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Medical Costs Payable (Notes) | 12 Months Ended
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Dec. 31, 2020
Insurance [Abstract] |
Medical Costs Payable | Medical Costs Payable 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 |
For the years ended December 31, 2020 and 2019 medical cost reserve development was primarily driven by lower than expected health system utilization levels. For the year ended December 31, 2018, no individual factors significantly impacted medical cost reserve development. Medical costs payable included IBNR of $14.8 billion and $13.8 billion at December 31, 2020 and 2019, respectively. Substantially all of the IBNR balance as of December 31, 2020 relates to the current year. 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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- References No definition available. + Details
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- Definition The entire disclosure for insurance products considered to be short-duration contracts because the contract provides insurance protection for a fixed period of short duration and enables the insurer to cancel the contract or to adjust the provisions of the contract at the end of any contract period, such as adjusting the amount of premiums charged or coverage provided, and on contracts on which amounts are paid but insurance risk is not transferred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -URI http://asc.fasb.org/topic&trid=2303980 + Details
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