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Income Taxes - Summary of Income Taxes (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure Of Income Taxes [line items]    
Current year $ (807)  
Deferred tax (expense)/income 315  
Income tax expense $ (492) $ (1,565) [1]
As Restated [Member]    
Disclosure Of Income Taxes [line items]    
Current year   (1,735)
Deferred tax (expense)/income   170
Income tax expense   $ (1,565)
[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.