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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Summary of commitments to make payments under long-term research agreements As of December 31, 2020, the commitments to make payments under those agreements, and their estimated timing, were as follows:
($ millions)2020
202126 
20225 
20231 
20241 
2025— 
Thereafter47 
Total80