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Assets classified as held for sale, liabilities associated with assets held for sale and discontinued operations - Results From Discontinued Operations (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Disclosure of Assets Classified as Held for Sale and Discontinued Operations [line items]    
Revenue $ 21,298 $ 25,823 [1]
Profit from continuing operations (3,744) 6,406 [1]
Profit from discontinued operations 2,055 236 [1]
AUSTRALIA    
Disclosure of Assets Classified as Held for Sale and Discontinued Operations [line items]    
Revenue 477 730
Profit from continuing operations 178 367
Profit from discontinued operations $ 136 $ 236
[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.