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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
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

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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.

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