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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, Assets and Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 64,968 | $ 60,233 | $ 58,752
Equity in losses (earnings) of affiliates | (22) | (45) | (113)
Adjusted segment EBITDA | 12,726 | 12,067 | 12,644
Depreciation and amortization | 3,077 | 2,969 | 2,853
Interest expense | 1,938 | 1,741 | 1,566
Losses (gains) on sales of facilities | 5 | (1,301) | (1,620)
Losses on retirement of debt | 0 | 78 | 12
Income before income taxes | 7,706 | 8,580 | 9,833
Assets | 56,211 | 52,438 | 50,742
Goodwill and other intangible assets, Beginning Balance | 9,653 | 9,540 | 8,578
Goodwill and other intangible assets, Acquisitions | 362 | 262 | 1,062
Foreign Currency Translation Amortization And Other | (70) | (149) | (100)
Goodwill and other intangible assets, Ending Balance | 9,945 | 9,653 | 9,540
National Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 18,105 | 16,767 | 16,329
Equity in losses (earnings) of affiliates | (2) | (1) | (33)
Adjusted segment EBITDA | 4,000 | 3,616 | 4,202
Depreciation and amortization | 834 | 801 | 754
Assets | 12,487 | 11,793 | 11,236
Goodwill and other intangible assets, Beginning Balance | 1,244 | 1,212 | 1,089
Goodwill and other intangible assets, Acquisitions | 0 | 75 | 126
Foreign Currency Translation Amortization And Other | (3) | (43) | (3)
Goodwill and other intangible assets, Ending Balance | 1,241 | 1,244 | 1,212
Atlantic Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 21,167 | 19,324 | 19,098
Equity in losses (earnings) of affiliates | (3) | (3) | (2)
Adjusted segment EBITDA | 4,492 | 3,881 | 4,218
Depreciation and amortization | 989 | 921 | 848
Assets | 16,098 | 15,092 | 13,944
Goodwill and other intangible assets, Beginning Balance | 2,057 | 1,970 | 1,375
Goodwill and other intangible assets, Acquisitions | 8 | 90 | 610
Foreign Currency Translation Amortization And Other | (1) | (3) | (15)
Goodwill and other intangible assets, Ending Balance | 2,064 | 2,057 | 1,970
American Group [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 22,318 | 20,858 | 19,636
Equity in losses (earnings) of affiliates | (59) | (43) | (50)
Adjusted segment EBITDA | 5,208 | 5,102 | 4,836
Depreciation and amortization | 971 | 937 | 897
Assets | 19,786 | 17,934 | 17,224
Goodwill and other intangible assets, Beginning Balance | 5,152 | 5,062 | 4,996
Goodwill and other intangible assets, Acquisitions | 326 | 90 | 66
Foreign Currency Translation Amortization And Other | 0 | 0 | 0
Goodwill and other intangible assets, Ending Balance | 5,478 | 5,152 | 5,062
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 3,378 | 3,284 | 3,689
Equity in losses (earnings) of affiliates | 42 | 2 | (28)
Adjusted segment EBITDA | (974) | (532) | (612)
Depreciation and amortization | 283 | 310 | 354
Assets | 7,840 | 7,619 | 8,338
Goodwill and other intangible assets, Beginning Balance | 1,200 | 1,296 | 1,118
Goodwill and other intangible assets, Acquisitions | 28 | 7 | 260
Foreign Currency Translation Amortization And Other | (66) | (103) | (82)
Goodwill and other intangible assets, Ending Balance | $ 1,162 | $ 1,200 | $ 1,296

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