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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 22, 2023 USD ($) | Mar. 31, 2024 USD ($) | Jan. 31, 2024 USD ($) designee shares | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($)
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Acquired in-process research and development expenses |  |  |  | $ 4,131 | $ 481 |
Arcus |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Ownership interest, shares (in shares) | shares |  |  | 30.1 |  |  |
Ownership percentage |  |  | 33.00% |  |  |
Arcus |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Additional interest acquired, shares (in shares) | shares |  |  | 15.2 |  |  |
Additional equity investment |  |  | $ 320 |  |  |
Option fee |  |  | $ 100 |  |  |
Number of designees | designee |  |  | 3 |  |  |
Arcus | Prepaid and other current assets |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Additional equity investment |  |  | $ 233 |  |  |
Arcus | Other (Income) Expense |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Additional equity investment |  |  | $ 87 |  |  |
CymaBay |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Total consideration transferred |  | $ 3,900 |  |  |  |
Acquired in-process research and development expenses |  |  |  | 3,900 |  |
Asset acquisition, assets acquired |  | 263 |  | 263 |  |
Asset acquisition, liabilities assumed |  | $ 228 |  | 228 |  |
Share-based compensation expense |  |  |  | 133 |  |
CymaBay | Research and development expenses |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Share-based compensation expense |  |  |  | 67 |  |
CymaBay | Selling, general and administrative expenses |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 67 |  |
Tmunity Therapeutics |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Acquired in-process research and development expenses |  |  |  |  | 244 |
Cash consideration | $ 300 |  |  |  |  |
Tmunity Therapeutics | Tmunity And University Of Pennsylvania |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Acquired in-process research and development expenses |  |  |  |  |  | $ 25
Maximum potential future milestone payments |  |  |  |  | $ 1,000 |

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