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Medical Costs Payable (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Medical costs payable, beginning of period $ 21,690 $ 19,891
Acquisitions 186 868
Reported medical costs:    
Current year 118,114 117,624
Prior year (800) (460)
Total reported medical costs 117,314 117,164
Medical payments:    
Payments for current year (98,548) (99,487)
Payments for prior years (19,475) (17,497)
Total medical payments (118,023) (116,984)
Medical costs payable, end of period $ 21,167 $ 20,939