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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, 2024 | Mar. 31, 2023
Revenues From Third Party Payers [Line Items] |  |
Revenues | $ 17,339 | $ 15,591
Revenues ratio from third party payers | 100.00% | 100.00%
Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 2,838 | $ 2,738
Revenues from third party payers, Ratio | 16.40% | 17.60%
Managed Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 3,026 | $ 2,559
Revenues from third party payers, Ratio | 17.40% | 16.40%
Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 1,000 | $ 735
Revenues from third party payers, Ratio | 5.80% | 4.70%
Managed Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 978 | $ 913
Revenues from third party payers, Ratio | 5.60% | 5.90%
Managed Care and Insurers [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues |  | $ 145
Revenues from third party payers | $ 8,545 | $ 7,623
Revenues from third party payers, Ratio | 49.20% | 48.90%
International (Managed Care and Insurers) [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 412 | $ 375
Revenues from third party payers, Ratio | 2.40% | 2.40%
Other [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues | $ 540 | $ 648
Other, Ratio | 3.20% | 4.10%

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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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