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v3.25.1

Basis of Presentation and Significant Accounting Policies - Schedule of Revenues from Third Party Payers, Uninsured and Other Payers (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Revenues From Third Party Payers [Line Items] |  |  |
Revenues | $ 18,321 | $ 17,339 |
Revenues ratio from third party payers | 100.00% | 100.00% |
Medicare [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 2,895 | $ 2,838 |
Revenues from third party payers, Ratio | 15.80% | 16.40% |
Managed Medicare [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 3,299 | $ 3,026 |
Revenues from third party payers, Ratio | 4.80% | 17.40% |
Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 1,190 | $ 1,000 |
Revenues from third party payers, Ratio | 6.50% | 5.80% |
Managed Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 879 | $ 978 |
Revenues from third party payers, Ratio | 18.00% | 5.60% |
Managed Care and Insurers [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 9,041 | $ 8,545 |
Revenues from third party payers, Ratio |  | 49.20% | 49.40%
International (Managed Care and Insurers) [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 445 | $ 412 |
Revenues from third party payers, Ratio | 2.40% | 2.40% |
Other [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues | $ 572 | $ 540 |
Other, Ratio | 3.10% | 3.20% |

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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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