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Net income per common share - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 27, 2020 | Feb. 03, 2020 | Jan. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Initial shares received as part of an accelerated share repurchase program |  | 7,055,919 | 7,055,919 |  | 3,500,000 |  |
Accelerated share repurchases settlement receipt | $ 500 |  |  | $ 250 |  | $ 125 | $ 500
Common Shares Repurchased Accelerated Share Repurchase Agreements |  |  |  | 1,165,607 |  | 2,438,180 |
COVID-19 |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Common Shares Repurchased Accelerated Share Repurchase Agreements | 4,763,216 |  |  |  |  |  |
Accelerate Share Repurchase |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 500 |  |  |  |
Accelerate Share Repurchase | COVID-19 |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |
Common Shares Repurchased Accelerated Share Repurchase Agreements | 4,763,216 |  |  |  |  |  |

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