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Segment and Geographic Information - Schedule of Geographic Distributions of Revenues, Equity in Earnings of Affiliates, Adjusted Segment EBITDA, Depreciation and Amortization and Assets (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 10,733 | $ 10,319 | $ 21,356 | $ 20,579
Equity in earnings of affiliates | 13 | 10 | 23 | 22
Adjusted segment EBITDA | 2,090 | 2,052 | 4,095 | 4,055
Depreciation and amortization | 521 | 489 | 1,042 | 968
Interest expense | 411 | 427 | 830 | 843
Gains on sales of facilities | (2) | (6) | (3) | (5)
Legal claim costs |  | 10 |  | 22
Income before income taxes | 1,160 | 1,132 | 2,226 | 2,227
National Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,160 | 4,931 | 10,308 | 9,898
Equity in earnings of affiliates | (4) | (2) | (9) | (4)
Adjusted segment EBITDA | 1,162 | 1,131 | 2,293 | 2,269
Depreciation and amortization | 217 | 201 | 431 | 398
American Group [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 5,093 | 4,860 | 10,088 | 9,646
Equity in earnings of affiliates | (10) | (8) | (18) | (17)
Adjusted segment EBITDA | 1,040 | 1,004 | 2,047 | 1,986
Depreciation and amortization | 238 | 225 | 476 | 444
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 480 | 528 | 960 | 1,035
Equity in earnings of affiliates | 1 |  | 4 | (1)
Adjusted segment EBITDA | (112) | (83) | (245) | (200)
Depreciation and amortization | $ 66 | $ 63 | $ 135 | $ 126

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- Definition Income before depreciation and amortization, interest expense, losses (gains) on sales of facilities, losses on retirement of debt, legal claim costs, income taxes and net income attributable to non controlling interests. + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of patient service revenue, net of contractual allowances and discounts, less the related provision for bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68054470&loc=SL9156442-115640 + Details
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