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Collaborative Arrangements - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 35 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019 | Mar. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Jan. 31, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  | $ 2,274 |  | $ 1,782 | $ 5,470 | $ 3,612 |  |
Other liabilities, noncurrent |  |  |  |  |  |  | 12,028 |  |  | 12,028 |  | $ 11,117 |
Sales |  |  |  |  |  |  | 10,465 |  | $ 9,930 | 20,502 | $ 19,365 |  |
AstraZeneca |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  |  | $ 1,600 |  |  |  |  |  |  |
Payments to acquire intangible assets |  |  |  |  |  | 750 |  |  |  |  |  | 250 |
Research and development |  |  |  |  |  |  |  |  |  |  |  | 2,350 |
Contingent milestone payments collaborative arrangement |  |  |  |  |  | 6,150 |  |  |  |  |  |  |
Total consideration collaborative arrangement (up to value) |  |  |  |  |  | 8,500 |  |  |  |  |  |  |
AstraZeneca | Lynparza |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | $ 17 | $ 9 |  |  |  |  |
Amortization period |  |  |  |  |  |  | 10 years |  |  |  |  |  |
AstraZeneca | Regulatory Milestones |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  | $ 70 |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  | 2,050 |  |  |  | 1,980 |  |  |
AstraZeneca | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  | $ 4,100 |  |  |  | 3,650 |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  | $ 200 |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  | $ 150 |  |  | $ 200 | 150 |  | 200 |  | 100 |
Eisai |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  | 750 |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  |  | 1,400 |  |  |
Eisai | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire intangible assets | $ 125 | $ 200 | $ 325 |  |  |  |  |  |  |  |  |  | $ 650
Eisai | Lenvima |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 9 years |  |  |  |  |  |
Eisai | Regulatory Milestones |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  | 25 |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  | 385 |  |  |  |  |  |  |  |  |
Eisai | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  | $ 3,970 |  |  |  |  |  |  |  |  |
Bayer AG | Adempas |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  | $ 106 |  |  |  |  |  |
Amortization period |  |  |  |  |  |  | 9 years 6 months |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Bayer AG | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  |  |  |  | $ 350 |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  |  |  | 400 |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  | $ 375 |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  |  |  | $ 375 |  |  | $ 375 |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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