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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis, Narrative (Details) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 16, 2019 USD ($) | Mar. 31, 2021 USD ($) appeal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Highly liquid investments, maturity period (or less) |  | 3 months
US Securities Litigation | Settled Litigation | NEW JERSEY |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Settlement, escrow fund included in restricted cash | $ | $ 1,210 | $ 1,210
Settlement, escrow fund included in restricted cash, number of objectors' appeals | appeal |  | 2

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