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Medical Costs Payable, Incurred and Paid Medical Cost Development (Details) - Health Insurance Product Line [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Net Incurred Medical Costs | $ 316,493 |
Net Cumulative Medical Payments | (295,124) |
Net remaining outstanding liabilities prior to 2019 | 503 |
Total Medical costs payable | 21,872 |
Short-duration Insurance Contracts, Accident Year 2019 [Member] |  |
Net Incurred Medical Costs | 156,217 | $ 157,020
Net Cumulative Medical Payments | (155,150) | $ (137,155)
Short-duration Insurance Contracts, Accident Year 2020 [Member] |  |
Net Incurred Medical Costs | 160,276 |
Net Cumulative Medical Payments | $ (139,974) |

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