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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Revenues $ 12,602 $ 11,529 $ 25,119 $ 22,952
Equity in earnings of affiliates (8) (7) (19) (16)
Adjusted segment EBITDA 2,293 2,227 4,834 4,345
Depreciation and amortization 636 562 1,255 1,115
Interest expense 477 436 938 867
Gains on sales of facilities (18) (9) (17) (414)
Income before income taxes 1,198 1,238 2,658 2,777
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 6,444 5,609 12,761 11,177
Equity in earnings of affiliates (3) (2) (5) (4)
Adjusted segment EBITDA 1,364 1,284 2,818 2,466
Depreciation and amortization 283 232 548 457
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,626 5,390 11,221 10,717
Equity in earnings of affiliates (11) (10) (22) (19)
Adjusted segment EBITDA 1,117 1,147 2,258 2,178
Depreciation and amortization 270 255 551 507
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 532 530 1,137 1,058
Equity in earnings of affiliates 6 5 8 7
Adjusted segment EBITDA (188) (204) (242) (299)
Depreciation and amortization $ 83 $ 75 $ 156 $ 151