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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 16,213 $ 14,971 $ 47,665 $ 44,736
Equity in (earnings) losses of affiliates (19) (10) 6 (29)
Adjusted segment EBITDA 2,880 2,902 9,108 8,888
Depreciation and amortization 769 749 2,288 2,219
Interest expense 483 446 1,447 1,288
Losses (gains) on sales of facilities (2) 3 12 25
Losses on retirement of debt 0 0 0 78
Income before income taxes 1,630 1,704 5,361 5,278
National Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,352 4,092 13,340 12,382
Equity in (earnings) losses of affiliates 0 0 (2) (1)
Adjusted segment EBITDA 799 780 2,826 2,602
Depreciation and amortization 206 207 621 598
Atlantic Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,470 4,951 15,617 14,337
Equity in (earnings) losses of affiliates 0 (1) (2) (2)
Adjusted segment EBITDA 1,158 1,014 3,219 2,833
Depreciation and amortization 249 231 735 686
American Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 5,491 5,117 16,226 15,528
Equity in (earnings) losses of affiliates (13) (13) (35) (31)
Adjusted segment EBITDA 1,210 1,178 3,662 3,832
Depreciation and amortization 244 236 719 701
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
Revenues 900 811 2,482 2,489
Equity in (earnings) losses of affiliates (6) 4 45 5
Adjusted segment EBITDA (287) (70) (599) (379)
Depreciation and amortization $ 70 $ 75 $ 213 $ 234