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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Contingent consideration, beginning balance | $ 354 | $ 456
Changes in estimated fair value | (10) | 15
Payments | (151) | (117)
Contingent consideration, ending balance | 193 | $ 354
Contingent consideration, liability, current | 148 |
Sanofi Pasteur |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Payments | (126) |
Contingent consideration, liability, current | $ 123 |
Contingent consideration, measurement input, discount rate | 0.115 |

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