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Medical Claims and Benefits Payable - Cumulative Paid Claims and Allocated Claims Adjustment Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Product Information [Line Items] |  |  |
Claims paid | $ 86,970 |  |
Benefit Year 2022 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 27,023 | $ 27,051 | $ 24,345
Benefit Year 2023 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 28,887 | $ 25,615 |
Benefit Year 2024 |  |  |
Product Information [Line Items] |  |  |
Claims paid | $ 31,060 |  |

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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://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
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