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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Revenues $ 11,068 $ 12,602 $ 23,929 $ 25,119
Equity in earnings of affiliates (1) (8) (8) (19)
Adjusted segment EBITDA 2,666 2,293 4,866 4,834
Depreciation and amortization 691 636 1,365 1,255
Interest expense 388 477 816 938
Losses (gains) on sales of facilities 27 (18) 20 (17)
Losses on retirement of debt 0 0 295 0
Income before income taxes 1,560 1,198 2,370 2,658
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,546 6,444 12,020 12,761
Equity in earnings of affiliates (4) (3) (3) (5)
Adjusted segment EBITDA 1,485 1,364 2,700 2,818
Depreciation and amortization 312 283 618 548
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,103 5,626 10,847 11,221
Equity in earnings of affiliates (2) (11) (11) (22)
Adjusted segment EBITDA 1,408 1,117 2,523 2,258
Depreciation and amortization 295 270 582 551
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 419 532 1,062 1,137
Equity in earnings of affiliates 5 6 6 8
Adjusted segment EBITDA (227) (188) (357) (242)
Depreciation and amortization $ 84 $ 83 $ 165 $ 156