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Exceptional items - Summary of Exceptional Items Included in Income Statement (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Disclosure Of Exceptional Items [abstract]      
Impairment of goodwill $ (2,500) $ (2,500)  
COVID-19 costs   (78)  
Restructuring   (60) $ (58) [1]
Business and asset disposal (including exceptional impairment losses)   (154) (24)
Acquisition costs business combinations   (4) (21) [1]
Impact on profit from operations   $ (2,796) $ (103)
[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.