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Financial Instruments - Information About Changes in Liabilities for Contingent Consideration (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | $ 841 | $ 767 |
Changes in estimated fair value | (13) | 33 |
Payments | 0 | (106) |
Other | (12) | 0 |
Fair value, ending balance | 816 | 694 |
Current liability |  |  | $ 285
Contingent consideration | 816 | $ 694 | 816
Sanofi Pasteur |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value, beginning balance | 711 |  |
Fair value, ending balance | 697 |  |
Contingent consideration | $ 711 |  | $ 697
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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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + Details
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