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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Revenues $ 12,694 $ 11,451 $ 37,813 $ 34,403
Equity in earnings of affiliates (4) (9) (23) (25)
Adjusted segment EBITDA 2,285 2,096 7,119 6,441
Depreciation and amortization 647 582 1,902 1,697
Interest expense 448 442 1,386 1,309
Gains on sales of facilities   (6) (17) (420)
Losses on retirement of debt 211 9 211 9
Income before income taxes 979 1,069 3,637 3,846
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 6,398 5,542 19,159 16,719
Equity in earnings of affiliates 2 (1) (3) (5)
Adjusted segment EBITDA 1,270 1,127 4,088 3,593
Depreciation and amortization 291 245 839 702
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,780 5,396 17,001 16,113
Equity in earnings of affiliates (10) (10) (32) (29)
Adjusted segment EBITDA 1,185 1,072 3,443 3,250
Depreciation and amortization 277 258 828 765
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 516 513 1,653 1,571
Equity in earnings of affiliates 4 2 12 9
Adjusted segment EBITDA (170) (103) (412) (402)
Depreciation and amortization $ 79 $ 79 $ 235 $ 230