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Medical Costs Payable, Incurred and Paid Medical Cost Development (Details) - Health Insurance Product Line [Member] - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Net Incurred Medical Costs | $ 347,771 |
Net Cumulative Medical Payments | (323,706) |
Net remaining outstanding liabilities prior to 2020 | 418 |
Total Medical costs payable | 24,483 |
Short-duration Insurance Contracts, Accident Year 2020 [Member] |  |
Net Incurred Medical Costs | 159,140 | $ 160,276
Net Cumulative Medical Payments | (158,182) | $ (139,974)
Short-duration Insurance Contracts, Accident Year 2021 [Member] |  |
Net Incurred Medical Costs | 188,631 |
Net Cumulative Medical Payments | $ (165,524) |

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