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FAIR VALUE MEASUREMENTS - Summary of Classification of Equity Securities (Details) - Equity Securities - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total | $ 4,774 | $ 6,970
Cash and cash equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | 2,768 | 4,361
Prepaid and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | 871 | 853
Other long-term assets |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Marketable equity securities | $ 1,135 | $ 1,756

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