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Medical Costs Payable (Tables) | 12 Months Ended
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Dec. 31, 2020
Insurance [Abstract] |
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] | The following table shows the components of the change in medical costs payable for the years ended December 31:
(in millions) |  | 2020 |  | 2019 |  | 2018
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 |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block] | The following is information about incurred and paid medical cost development as of December 31, 2020:
|  | Net Incurred Medical Costs
(in millions) |  | For the Years Ended December 31,
Year |  | 2019 |  | 2020
2019 |  | $ | 157,020 |  |  | $ | 156,217 |
2020 |  |  |  | 160,276 |
Total |  |  |  | $ | 316,493 |
|  | Net Cumulative Medical Payments
(in millions) |  | For the Years Ended December 31,
Year |  | 2019 |  | 2020
2019 |  | $ | (137,155) |  |  | $ | (155,150) |
2020 |  |  |  | (139,974) |
Total |  |  |  | (295,124) |
Net remaining outstanding liabilities prior to 2019 |  |  |  | 503 |
Total medical costs payable |  |  |  | $ | 21,872 |

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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + 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 -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Tabular disclosure for the reconciliation of claims development to the liability for unpaid claims and claim adjustment expense for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=116884468&loc=SL65671315-158438 + Details
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