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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Hospital | Dec. 31, 2018 USD ($) Hospital | Dec. 31, 2017 USD ($) Hospital
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | Hospital | 7 | 2 | 8
Proceeds from sale of business | $ 61 | $ 808 | $ 25
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sales of real estate | 36 | 50 | 8
Pretax gain (loss) after tax | 19 | 75 | 5
Proceeds from sale of business | 14 | 59 | 25
Discontinued Operations, Disposed of by Sale [Member] | Oklahoma [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sales of real estate | 1 | 353 |
Pretax gain (loss) after tax | 1 | 265 |
Proceeds from sale of business | $ 25 | $ 758 |
Number of hospitals sold | Hospital | 1 | 2 |
Hospitals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | $ 1,384 | $ 792 | 1,000
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price | 298 | 461 | 212
Other [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 332 | $ 636 | $ 693

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