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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) Hospital | Mar. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital | 7 |
Proceeds from sale of business | $ 30 | $ 767
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 5 | 9
Pretax gain (loss) on sales of business |  | 29
Real Estate and Other Investments [Member] | Louisiana Markets [Member] |  |
Business Acquisition [Line Items] |  |
Pretax gain (loss) on sales of business | 1 |
Discontinued Operations, Disposed of by Sale [Member] | Louisiana Markets [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 25 |
Discontinued Operations, Disposed of by Sale [Member] | Oklahoma [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business |  | 758
Pretax gain (loss) on sales of business |  | 376
Hospitals [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 1,398 | 360
Non hospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 76 | $ 19
Other [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | $ 207 |

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