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Collaborative Arrangements - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 35 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019 | Sep. 30, 2018 | Aug. 31, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Jan. 31, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  |  | $ 2,068 |  |  | $ 4,413 | $ 7,538 | $ 8,024 |  |
Other liabilities, noncurrent |  |  |  | $ 11,887 |  |  |  |  | 11,887 |  |  |  | 11,887 |  | $ 11,117 |
Sales |  |  |  |  |  |  |  |  | 10,794 |  |  | 10,325 | 31,296 | 29,689 |  |
Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 761 |  |  | 775 | 2,353 | 2,320 |  |
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,030 |  |  | 4,594 | 13,425 | 13,096 |  |
Lynparza | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | 468 |  |  |  |  | 468 |  |  |  | 468 |  |  |
Lenvima | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | 266 |  |  |  |  | 266 |  |  |  | 266 |  |  |
Adempas | Other intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | 1,100 |  |  |  |  | 1,100 |  |  |  | 1,100 |  |  |
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 |  | $ 2,350 | 2,350 |
AstraZeneca | Lynparza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  | $ 17 | $ 9 |  |  |  |  |
AstraZeneca | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  |  | $ 150 |  |  |  | 200 | 150 |  |  |  | 100 |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  |  |  |  |  |  | 3,650 |  |  |
AstraZeneca | Regulatory Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  |  |  |  |  |  | 1,930 |  |  |
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 | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  | 50 |  |  |  |  | $ 50 |  |  |  | 50 |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  | 3,970 |  |  |  |  |  |  | 3,920 |  |  |
Eisai | Regulatory Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  | 385 |  |  |  |  |  |  | 160 |  |  |
Eisai | Regulatory Milestones | Japan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |
Eisai | Regulatory Milestones | United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  | $ 125 |  |  |  |  |  |  |  |  |  |  |
Eisai | Regulatory Milestones | European Union |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |
Eisai | Regulatory Milestones | China |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Bayer AG | Adempas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  | 106 |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500 |
Bayer AG | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  |  |  |  |  |  |  | $ 350 |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  |  |  |  | 375 |  |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  |  |  |  |  |  | $ 375 |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |

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