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Supplemental financial information - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |
Treasury shares issued related to stock compensation (in shares) | 1,568,938 | 6,783,180
Severance and benefit costs |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 24 |
Restructuring payments |  | $ 0

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