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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) Hospital | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) Hospital
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | $ (5) |  |
Proceeds from sale of business | 193 | $ 1,237 | $ 2,160
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | 274 | 394
Pretax gain (loss) after tax |  | $ 200 | $ 294
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Proceeds from sale of business | 31 | $ 326 | $ 658
Discontinued Operations, Disposed of by Sale [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | 1,027 |
Pretax gain (loss) after tax |  | $ 527 |
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |
Proceeds from sale of business |  | $ 911 |
Hospital Facility [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 229 |  | $ 67
Number of hospitals purchased | Hospital | 4 |  | 2
Proceeds from sale of business | $ 162 |  |
Number of hospitals sold | Hospital | 2 |  |
Hospital Facility [Member] | Southern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital |  |  | 1
Hospital Facility [Member] | TENNESSEE |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital |  |  | 1
Hospital Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | Southern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital |  |  | 2
Hospital Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | GEORGIA |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  |  | $ 1,226
Pretax gain (loss) after tax |  |  | $ 920
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Proceeds from sale of business |  |  | $ 1,502
Number of hospitals sold | Hospital |  |  | 5
Hospital Facility [Member] | Discontinued Operations, Disposed of by Sale [Member] | Northern Georgia [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals sold | Hospital |  |  | 3
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 406 | 224 | $ 114
Fair value of the noncontrolling interest in the acquiree at the acquisition date |  | 72 | 117
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 362 | $ 262 | 1,002
Urgent Care Centers [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  |  | 594
Home Health and Hospice [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of the noncontrolling interest in the acquiree at the acquisition date |  |  | 100
Payment to acquire venture providing post acute care services |  |  | $ 330
Business acquisition percentage of voting interests acquired |  |  | 80.00%

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