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Medical Costs Payable (Details) - USD ($) $ in Millions | 9 Months Ended
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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

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