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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, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disclosure Income Taxes [Line Items]
Net tax expense	$ 361	$ 459	$ 497	$ 820	$ 1,082

- 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)]

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