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Medical Costs Payable (Tables)
3 Months Ended
Mar. 31, 2021
Insurance [Abstract]  
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense
The following table shows the components of the change in medical costs payable for the three months ended March 31:
(in millions)20212020
Medical costs payable, beginning of period$21,872 $21,690 
Acquisitions12 — 
Reported medical costs:
Current year45,914 41,580 
Prior years(1,010)(580)
Total reported medical costs44,904 41,000 
Medical payments:
Payments for current year
(25,960)(23,471)
Payments for prior years(15,995)(16,447)
Total medical payments(41,955)(39,918)
Medical costs payable, end of period$24,833 $22,772