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Medical Costs Payable (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Medical costs payable, beginning of period $ 29,056 $ 24,483
Acquisitions 1 177
Reported medical costs:    
Current year 180,423 157,601
Prior year (760) (350)
Total reported medical costs 179,663 157,251
Medical payments:    
Payments for current year (149,671) (130,788)
Payments for prior years (26,257) (22,059)
Total medical payments (175,928) (152,847)
Medical costs payable, end of period $ 32,792 $ 29,064