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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues | $ 17,487 | $ 16,213 | $ 52,318 | $ 47,665
Revenues ratio from third party payers | 100.00% | 100.00% | 100.00% | 100.00%
Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 2,584 | $ 2,560 | $ 8,043 | $ 7,865
Revenues from third party payers, Ratio | 14.80% | 15.80% | 15.40% | 16.50%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 2,949 | $ 2,535 | $ 8,888 | $ 7,635
Revenues from third party payers, Ratio | 16.90% | 15.60% | 17.00% | 16.00%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 1,208 | $ 1,001 | $ 3,316 | $ 2,478
Revenues from third party payers, Ratio | 6.90% | 6.20% | 6.30% | 5.20%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 1,031 | $ 1,039 | $ 3,042 | $ 2,846
Revenues from third party payers, Ratio | 5.90% | 6.40% | 5.80% | 6.00%
Managed Care and Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 8,497 | $ 7,687 | $ 25,591 | $ 23,140
Revenues from third party payers, Ratio | 48.60% | 47.40% | 49.00% | 48.50%
International (Managed Care and Insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 424 | $ 375 | $ 1,252 | $ 1,127
Revenues from third party payers, Ratio | 2.40% | 2.30% | 2.40% | 2.40%
Other [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues | $ 794 | $ 1,016 | $ 2,186 | $ 2,574
Other, Ratio | 4.50% | 6.30% | 4.10% | 5.40%

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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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