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Marketable securities - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 02, 2018 | Jul. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Adoption of accounting standard update | $ (3,140) | $ 1,793 | $ 3,035 | $ 3,655 | $ 154 | $ 6,959
Retained earnings |  |  |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Adoption of accounting standard update | $ (6,628) | $ (1,851) | $ (611) | $ 0 | $ 0 | $ 225

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