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Acquisitions, Divestitures, Research Collaborations and License Agreements - Collaborative Arrangements Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2017 | Jul. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Charge for future payments related to AstraZeneca collaboration license options |  |  |  |  |  | $ 750 | $ 0
AstraZeneca |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Upfront and milestone payments made to collaborative partner |  |  |  | $ 1,600 |  |  |
Charge for future payments related to AstraZeneca collaboration license options |  |  |  | 750 |  |  |
Charge related to collaboration formation |  |  |  |  | $ 2,350 |  |
Maximum amount of contingent payments collaborative arrangement |  |  |  | 6,150 |  |  |
Total consideration collaborative arrangement (up to value) |  |  |  | $ 8,500 |  |  |
Period of notice for agreement termination |  |  |  | 180 days |  |  |
AstraZeneca | Forecast |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |
Payments to acquire intangible assets | $ 100 | $ 400 | $ 250 |  |  |  |

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- Definition Represents payments that may be made in the future contingent upon the achievement of regulatory and/or sales milestones as part of a collaborative arrangement. + References No definition available. + Details
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- Definition Total consideration in a collaborative arrangement including upfront and future contingent payments. + References No definition available. + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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