| **Other Financial Information - Comirnaty Gross Profit Split (Details) - USD ($) $ in Millions** | Jun. 30, 2024 | Dec. 31, 2023 |
|--------------------------------------------------------------------------------------------------|---------------|---------------|
| **Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]**              |          |          |
| Other current assets                                                                             | $ 4,190       | $ 4,911       |
| Other current liabilities                                                                        | 16,410        | 20,537        |
| BioNTech [Member] | Comirnaty [Member] | Collaborative Arrangement [Member]                      |          |          |
| **Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]**              |          |          |
| Other current assets                                                                             | $ 275         |          |
| Other current liabilities                                                                        |          | $ 2,000       |

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