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BUSINESS ACQUISITIONS (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2020 | Jul. 31, 2020 | Apr. 06, 2020 | Jan. 21, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  | $ 18,000,000 | $ 0 | $ 21,000,000 | $ 0 |  |
Goodwill |  |  |  |  | $ 6,880,000,000 |  | $ 6,880,000,000 |  | $ 6,619,000,000 | $ 6,563,000,000
Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life |  |  |  |  |  |  | 17 years |  |  |
Blueprint Genetics Oy |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisitions |  |  |  | $ 108,000,000 |  |  |  |  |  |
Cash acquired from acquisition |  |  |  | 3,000,000 |  |  |  |  |  |
Goodwill |  |  |  | 77,000,000 |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  | 0 |  |  |  |  |  |
Intangible assets |  |  |  | 43,000,000 |  |  |  |  |  |
Deferred tax liabilities |  |  |  | 11,000,000 |  |  |  |  |  |
Property, plant and equipment and working capital |  |  |  | $ 2,000,000 |  |  |  |  |  |
Blueprint Genetics Oy | Technology |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life |  |  |  | 10 years |  |  |  |  |  |
Blueprint Genetics Oy | Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life |  |  |  | 15 years |  |  |  |  |  |
Laboratory Services Business, Memorial Hermann |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisitions |  |  | $ 120,000,000 |  |  |  |  |  |  |
Goodwill |  |  | 93,000,000 |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  | 93,000,000 |  |  |  |  |  |  |
Laboratory Services Business, Memorial Hermann | Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  | $ 27,000,000 |  |  |  |  |  |  |
Intangible assets, useful life |  |  | 15 years |  |  |  |  |  |  |
MACL |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Cash paid for business acquisitions | $ 93,000,000 |  |  |  |  |  |  |  |  |
Cash acquired from acquisition | 18,000,000 |  |  |  |  |  |  |  |  |
Goodwill | 84,000,000 |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount | 47,000,000 |  |  |  |  |  |  |  |  |
Intangible assets | $ 74,000,000 |  |  |  |  |  |  |  |  |
Percentage of interests acquired | 56.00% |  |  |  |  |  |  |  |  |
Equity interest in acquiree, percentage |  | 44.00% |  |  |  |  |  |  |  |
Equity interest in acquiree, fair value |  | $ 87,000,000 |  |  |  |  |  |  |  |
Long-term growth rate used to determine fair value | 1.50% |  |  |  |  |  |  |  |  |
Dicount rate used to determine fair value | 7.50% |  |  |  |  |  |  |  |  |
Working capital | $ 11,000,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 11,000,000 |  |  |  |  |  |  |  |  |
MACL | Other Income, Net |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, remeasurement gain | $ 70,000,000 |  |  |  |  |  |  |  |  |
MACL | Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets, useful life | 15 years |  |  |  |  |  |  |  |  |

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