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Commitments and contingencies (Tables) | 12 Months Ended
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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 |
2021 | 26 |  |
2022 | 5 |  |
2023 | 1 |  |
2024 | 1 |  |
2025 | — |  |
Thereafter | 47 |  |
Total | 80 |  |

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