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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 354 | $ 456
Changes in estimated fair value | (3) | 10
Payments | (126) | (117)
Fair value, ending balance | 225 | $ 349
Sanofi Pasteur |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Current liability | $ 131 |
Contingent consideration, measurement input, discount rate | 0.115 |

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