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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 (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 17,487 $ 16,213 $ 52,318 $ 47,665
Equity in (earnings) losses of affiliates (15) (19) (13) 6
Adjusted segment EBITDA 3,267 2,880 10,170 9,108
Depreciation and amortization 842 769 2,456 2,288
Interest expense 515 483 1,533 1,447
Losses (gains) on sales of facilities 4 (2) (209) 12
Income before income taxes 1,906 1,630 6,390 5,361
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,891 4,352 14,503 13,340
Equity in (earnings) losses of affiliates 0 0 2 (2)
Adjusted segment EBITDA 1,087 799 3,259 2,826
Depreciation and amortization 213 206 636 621
Atlantic Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,578 5,470 16,974 15,617
Equity in (earnings) losses of affiliates 0 0 (2) (2)
Adjusted segment EBITDA 1,154 1,158 3,757 3,219
Depreciation and amortization 271 249 790 735
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 6,019 5,491 17,911 16,226
Equity in (earnings) losses of affiliates (18) (13) (49) (35)
Adjusted segment EBITDA 1,378 1,210 4,118 3,662
Depreciation and amortization 277 244 799 719
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 999 900 2,930 2,482
Equity in (earnings) losses of affiliates 3 (6) 36 45
Adjusted segment EBITDA (352) (287) (964) (599)
Depreciation and amortization $ 81 $ 70 $ 231 $ 213