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Medical Costs Payable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]    
Medical costs payable, beginning of period $ 34,224 $ 32,395
Acquisitions (dispositions), net 20 (755)
Reported medical costs:    
Current year 231,984 197,750
Prior year (30) (600)
Total reported medical costs 231,954 197,150
Medical payments:    
Payments for current year (195,548) (165,544)
Payments for prior years (30,453) (29,095)
Total medical payments (226,001) (194,639)
Less: increase in medical costs payable included within businesses held for sale (16) (200)
Medical costs payable, end of period $ 40,181 $ 33,951