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Medical Claims and Benefits Payable - Medical Claims Reserve Development by Segment (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Product Information [Line Items] |  |  |  |
Medical claims and benefits payable, total reserve development | $ 3,363 | $ 2,696 | $ 1,854 | $ 1,961
Medicaid Segment |  |  |  |
Product Information [Line Items] |  |  |  |
Medical claims and benefits payable, total reserve development | 2,580 | 2,129 | 1,465 | 1,554
Medicare Segment |  |  |  |
Product Information [Line Items] |  |  |  |
Medical claims and benefits payable, total reserve development | 404 | 392 | 267 | 253
Marketplace Segment |  |  |  |
Product Information [Line Items] |  |  |  |
Medical claims and benefits payable, total reserve development | $ 379 | $ 175 | $ 122 | $ 154

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -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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- Details
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