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Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2019

Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]

Summary of commitments to make payments under long-term research agreements

As of December 31, 2019, the commitments to make payments under those agreements, and their estimated timing, were as follows:

($ millions)	2019
2020	28
2021	41
2022	4
2023	4
2024	33
Thereafter	71
Total	181

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