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Acquisitions, Divestitures and Asset Sales - Summary of the Valuation of Goodwill Allocated to Business Segments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | May 02, 2023 | Mar. 29, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 91,272 |  |  | $ 78,150 | $ 79,121
Health Services |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | 34,066 |  |  | 23,615 | 23,615
Pharmacy & Consumer Wellness |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | 10,562 |  |  | 10,376 | 10,376
Health Care Benefits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 46,644 |  |  | $ 44,159 | $ 45,130
Oak Street Health Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 7,213 |  |  |
Oak Street Health Inc. | Health Services |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 6,936 |  |  |
Oak Street Health Inc. | Pharmacy & Consumer Wellness |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 156 |  |  |
Oak Street Health Inc. | Health Care Benefits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 121 |  |  |
Signify Health, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 5,909 |  |
Signify Health, Inc. | Health Services |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | 3,406 |  |
Signify Health, Inc. | Pharmacy & Consumer Wellness |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | 30 |  |
Signify Health, Inc. | Health Care Benefits |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 2,473 |  |

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