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Income taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
Income taxes (Narrative) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure Income Taxes [Line Items]
Net tax expense	$ 581	$ 471	$ 347	$ 1,053	$ 757

- 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