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Inventories - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Classes of current inventories [abstract]      
Cost of inventories sales $ 9,097 $ 9,953 [1] $ 20,362
Impairment losses on inventories $ 92 $ 27  
[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.