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Acquisition, Divestitures, Licensing Arrangements, Collaborative Arrangements and Privately Held Investment - Biogen (Details) - Disposed of by Sale [Member] - Phase 2b Ready AMPA Receptor Potentiator For CIAS [Member] - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018
Indefinite-lived Intangible Assets [Line Items] |  |  |
Proceeds from sale of Phase 2b Ready AMPA Receptor Potentiator for CIAS to Biogen | $ 75 | $ 75 |
Potential development and commercialization milestones | $ 515 |  |
Other (Income)/Deductions, Net [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Proceeds from sale of Phase 2b Ready AMPA Receptor Potentiator for CIAS to Biogen |  |  | $ 75

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