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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis, Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 16, 2019 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Highly liquid investments, maturity period (or less) |  | 3 months
Valeant US Securities Litigation | New Jersey | Settled Litigation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Settlement, escrow fund included in restricted cash | $ 1,210 | $ 1,210

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