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Accounting Policies - Schedule of Revenues from Third Party Payers, Uninsured and Other Payers (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues From Third Party Payers [Line Items] |  |  |
Revenues | $ 70,603 | $ 64,968 | $ 60,233
Revenues ratio from third party payers | 100.00% | 100.00% | 100.00%
Medicare [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 10,780 | $ 10,585 | $ 10,447
Revenues from third party payers, Ratio | 15.30% | 16.30% | 17.30%
Managed Medicare [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 11,987 | $ 10,496 | $ 9,201
Revenues from third party payers, Ratio | 17.00% | 16.20% | 15.30%
Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 4,678 | $ 3,606 | $ 2,636
Revenues from third party payers, Ratio | 6.60% | 5.60% | 4.40%
Managed Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 3,980 | $ 3,879 | $ 3,998
Revenues from third party payers, Ratio | 5.60% | 6.00% | 6.60%
Managed Care and Other Insurers [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 34,954 | $ 31,819 | $ 29,120
Revenues from third party payers, Ratio | 49.50% | 49.00% | 48.30%
International (Managed Care and Other Insurers) [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 1,682 | $ 1,509 | $ 1,317
Revenues from third party payers, Ratio | 2.40% | 2.30% | 2.20%
Other [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues | $ 2,542 | $ 3,074 | $ 3,514
Other, Ratio | 3.60% | 4.60% | 5.90%

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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