XML 54 R42.htm IDEA: XBRL DOCUMENT v3.8.0.1
Acquisitions, Research Collaborations and License Agreements - Collaborative Arrangements Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 35 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Jan. 31, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Research and development         $ 3,196 $ 1,830  
Eisai              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Upfront and milestone payments       $ 750      
Research and development         $ 1,400    
Eisai | Future Regulatory Milestones              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Contingent payments collaborative arrangement       385      
Eisai | Future Sales-Based Milestones              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Contingent payments collaborative arrangement       $ 3,970      
Eisai | Forecast              
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]              
Payments to acquire intangible assets $ 125 $ 200 $ 325       $ 650