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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 14,435 $ 11,068 $ 28,412 $ 23,929
Equity in earnings of affiliates (22) (1) (43) (8)
Adjusted segment EBITDA 3,219 2,666 6,271 4,866
Depreciation and amortization 712 691 1,409 1,365
Interest expense 386 388 770 816
Losses (gains) on sales of facilities (8) 27 (10) 20
Losses on retirement of debt 12 0 12 295
Income before income taxes 2,117 1,560 4,090 2,370
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 7,300 5,546 14,356 12,020
Equity in earnings of affiliates (9) (4) (16) (3)
Adjusted segment EBITDA 1,845 1,485 3,550 2,700
Depreciation and amortization 339 312 662 618
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 6,504 5,103 12,795 10,847
Equity in earnings of affiliates (12) (2) (24) (11)
Adjusted segment EBITDA 1,593 1,408 3,094 2,523
Depreciation and amortization 296 295 589 582
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 631 419 1,261 1,062
Equity in earnings of affiliates (1) 5 (3) 6
Adjusted segment EBITDA (219) (227) (373) (357)
Depreciation and amortization $ 77 $ 84 $ 158 $ 165