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Accounting Policies - Schedule of Revenues from Third Party Payers, Uninsured and Other Payers (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers | $ 13,523 | $ 12,694 | $ 12,602 | $ 12,517 | $ 12,274 | $ 11,451 | $ 11,529 | $ 11,423 | $ 51,336 | $ 46,677 | $ 43,614
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 |  |  |  |  |  |  |  |  | $ 10,798 | $ 9,831 | $ 9,285
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 21.00% | 21.10% | 21.30%
Managed Medicare [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 6,452 | $ 5,497 | $ 4,680
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 12.60% | 11.80% | 10.70%
Medicaid [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 1,572 | $ 1,358 | $ 1,316
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 3.10% | 2.90% | 3.00%
Managed Medicaid [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 2,450 | $ 2,403 | $ 2,165
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 4.80% | 5.10% | 5.00%
Managed Care and Other Insurers [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 26,544 | $ 24,467 | $ 23,342
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 51.60% | 52.40% | 53.50%
International (Managed Care and Other Insurers) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 1,162 | $ 1,156 | $ 1,097
Revenues from third party payers, Ratio |  |  |  |  |  |  |  |  | 2.30% | 2.50% | 2.50%
Product and Service, Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from third party payers |  |  |  |  |  |  |  |  | $ 2,358 | $ 1,965 | $ 1,729
Other, Ratio |  |  |  |  |  |  |  |  | 4.60% | 4.20% | 4.00%

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