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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Summary of commitments to make payments under long-term research agreements As of December 31, 2023, the commitments to make payments under those agreements, and their estimated timing, were as follows:
($ millions)2023
202422 
202533 
202633 
202711 
202813 
Thereafter60 
Total172