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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) Hospital | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |
Number of hospitals purchased | Hospital | 7 |
Proceeds from sale of business | $ 41 | $ 799
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Proceeds from sale of business | 16 | 41
Pretax gain (loss) on sales of business | 18 | 42
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 |  | 372
Hospitals [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 1,397 | 360
Non hospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | 107 | $ 178
Other [Member] |  |
Business Acquisition [Line Items] |  |
Goodwill | $ 201 |

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