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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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Number of hospitals sold.

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721525-107759

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

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-Publisher FASB
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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
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