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Acquisitions and Dispositions - Additional Information (Detail) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) Hospital | Mar. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |
Proceeds from sale of business | $ 767 | $ 4
Real Estate and Other Investments [Member] |  |
Business Acquisition [Line Items] |  |
Pretax gain (loss) on sales of business | 29 | 1
Proceeds from sale of business | 9 | 4
Discontinued Operations, Disposed of by Sale [Member] | Oklahoma [Member] |  |
Business Acquisition [Line Items] |  |
Pretax gain (loss) on sales of business | 376 |
Proceeds from sale of business | $ 758 |
Number of hospitals sold | Hospital | 2 |
Hospitals [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 360 |
Nonhospital Health Care [Member] |  |
Business Acquisition [Line Items] |  |
Aggregate purchase price | $ 19 | $ 90

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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