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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions

6 Months Ended

Jun. 30, 2020

Jun. 30, 2019

Disclosure Of Income Taxes [line items]

Income tax expense

$ 492

$ 1,565

^[1]

Effective tax rate

(15.00%)

19.80%

[1]	The unaudited condensed consolidated interim income statement for the six-month period ended 30 June 2019 has been restated to reflect the classification of the Australian operations as discontinued operations.

- 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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