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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 15,276 | $ 13,311 | $ 43,688 | $ 37,240
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 | $ 2,645 | $ 2,603 | $ 7,816 | $ 7,618
Revenues from third party payers, Ratio | 17.30% | 19.60% | 17.90% | 20.50%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 2,124 | $ 1,760 | $ 6,281 | $ 5,074
Revenues from third party payers, Ratio | 13.90% | 13.20% | 14.40% | 13.60%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 692 | $ 445 | $ 1,722 | $ 1,423
Revenues from third party payers, Ratio | 4.50% | 3.30% | 3.90% | 3.80%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 813 | $ 707 | $ 2,369 | $ 1,904
Revenues from third party payers, Ratio | 5.30% | 5.30% | 5.40% | 5.10%
Managed Care and Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 7,998 | $ 6,752 | $ 22,300 | $ 19,028
Revenues from third party payers, Ratio | 52.40% | 50.70% | 51.00% | 51.00%
International (managed care and insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 324 | $ 307 | $ 995 | $ 838
Revenues from third party payers, Ratio | 2.10% | 2.30% | 2.30% | 2.30%
Other [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 680 | $ 737 | $ 2,205 | $ 1,355
Other, Ratio | 4.50% | 5.60% | 5.10% | 3.70%

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