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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details) security in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 23,704 | $ 15,820 | $ 13,905
Incurred Claims and Allocated Claims Adjustment Expenses | 54,039 |  |
Total IBNP | 2,480 |  |
Benefit Year 2019 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | 14,040 | 14,083 | $ 14,176
Total IBNP | $ 12 |  |
Cumulative number of reported claims (in claim) | security | 105 |  |
Benefit Year 2020 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 16,056 | $ 16,233 |
Total IBNP | $ 52 |  |
Cumulative number of reported claims (in claim) | security | 140 |  |
Benefit Year 2021 |  |  |
Product Information [Line Items] |  |  |
Incurred Claims and Allocated Claims Adjustment Expenses | $ 23,943 |  |
Total IBNP | $ 2,416 |  |
Cumulative number of reported claims (in claim) | security | 181 |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.W) -URI http://asc.fasb.org/extlink&oid=27015833&loc=d3e570705-122907 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671317-158438 + Details
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