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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Net loss from equity securities | $ 142 | $ 964 | $ 667 | $ 1,046 |  |
Equity investments not measured at fair value | 96 |  | 96 |  |  | $ 58
Equity investments without readily determinable fair values | 211 |  | 211 |  |  | 204
Level 2 | MYR GmbH | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 0 |  | 0 |  |  | 0
Level 3 | MYR GmbH | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 328 |  | 328 |  | $ 341 | 0
Market value | MYR GmbH | Fair Value, Measurements, Recurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 328 |  | 328 |  |  | 0
Market value | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Short-term and long-term debt | 29,600 |  | 29,600 |  |  | 34,600
Carrying value | Level 2 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Short-term and long-term debt, carrying values | $ 26,600 |  | 26,600 |  |  | $ 30,300
Equity Securities Donation | Gilead Foundation |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |
Donation expense |  |  | $ 212 |  |  |

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