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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
Income taxes (Details) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Income/(loss) before tax	$ 4,905	$ 4,513	$ (720)	$ 9,417	$ (640)	$ (4,259)
Income tax	$ (2,962)	$ (2,659)	$ 469	$ (5,620)	$ (316)	$ (1,237)
Effective tax rate	60.40%	58.90%	65.20%	59.70%	(49.50%)	(29.00%)

- Definition

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

+ References + Details