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STOCK INCENTIVE PLANS - Restricted Stock Units (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding at beginning of period (in shares)	317,414	326,124	343,814
Issued (in shares)	105,866	140,815	96,823
Canceled (in shares)	(36,134)	(26,254)	(36,224)
Vested (in shares)	(184,825)	(123,271)	(78,289)
Outstanding at end of period (in shares)	202,321	317,414	326,124
Weighted Average Price Per Share [Abstract]
Outstanding at beginning of period, weighted average price per share (in dollars per share)	$ 259.67	$ 259.88	$ 245.38
Issued, weighted average price per share (in dollars per share)	406.17	252.11	299.25
Cancelled, weighted average price per share (in dollars per share)	274.74	257.56	253.22
Vested, weighted average price per share (in dollars per share)	276.34	252.05	247.96
Outstanding at end of period, weighted average price per share (in dollars per share)	$ 318.40	$ 259.67	$ 259.88
Fair value of shares vested	$ 51	$ 31	$ 19

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Share-Based Compensation Fair Value of Vested Restricted Stock Units

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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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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