$ 6	$ 15

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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