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Medical Claims and Benefits Payable - Cumulative Paid Claims and Allocated Claims Adjustment Expenses (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Product Information [Line Items] |  |  |
Claims paid | $ 51,180 |  |
Benefit Year 2019 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 14,028 | $ 14,056 | $ 12,554
Benefit Year 2020 |  |  |
Product Information [Line Items] |  |  |
Claims paid | 16,004 | $ 13,871 |
Benefit Year 2021 |  |  |
Product Information [Line Items] |  |  |
Claims paid | $ 21,148 |  |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438 + Details
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