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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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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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