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Legal proceedings and contingent liabilities - Legal proceedings (Details)
$ in Millions
1 Months Ended
Jul. 28, 2023
USD ($)
Mar. 31, 2023
Aug. 31, 2019
entity
subsidiary
Jan. 31, 2023
patent
Jul. 31, 2020
USD ($)
Oct. 31, 2012
Legal proceedings after the end of reporting period | Imfinzi and Imjudo US patent proceedings            
Commitments and contingent liabilities            
Amount of provisions made $ 510          
Imjudo patent proceedings            
Commitments and contingent liabilities            
Number of patents involved in patent proceedings | patent       2    
Legal proceedings | PARP Inhibitor Royalty Dispute            
Commitments and contingent liabilities            
Number of disputed royalty-bearing patent license agreements           2
Legal proceedings | Brazilian Tax Assessment Matter            
Commitments and contingent liabilities            
Number of subsidiaries involved in tax assessment matter | subsidiary     2      
Number of external entities involved in tax assessment matter | entity     2      
PARP Inhibitor Royalty Dispute            
Commitments and contingent liabilities            
Number of disputed royalty-bearing patent license agreements           2
Pay Equity Litigation            
Commitments and contingent liabilities            
Number of plaintiffs in case   3        
Definiens commercial litigation            
Commitments and contingent liabilities            
Amount of claims against entity         $ 140