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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 12,602 | $ 11,529 | $ 25,119 | $ 22,952
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 | $ 2,635 | $ 2,425 | $ 5,405 | $ 4,949
Revenues from third party payers, Ratio | 20.90% | 21.00% | 21.50% | 21.60%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 1,595 | $ 1,345 | $ 3,184 | $ 2,744
Revenues from third party payers, Ratio | 12.70% | 11.70% | 12.70% | 12.00%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 416 | $ 357 | $ 763 | $ 638
Revenues from third party payers, Ratio | 3.30% | 3.10% | 3.00% | 2.80%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 554 | $ 586 | $ 1,167 | $ 1,147
Revenues from third party payers, Ratio | 4.40% | 5.10% | 4.60% | 5.00%
Managed Care and Other Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 6,425 | $ 5,993 | $ 12,851 | $ 12,055
Revenues from third party payers, Ratio | 50.90% | 51.90% | 51.10% | 52.50%
International (Managed Care and Other Insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 284 | $ 295 | $ 581 | $ 600
Revenues from third party payers, Ratio | 2.30% | 2.60% | 2.30% | 2.60%
Product and Service, Other [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 693 | $ 528 | $ 1,168 | $ 819
Other, Ratio | 5.50% | 4.60% | 4.80% | 3.50%

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