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BUSINESS ACQUISITIONS - Additional Information (Details) $ in Millions, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 04, 2025 USD ($) | Aug. 23, 2024 CAD ($) | Aug. 23, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Aug. 31, 2025
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash paid for business acquisitions |  |  |  | $ 34 | $ 1,583 | $ 51 | $ 1,831 |
Corewell Health |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Subsidiary, ownership percentage, parent |  |  |  |  |  |  |  | 51.00%
Laboratory Facility | Corewell Health |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 49.00%
LifeLabs Inc. |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash paid for business acquisitions |  | $ 1,350 | $ 1,000 |  |  |  |  |
Deferred tax asset, increase |  |  |  |  |  | 9 |  |
Goodwill, decrease |  |  |  |  |  | $ 9 |  |
Spectra Laboratories |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash paid for business acquisitions | $ 34 |  |  |  |  |  |  |
Goodwill, expected tax deductible amount | 25 |  |  |  |  |  |  |
Spectra Laboratories | Customer Relationships |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 9 |  |  |  |  |  |  |
Intangible assets, useful life | 15 years |  |  |  |  |  |  |

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