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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) Hospital | Dec. 31, 2023 USD ($) Hospital | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | $ (5) |
Proceeds from sale of business | $ 328 | 193 | $ 1,237
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | (5) |  | 274
Gain (loss) after tax | $ (4) |  | $ 200
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 | $ 33 | 31 | $ 326
Discontinued Operations, Disposed of by Sale [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  |  | 1,027
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 | $ 112 | $ 229 |
Number of hospitals purchased | Hospital | 3 | 4 |
Proceeds from sale of business | $ 295 | $ 162 |
Number of hospitals sold | Hospital | 1 | 2 |
Hospital Facility One [Member] | Discontinued Operations, Disposed of by Sale [Member] | CALIFORNIA |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | $ 189 |  |
Gain (loss) after tax | $ 145 |  |
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 |  |
Hospital Facility Two [Member] | Discontinued Operations, Disposed of by Sale [Member] | CALIFORNIA |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | $ (170) |  |
Gain (loss) after tax | $ (130) |  |
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 |  |
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 154 | $ 406 | 224
Fair value of the noncontrolling interest in the acquiree at the acquisition date |  |  | 72
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 170 | $ 362 | $ 262

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