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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) Hospital | Dec. 31, 2019 USD ($) Hospital | Dec. 31, 2018 USD ($) Hospital
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital | 1 | 7 | 2
Proceeds from sale of business | $ 68 | $ 61 | $ 808
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  |  | 75
Pretax gain (loss) after tax |  |  | 59
Proceeds from sale of business |  |  | 50
Discontinued Operations, Disposed of by Sale [Member] | Oklahoma [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  |  | 353
Pretax gain (loss) after tax |  |  | 265
Proceeds from sale of business |  |  | $ 758
Number of hospitals sold | Hospital |  |  | 2
Discontinued Operations, Disposed of by Sale [Member] | Louisiana [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax |  | 18 |
Pretax gain (loss) after tax |  | 13 |
Proceeds from sale of business |  | $ 61 |
Number of hospitals sold | Hospital |  | 1 |
Discontinued Operations, Disposed of by Sale [Member] | Mississippi [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax gain (loss) before tax | (7) |  |
Pretax gain (loss) after tax | (9) |  |
Proceeds from sale of business | $ 68 |  |
Number of hospitals sold | Hospital | 1 |  |
Hospitals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | $ 1,384 | $ 792
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | 298 | 461
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 279 | $ 332 | $ 636
Hospital and other nonhospital health care entities [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 568 |  |

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