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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 11,529	$ 10,733	$ 22,952	$ 21,356
Equity in earnings of affiliates	7	13	16	23
Adjusted segment EBITDA	2,227	2,090	4,345	4,095
Depreciation and amortization	562	521	1,115	1,042
Interest expense	436	411	867	830
Gains on sales of facilities	(9)	(2)	(414)	(3)
Income before income taxes	1,238	1,160	2,777	2,226
National Group [Member]
Segment Reporting Information [Line Items]
Revenues	5,609	5,160	11,177	10,308
Equity in earnings of affiliates	(2)	(4)	(4)	(9)
Adjusted segment EBITDA	1,284	1,162	2,466	2,293
Depreciation and amortization	232	217	457	431
American Group [Member]
Segment Reporting Information [Line Items]
Revenues	5,390	5,093	10,717	10,088
Equity in earnings of affiliates	(10)	(10)	(19)	(18)
Adjusted segment EBITDA	1,147	1,040	2,178	2,047
Depreciation and amortization	255	238	507	476
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	530	480	1,058	960
Equity in earnings of affiliates	5	1	7	4
Adjusted segment EBITDA	(204)	(112)	(299)	(245)
Depreciation and amortization	$ 75	$ 66	$ 151	$ 135

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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.

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