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v3.25.1

Segment and Geographic Information - Schedule of Geographic Distributions of Revenues, Equity in Earnings or Losses of Affiliates, Adjusted Segment EBITDA, Depreciation and Amortization (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 18,321 | $ 17,339 |
Salaries and benefits | 7,997 | 7,707 |
Supplies | 2,764 | 2,671 |
Other operating expenses | 3,845 | 3,606 |
Equity in earnings of affiliates | (18) | 2 |
Depreciation and amortization | 860 | 795 |
Interest expense | 547 | 512 |
Gains on sales of facilities | (1) | (201) |
Income before income taxes | 2,327 | 2,247 |
Assets | 59,798 |  | $ 59,513
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted segment EBITDA | 4,012 | 3,624 |
Eliminations and Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Corporate and Other | 279 | 271 |
Depreciation and amortization | 860 | 795 |
Interest expense | 547 | 512 |
Gains on sales of facilities | (1) | (201) |
Income before income taxes | 2,327 | 2,247 |
National Group [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 5,065 | 4,835 | 4,835
Salaries and benefits | 1,959 |  | 1,890
Supplies | 741 |  | 705
Other operating expenses | 1,233 |  | 1,194
Equity in earnings of affiliates |  |  | (1)
Operating expenses | 3,933 |  | 3,788
Adjusted segment EBITDA | 1,132 | 1,047 | 1,047
Depreciation and amortization | 226 | 212 |
Assets | 13,407 |  | 12,855
Atlantic Group [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,167 | 5,810 | 5,810
Salaries and benefits | 2,216 |  | 2,161
Supplies | 914 |  | 909
Other operating expenses | 1,576 |  | 1,482
Equity in earnings of affiliates | (1) |  | (1)
Operating expenses | 4,705 |  | 4,551
Adjusted segment EBITDA | 1,462 | 1,259 | 1,259
Depreciation and amortization | 274 | 258 |
Assets | 17,654 |  | 17,168
American Group [Member] | Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 6,331 | 5,984 | 5,984
Salaries and benefits | 2,196 |  | 2,119
Supplies | 1,020 |  | 980
Other operating expenses | 1,711 |  | 1,580
Equity in earnings of affiliates | (14) |  | (13)
Operating expenses | 4,913 |  | 4,666
Adjusted segment EBITDA | 1,418 | 1,318 | 1,318
Depreciation and amortization | 279 | 255 |
Assets | 20,614 |  | 20,714
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 758 | 710 |
Depreciation and amortization | 81 | $ 70 |
Assets | $ 8,123 |  | $ 8,776

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