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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | $ 829 | $ 841 | $ 767
Additions |  | 0 | 97
Changes in estimated fair value |  | 73 | 71
Payments |  | 0 | (106)
Other |  | (12) | 0
Fair value, ending balance | 841 | 902 | 829
Current liability |  | 289 |
Contingent consideration | 841 | 902 | $ 829
Sanofi Pasteur |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance |  | 711 |
Fair value, ending balance | 711 | 747 |
Contingent consideration | $ 711 | $ 747 |
Contingent consideration, measurement input, discount rate |  | 0.115 |
Measurement Input, Discount Rate | Sanofi Pasteur |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Contingent consideration, measurement input, discount rate |  | 0.08 |

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