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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | $ 767 | $ 788 |
Additions | 97 | 0 |
Changes in estimated fair value | 40 | 50 |
Payments | (106) | (85) |
Fair value, ending balance | 798 | 753 |
Current liability |  |  | $ 138
Contingent consideration | 798 | $ 753 | 798
Sanofi Pasteur |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | 625 |  |
Fair value, ending balance | 608 |  |
Contingent consideration | $ 625 |  | $ 608
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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