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Other (Income)/Deductions - Net - Footnotes - Collaborative Arrangements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Apr. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2018
Licensing Agreements [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Proceeds received from upfront payments and milestone payments |  |  | $ 118 |  |  |
Proceeds from licensing arrangement |  |  |  | $ 101 | $ 33 |
Shire [Member] | Licensing Agreements [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Proceeds from licensing arrangement | $ 35 | $ 75 | 110 |  |  |
Merck [Member] | Collaborative Arrangement [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Proceeds received from upfront payments and milestone payments |  |  | 40 | 150 |  |
Phase 2b Ready AMPA Receptor Potentiator For CIAS [Member] | Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Cash received for disposition |  |  | 85 |  |  | $ 75
Distribution Rights [Member] |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |
Gain related to sale of intangible assets |  |  | $ 62 | $ 85 | $ 50 |

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- Definition Amount of gain (loss) on sale or disposal of intangible assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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