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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 58,752 | $ 51,533 | $ 51,336
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 | $ 10,447 | $ 10,420 | $ 10,798
Revenues from third party payers, Ratio | 17.80% | 20.20% | 21.00%
Managed Medicare [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 8,424 | $ 6,997 | $ 6,452
Revenues from third party payers, Ratio | 14.30% | 13.60% | 12.60%
Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 2,290 | $ 1,965 | $ 1,572
Revenues from third party payers, Ratio | 3.90% | 3.80% | 3.10%
Managed Medicaid [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 3,124 | $ 2,621 | $ 2,450
Revenues from third party payers, Ratio | 5.30% | 5.10% | 4.80%
Managed Care and Other Insurers [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 30,295 | $ 26,535 | $ 26,544
Revenues from third party payers, Ratio | 51.60% | 51.50% | 51.60%
International (Managed Care and Other Insurers) [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 1,336 | $ 1,120 | $ 1,162
Revenues from third party payers, Ratio | 2.30% | 2.20% | 2.30%
Product and Service, Other [Member] |  |  |
Revenues From Third Party Payers [Line Items] |  |  |
Revenues from third party payers | $ 2,836 | $ 1,875 | $ 2,358
Other, Ratio | 4.80% | 3.60% | 4.60%

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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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