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Medical Costs Payable (Tables)
6 Months Ended
Jun. 30, 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 six months ended June 30:
(in millions)20212020
Medical costs payable, beginning of period$21,872 $21,690 
Acquisitions46 41 
Reported medical costs:
Current year92,570 76,338 
Prior years(1,120)(660)
Total reported medical costs91,450 75,678 
Medical payments:
Payments for current year
(69,808)(59,482)
Payments for prior years(18,429)(18,727)
Total medical payments(88,237)(78,209)
Medical costs payable, end of period$25,131 $19,200