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Medical Claims Liability - Schedule of Cumulative Incurred and Paid Claims (Details) - Health insurance product line - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 404,815 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 384,436 |  |
All outstanding liabilities prior to 2023, net of reinsurance | 290 |  |
Magellan Health medical claims liabilities held for sale | (109) |  |
Medical claims liability, net of reinsurance | 20,560 |  |
2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 118,324 | $ 118,709 | $ 120,680
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 118,114 | 117,635 | 104,725
2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 126,382 | 128,312 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 125,631 | 111,456 |
2025 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 160,109 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 140,691 |  |
Medicaid | Operating Segments |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 241,851 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 231,593 |  |
All outstanding liabilities prior to 2023, net of reinsurance | 101 |  |
Medical claims liability, net of reinsurance | 10,359 |  |
Medicaid | Operating Segments | 2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 78,282 | 78,517 | 79,747
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 78,194 | 77,952 | 69,904
Medicaid | Operating Segments | 2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 77,872 | 78,885 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 77,527 | 69,351 |
Medicaid | Operating Segments | 2025 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 85,697 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 75,872 |  |
Medicare | Operating Segments |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 74,497 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 70,108 |  |
All outstanding liabilities prior to 2023, net of reinsurance | 104 |  |
Medical claims liability, net of reinsurance | 4,493 |  |
Medicare | Operating Segments | 2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 18,830 | 19,008 | 19,487
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 18,783 | 18,778 | 16,631
Medicare | Operating Segments | 2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 20,798 | 21,171 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 20,674 | 18,036 |
Medicare | Operating Segments | 2025 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 34,869 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 30,651 |  |
Commercial | Operating Segments |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 83,149 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 77,611 |  |
All outstanding liabilities prior to 2023, net of reinsurance | 85 |  |
Medical claims liability, net of reinsurance | 5,623 |  |
Commercial | Operating Segments | 2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 19,725 | 19,698 | 19,966
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 19,650 | 19,420 | 16,823
Commercial | Operating Segments | 2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 26,027 | 26,548 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 25,748 | 22,547 |
Commercial | Operating Segments | 2025 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 37,397 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 32,213 |  |
Other | Operating Segments |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 5,318 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 5,124 |  |
All outstanding liabilities prior to 2023, net of reinsurance | 0 |  |
Magellan Health medical claims liabilities held for sale | (109) |  |
Medical claims liability, net of reinsurance | 85 |  |
Other | Operating Segments | 2023 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,487 | 1,486 | 1,480
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,487 | 1,485 | $ 1,367
Other | Operating Segments | 2024 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,685 | 1,708 |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 1,682 | $ 1,522 |
Other | Operating Segments | 2025 |  |  |
Claims Development [Line Items] |  |  |
Cumulative Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | 2,146 |  |
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance | $ 1,955 |  |

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