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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues | $ 14,820 | $ 14,435 | $ 29,765 | $ 28,412
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 | $ 2,495 | $ 2,612 | $ 5,221 | $ 5,171
Revenues from third party payers, Ratio | 16.80% | 18.10% | 17.50% | 18.20%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 2,260 | $ 2,104 | $ 4,584 | $ 4,157
Revenues from third party payers, Ratio | 15.20% | 14.60% | 15.40% | 14.60%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 611 | $ 503 | $ 1,190 | $ 1,030
Revenues from third party payers, Ratio | 4.10% | 3.50% | 4.00% | 3.60%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 954 | $ 831 | $ 2,064 | $ 1,556
Revenues from third party payers, Ratio | 6.40% | 5.80% | 6.90% | 5.50%
Managed Care and Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 7,144 | $ 7,417 | $ 14,296 | $ 14,302
Revenues from third party payers, Ratio | 48.40% | 51.30% | 48.10% | 50.40%
International (Managed Care and Insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 325 | $ 338 | $ 681 | $ 671
Revenues from third party payers, Ratio | 2.20% | 2.30% | 2.30% | 2.40%
Other [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues | $ 1,031 | $ 630 | $ 1,729 | $ 1,525
Other, Ratio | 6.90% | 4.40% | 5.80% | 5.30%

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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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