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Collaborative Arrangements - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 21 Months Ended | 29 Months Ended | 37 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Jul. 31, 2017 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Mar. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  | $ 2,123 | $ 2,189 | $ 4,331 | $ 4,119 |  |  |  |  |
Other liabilities, noncurrent |  |  |  |  |  | 12,446 |  | 12,446 |  | $ 11,970 |  | $ 11,970 | $ 11,970 |
Lynparza | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |  | 1,300 |  | 1,300 |  |  |  |  |  |
Lenvima | Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |  | 1,200 |  | 1,200 |  |  |  |  |  |
Adempas | Other intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |  | 832 |  | 832 |  |  |  |  |  |
AstraZeneca |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |
License option payment related to collaborative arrangement |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |
AstraZeneca | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  | 2,700 |  |  |  |  |  |
AstraZeneca | Sales-Based Milestones | Lynparza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  | 400 |  |  |  |  |  |  | $ 1,000 |
Liabilities |  |  |  |  |  | 400 |  | 400 |  |  |  |  |  |
Milestone payments made to collaborative partner |  |  |  |  |  |  |  | 250 |  | 200 | $ 250 |  |  |
AstraZeneca | Regulatory Milestones | Lynparza |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments made to collaborative partner |  |  |  |  |  | 135 |  |  |  | 60 | 140 |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  | 1,400 |  |  |  |  |  |
Eisai |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |
License option payment related to collaborative arrangement |  | $ 200 | $ 325 |  |  |  |  |  |  |  |  |  |  |
Eisai | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
License option payment related to collaborative arrangement | $ 125 |  |  |  |  |  |  |  |  |  |  |  |  | $ 650
Eisai | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  | 2,700 |  |  |  |  |  |
Eisai | Sales-Based Milestones | Lenvima |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  | 370 |  |  |  |  |  | $ 950 |  |
Liabilities |  |  |  |  |  | $ 370 |  | 370 |  |  |  |  |  |
Milestone payments made to collaborative partner |  |  |  |  |  |  |  | 500 |  | $ 50 |  |  |  |
Eisai | Regulatory Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  | 135 |  |  |  |  |  |
Eisai | Regulatory Milestones | Lenvima |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments made to collaborative partner |  |  |  |  |  |  |  |  |  |  | 250 |  |  |
Bayer AG | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Probable contingent payments collaborative arrangement |  |  |  |  |  |  |  |  |  |  | 725 |  |  |
Milestone payments made to collaborative partner |  |  |  |  |  |  |  |  |  |  | $ 350 |  |  |
Contingent milestone payments collaborative arrangement |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |

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