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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Goodwill [Line Items] |  |  |  |  |
Impairment loss |  | $ (6,723) |  |  |
Impairment charge |  |  | $ 7,311 | $ 13 | $ 529
Amortization expense |  |  | 685 | $ 692 | $ 718
Disposal Group, Held-for-Sale, Not Discontinued Operations | Magellan Health |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment loss | $ (513) |  |  |  |
Intangible assets, current | $ 140 |  | 140 |  |
Impairment charge |  |  | $ 55 |  |

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