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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details) claim in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) claim | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 28,669 | $ 27,175 | $ 23,704
Incurred Claims and Allocated Claims Adjustment Expenses | 80,136 |  |
Total IBNP | 2,898 |  |
Benefit Year 2021 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | 23,912 | 23,979 | $ 24,167
Total IBNP | $ 18 |  |
Cumulative number of reported claims (in claim) | claim | 133 |  |
Benefit Year 2022 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 27,128 | $ 27,459 |
Total IBNP | $ 77 |  |
Cumulative number of reported claims (in claim) | claim | 163 |  |
Benefit Year 2023 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 29,096 |  |
Total IBNP | $ 2,803 |  |
Cumulative number of reported claims (in claim) | claim | 153 |  |

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- Definition Liability For Unpaid Claims And Claims Adjustment Expense, Incurred Claims Including Acquisition Adjustment + References No definition available. + Details
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- Definition Estimated costs as of the balance sheet date of settling insured claims and costs incurred in the claims settlement process for claims that have not yet been submitted to the insurance company for reimbursement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479583/944-40-S99-1 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Cumulative number of reported claims for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (b) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4D + Details
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