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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Revenues | $ 11,423 | $ 10,623
Equity in earnings of affiliates | 9 | 10
Adjusted segment EBITDA | 2,118 | 2,005
Depreciation and amortization | 553 | 521
Interest expense | 431 | 419
Gains on sales of facilities | (405) | (1)
Income before income taxes | 1,539 | 1,066
National Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 5,568 | 5,148
Equity in earnings of affiliates | (2) | (5)
Adjusted segment EBITDA | 1,182 | 1,131
Depreciation and amortization | 225 | 214
American Group [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 5,327 | 4,995
Equity in earnings of affiliates | (9) | (8)
Adjusted segment EBITDA | 1,031 | 1,007
Depreciation and amortization | 252 | 238
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Revenues | 528 | 480
Equity in earnings of affiliates | 2 | 3
Adjusted segment EBITDA | (95) | (133)
Depreciation and amortization | $ 76 | $ 69

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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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