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Acquisitions and divestitures - Five Prime Therapeutics Inc. (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 16, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Total cash consideration   $ 3,839 $ 2,529 $ 0
Acquired in-process research and development   $ 0 $ 1,505 $ 0
Five Prime Therapeutics, Inc.        
Business Acquisition [Line Items]        
Total cash consideration $ 1,600      
Acquired in-process research and development 1,500      
Deferred tax assets 177      
Other liabilities $ 47