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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | $ 841 | $ 767 | $ 767
Additions | 0 | 97 |
Changes in estimated fair value | 50 | 40 |
Payments | 0 | (106) |
Other | (12) | 0 |
Fair value, ending balance | 879 | 798 | 841
Current liability | 297 |  |
Contingent consideration | 879 | $ 798 | 841
Sanofi Pasteur |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | 711 |  |
Fair value, ending balance | 759 |  | 711
Contingent consideration | $ 759 |  | $ 711
Contingent consideration, measurement input, discount rate (as percent) | 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 (as percent) | 0.08 |  |

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