FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level3) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) rate	Dec. 31, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 328	$ 316
Acquisition-related contingent consideration adjustments	11	48
Payments / Settlements	(99)	(36)
Foreign currency translation adjustment included in other comprehensive loss	1	0
Ending balance	241	328
Current portion	39	112
Non-current portion	202	216
Accretion for the time value of money
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration adjustments	17	23
Fair value adjustments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration adjustments	$ (6)	$ 25
Measurement Input, Weighted-Average Discount Rate \| Level 3 \| Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, contingent consideration obligations, discount rate \| rate	0.07
Minimum \| Measurement Input, Discount Rate \| Level 3 \| Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, contingent consideration obligations, discount rate \| rate	0.06
Maximum \| Measurement Input, Discount Rate \| Level 3 \| Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, contingent consideration obligations, discount rate \| rate	0.18

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled within one year or the normal operating cycle, if longer.

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Value of input used to measure contingent consideration liability from business combination.

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Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

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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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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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