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Medical Costs Payable (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 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 1 171
Reported medical costs:    
Current year 120,773 104,936
Prior year (660) (320)
Total reported medical costs 120,113 104,616
Medical payments:    
Payments for current year (91,621) (78,937)
Payments for prior years (25,602) (21,355)
Total medical payments (117,223) (100,292)
Medical costs payable, end of period $ 31,947 $ 28,978