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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounting Policies [Abstract] |  |  |  |
Advertising cost |  | $ 31,000,000 | $ 74,000,000 | $ 78,000,000
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Equity method investments carrying value | $ 135,000,000 | $ 135,000,000 | $ 132,000,000 |
Percentage of net revenues |  | 100.00% | 100.00% | 100.00%
Share of equity earnings from investments in affiliates |  | $ 26,000,000 | $ 44,000,000 | $ 78,000,000
Percentage of net accounts receivable | 100.00% | 100.00% | 100.00% |
Goodwill, impairment loss |  | $ 0 | $ 0 |
Operating income (loss) |  | 1,262,000,000 | 1,428,000,000 | 2,381,000,000
Net income |  | 908,000,000 | 1,015,000,000 | 2,080,000,000
Trading equity securities gain or (loss) |  | 20,000,000 | (55,000,000) | 56,000,000
Impairment charges |  | 0 | 0 | $ 0
Equity Securities without readily determinable fair value | $ 18,000,000 | 18,000,000 | 4,000,000 |
Available-for-sale debt securities | 2,000,000 | 2,000,000 | 2,000,000 |
Recurring Basis |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Available-for-sale debt securities | 2,000,000 | $ 2,000,000 | $ 2,000,000 |
Facility-Related Costs |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Impairment charges | $ 29,000,000 |  |  |
DIS business |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 97.00% | 97.00% | 97.00%
Percentage of net accounts receivable | 96.00% | 96.00% | 96.00% |
Operating income (loss) |  | $ 1,547,000,000 | $ 1,704,000,000 | $ 2,646,000,000
DIS business | Government payers |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 11.00% | 11.00% | 10.00%
Percentage of net accounts receivable | 7.00% | 7.00% | 6.00% |
DIS business | Patients (including coinsurance and deductible responsibilities) |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 12.00% | 12.00% | 12.00%
Percentage of net accounts receivable | 20.00% | 20.00% | 18.00% |
Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 5 years | 5 years |  |
Minimum | Laboratory Equipment and Furniture and Fixtures |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years | 5 years |  |
Minimum | Software and Software Development Costs |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 5 years | 5 years |  |
Minimum | DIS business |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of net revenues |  | 95.00% | 95.00% | 95.00%
Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 20 years | 20 years |  |
Maximum | Building and Building Improvements |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 31 years 6 months | 31 years 6 months |  |
Maximum | Laboratory Equipment and Furniture and Fixtures |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 12 years | 12 years |  |
Maximum | Software and Software Development Costs |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life | 10 years | 10 years |  |
Substantial Ownership Interest | Minimum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 20.00% | 20.00% |  |
Substantial Ownership Interest | Maximum |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage | 49.00% | 49.00% |  |

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