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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, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Revenues $ 12,517 $ 11,423
Equity in earnings of affiliates (11) (9)
Adjusted segment EBITDA 2,541 2,118
Depreciation and amortization 619 553
Interest expense 461 431
Gains on sales of facilities 1 (405)
Income before income taxes 1,460 1,539
National Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 6,317 5,568
Equity in earnings of affiliates (2) (2)
Adjusted segment EBITDA 1,454 1,182
Depreciation and amortization 265 225
American Group [Member]    
Segment Reporting Information [Line Items]    
Revenues 5,595 5,327
Equity in earnings of affiliates (11) (9)
Adjusted segment EBITDA 1,141 1,031
Depreciation and amortization 281 252
Corporate and Other [Member]    
Segment Reporting Information [Line Items]    
Revenues 605 528
Equity in earnings of affiliates 2 2
Adjusted segment EBITDA (54) (95)
Depreciation and amortization $ 73 $ 76