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Medical Costs Payable (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 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 8
Reported medical costs:    
Current year 60,315 52,813
Prior year (470) (290)
Total reported medical costs 59,845 52,523
Medical payments:    
Payments for current year (35,087) (29,589)
Payments for prior years (22,006) (18,749)
Total medical payments (57,093) (48,338)
Medical costs payable, end of period $ 31,809 $ 28,676