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Medical Costs Payable (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Medical costs payable, beginning of period | $ 39,337 | $ 34,224
Reported medical costs: |  |
Current year | 74,726 | 73,731
Prior year | (1,050) | (320)
Changes in premium deficiency and loss contract reserves | (187) |
Total reported medical costs | 73,489 | 73,411
Medical payments: |  |
Payments for current year | (44,021) | (43,827)
Payments for prior years | (29,205) | (26,669)
Total medical payments | (73,226) | (70,496)
Change in medical costs payable included within businesses held for sale | 59 | (3)
Medical costs payable, end of period | $ 39,659 | $ 37,136

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