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Commitments and contingencies (Tables) | 12 Months Ended
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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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