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BUSINESS ACQUISITIONS (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2020 | Jul. 31, 2020 | Apr. 06, 2020 | Jan. 21, 2020 | Feb. 11, 2019 | Nov. 06, 2018 | Sep. 19, 2018 | Jun. 18, 2018 | Feb. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 330,000,000 | $ 63,000,000 | $ 440,000,000
Goodwill acquired during the year |  |  |  |  |  |  |  |  |  |  |  |  | 247,000,000 | 43,000,000 |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  |  |  |  |  | 210,000,000 | 36,000,000 | 205,000,000
Finite-lived intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 146,000,000 | 21,000,000 | 167,000,000
Revenues |  |  |  |  |  |  |  |  |  |  |  |  | 127,000,000 |  | 84,000,000
Cash acquired from acquisition |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 | 0 | 6,000,000
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | 6,873,000,000 | 6,619,000,000 | 6,563,000,000
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | 351,000,000 | 58,000,000 | 427,000,000
Contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Goodwill adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 241,000,000
Other Operating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements |  |  |  |  |  |  |  |  |  |  |  | $ (6,000,000) |  |  |
Technology-Based Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  | 17 years |  |
Blueprint Genetics Oy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  | $ 108,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  | 66,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 66,000,000 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  | 43,000,000 |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment and working capital |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Blueprint Genetics Oy | Technology-Based Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Blueprint Genetics Oy | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Memorial Hermann |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  | $ 120,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  | 93,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 93,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Memorial Hermann | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  | $ 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Mid America Clinical Laboratories, LLC (MACL) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ 93,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes | 47,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash acquired from acquisition | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 84,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles | $ 74,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 56.00% |  |  |  |  |  |  |  |  |  | 56.00% |  |  |  |
Equity interest in acquiree, percentage |  | 44.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, fair value |  | $ 87,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, remeasurement gain |  |  |  |  |  |  |  |  |  |  | $ 70,000,000 |  |  |  |
Equity interest in acquiree, long-term growth rate used to determine fair value | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, discount rate used to determine fair value | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid America Clinical Laboratories, LLC (MACL) | Other Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, remeasurement gain | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid America Clinical Laboratories, LLC (MACL) | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Boyce & Bynum Pathology Laboratories, P.C. (Boyce & Bynum) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  | $ 61,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  | 35,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 41,000,000 |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  |
Boyce & Bynum Pathology Laboratories, P.C. (Boyce & Bynum) | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  | 0 |
Boyce & Bynum Pathology Laboratories, P.C. (Boyce & Bynum) | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |
Boyce & Bynum Pathology Laboratories, P.C. (Boyce & Bynum) | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  | $ 142,000,000 |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 57,000,000 |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  |  |  |  |  | 77,000,000 |  |  |  |  |  |
Working capital |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  | 130,000,000 |  |  |  |  |  |
Mobile Medical Examination Services, Inc. (MedXM) | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | $ 12,000,000 |  |  |  |  |  | 0
Mobile Medical Examination Services, Inc. (MedXM) | Other Operating Income (Expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000
Mobile Medical Examination Services, Inc. (MedXM) | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Cape Cod Healthcare, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |
ReproSource, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | 30,000,000 |  |  |  |  |  |  |  |
ReproSource, Inc. | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  | $ 0 |
Oxford Immunotec, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 170,000,000 |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  |  |  |  |  | 112,000,000 |  |  |  |  |  |  |  |  |
Cash acquired from acquisition |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | 112,000,000 |  |  |  |  |  |  |  |  |
Finite-lived intangibles |  |  |  |  |  | 43,000,000 |  |  |  |  |  |  |  |  |
Working capital |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
Adjustment, goodwill |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  |  |  |  |
Adjustment, intangibles |  |  |  |  |  |  |  |  |  | (11,000,000) |  |  |  |  |
Adjustment, other assets and liabilities |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |
Oxford Immunotec, Inc. | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Oxford Immunotec, Inc. | Contract Related |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment and Working Capital + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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