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Medical Costs Payable (Tables)
12 Months Ended
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)202020192018
Medical costs payable, beginning of period$21,690 $19,891 $17,871 
Acquisitions316 679 339 
Reported medical costs:
Current year160,276 157,020 145,723 
Prior years(880)(580)(320)
Total reported medical costs159,396 156,440 145,403 
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,
Year20192020
2019$157,020 $156,217 
2020160,276 
Total$316,493 
Net Cumulative Medical Payments
 (in millions)For the Years Ended December 31,
Year20192020
2019$(137,155)$(155,150)
2020(139,974)
Total(295,124)
Net remaining outstanding liabilities prior to 2019503 
Total medical costs payable$21,872