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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Dec. 16, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Liabilities: |  |  |
Highly liquid investments, maturity period (or less) |  | 3 months |
US Securities Litigation | Settled Litigation | NEW JERSEY |  |  |
Liabilities: |  |  |
Settlement, escrow fund included in restricted cash | $ 1,210 | $ 1,010 |
Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Liabilities: |  |  |
Derivative Liabilities |  | 1 |
Recurring basis |  |  |
Assets: |  |  |
Cash equivalents |  | 423 | $ 2,696
Restricted cash |  | 1,011 | 1
Liabilities: |  |  |
Acquisition-related contingent consideration |  | 312 | 316
Recurring basis | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument |  |  |
Liabilities: |  |  |
Derivative Liabilities |  | 18 | 13
Recurring basis | Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Assets: |  |  |
Derivative Assets |  | 1 | 0
Liabilities: |  |  |
Derivative Liabilities |  | 2 | 0
Recurring basis | Level 1 |  |  |
Assets: |  |  |
Cash equivalents |  | 393 | 2,646
Restricted cash |  | 1,011 | 1
Liabilities: |  |  |
Acquisition-related contingent consideration |  | 0 | 0
Recurring basis | Level 1 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument |  |  |
Liabilities: |  |  |
Derivative Liabilities |  | 0 | 0
Recurring basis | Level 1 | Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Assets: |  |  |
Derivative Assets |  | 0 | 0
Liabilities: |  |  |
Derivative Liabilities |  | 0 | 0
Recurring basis | Level 2 |  |  |
Assets: |  |  |
Cash equivalents |  | 30 | 50
Restricted cash |  | 0 | 0
Liabilities: |  |  |
Acquisition-related contingent consideration |  | 0 | 0
Recurring basis | Level 2 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument |  |  |
Liabilities: |  |  |
Derivative Liabilities |  | 18 | 13
Recurring basis | Level 2 | Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Assets: |  |  |
Derivative Assets |  | 1 | 0
Liabilities: |  |  |
Derivative Liabilities |  | 2 | 0
Recurring basis | Level 3 |  |  |
Assets: |  |  |
Cash equivalents |  | 0 | 0
Restricted cash |  | 0 | 0
Liabilities: |  |  |
Acquisition-related contingent consideration |  | 312 | 316
Recurring basis | Level 3 | Cross-currency swaps | Net Investment Hedging | Designated as Hedging Instrument |  |  |
Liabilities: |  |  |
Derivative Liabilities |  | 0 | 0
Recurring basis | Level 3 | Foreign currency exchange contracts | Not Designated as Hedging Instrument |  |  |
Assets: |  |  |
Derivative Assets |  | 0 | 0
Liabilities: |  |  |
Derivative Liabilities |  | $ 0 | $ 0

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