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Medical Costs Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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 0 (687)
Reported medical costs:    
Current year 73,731 66,045
Prior year (320) (310)
Total reported medical costs 73,411 65,735
Medical payments:    
Payments for current year (43,827) (38,652)
Payments for prior years (26,669) (24,759)
Total medical payments (70,496) (63,411)
Less: increase in medical costs payable included within businesses held for sale (3) 0
Medical costs payable, end of period $ 37,136 $ 34,032