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Medical Costs Payable (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
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
Acquisitions | 8 | 12
Reported medical costs: |  |
Current year | 52,813 | 45,914
Prior year | (290) | (1,010)
Total reported medical costs | 52,523 | 44,904
Medical payments: |  |
Payments for current year | (29,589) | (25,960)
Payments for prior years | (18,749) | (15,995)
Total medical payments | (48,338) | (41,955)
Medical costs payable, end of period | $ 28,676 | $ 24,833

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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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