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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.