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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate reconciliation (as a percent) |  | 16.20% | (31.10%) |  | 18.00% | 11.80%
In-process research and development impairments |  | $ 0 | $ 1,750 |  | $ 190 | $ 4,180
Acquired in-process research and development expenses |  | 170 | 505 |  | 485 | 4,674
Income tax benefit |  | $ (589) | 297 |  | $ (1,391) | 174
Forecast | Subsequent Event |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax benefit | $ 450 |  |  |  |  |
Decrease in unrecognized tax benefits | $ 530 |  |  |  |  |
CymaBay |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Acquired in-process research and development expenses |  |  |  | $ 3,900 |  |
In Process Research And Development NSCLC |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
In-process research and development impairments |  |  | $ 1,800 | $ 2,400 |  | $ 4,200

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