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Medical Claims Liability - Cumulative Incurred and Paid Claims (Details) - Health insurance product line - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	$ 298,416
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net	281,844
All outstanding liabilities prior to 2020, net of reinsurance	147
Medical claims liability, net of reinsurance	16,719
Short-Duration Insurance Contract, Accident Year 2020
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	86,433	$ 86,502	$ 88,206
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net	86,021	85,593	$ 76,722
Short-Duration Insurance Contract, Accident Year 2021
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	99,087	100,385
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net	98,024	$ 87,427
Short-Duration Insurance Contract, Accident Year 2022
Claims Development [Line Items]
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net	112,896
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net	$ 97,799

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- Definition

Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Other

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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 https://asc.fasb.org/extlink&oid=116884468&loc=SL65671311-158438

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 4B
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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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