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Medical Costs Payable (Tables)
6 Months Ended
Jun. 30, 2020
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)20202019
Medical costs payable, beginning of period$21,690  $19,891  
Acquisitions41  522  
Reported medical costs:
Current year76,338  78,523  
Prior years(660) (400) 
Total reported medical costs75,678  78,123  
Medical payments:
Payments for current year
(59,482) (60,707) 
Payments for prior years(18,727) (16,922) 
Total medical payments(78,209) (77,629) 
Medical costs payable, end of period$19,200  $20,907