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Medical Claims and Benefits Payable - Cumulative Paid Claims and Allocated Claims Adjustment Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Product Information [Line Items] |  |  |
Claims paid | $ 76,560 |  |
Benefit Year 2021 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 23,894 | $ 23,871 | $ 21,148
Benefit Year 2022 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 27,051 | $ 24,345 |
Benefit Year 2023 |  |  |
Product Information [Line Items] |  |  |
Claims paid | $ 25,615 |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4B + Details
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