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Medical Costs Payable Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Medical costs payable, beginning of period | $ 21,690 | $ 19,891 | $ 17,871
Acquisitions | 316 | 679 | 339
Reported medical costs: |  |  |
Current year | 160,276 | 157,020 | 145,723
Prior years | (880) | (580) | (320)
Total reported medical costs | 159,396 | 156,440 | 145,403
Medical payments: |  |  |
Payments for current year | (139,974) | (137,155) | (127,155)
Payments for prior years | (19,556) | (18,165) | (16,567)
Total medical payments | (159,530) | (155,320) | (143,722)
Medical costs payable, end of period | $ 21,872 | $ 21,690 | $ 19,891

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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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