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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased |  | 3 | 3
Proceeds from sale of business |  | $ 14 | $ 14
Real Estate and Other Investments [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from sale of business |  | 14 | 14
Pretax gain (loss) on sales of business |  | 3 | 5
Hospitals [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | 189 | 343
Nonhospital Health Care [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price |  | $ 106 | $ 87
Subsequent Event [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of hospitals purchased | 2 |  |

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