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Medical Costs Payable Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Medical costs payable, beginning of period | $ 24,483 | $ 21,872 | $ 21,690
Acquisitions | 308 | 88 | 316
Reported medical costs: |  |  |
Current year | 211,252 | 188,631 | 160,276
Prior years | (410) | (1,720) | (880)
Total reported medical costs | 210,842 | 186,911 | 159,396
Medical payments: |  |  |
Payments for current year | (184,049) | (165,524) | (139,974)
Payments for prior years | (22,528) | (18,864) | (19,556)
Total medical payments | (206,577) | (184,388) | (159,530)
Medical costs payable, end of period | $ 29,056 | $ 24,483 | $ 21,872

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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 https://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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported. + References No definition available. + Details
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