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Cash and cash equivalents and investment securities - Summary of Cash and Cash Equivalents and Investments in Short-Term Debt Securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
 [1],[2]
Dec. 31, 2018
 [1],[2]
Disclosure of detailed information about borrowings [abstract]        
Short-term bank deposits $ 2,977 $ 2,236    
Treasury Bills 17,155    
Cash and bank accounts 4,886 5,002    
Cash and cash equivalents 25,018 7,238    
Bank overdrafts (153) (68)    
Total $ 24,865 $ 7,169 $ 8,075 $ 6,960
[1] The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2019 has been restated to reflect the classification of the Australian operations as discontinued operations.
[2] The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2020 has been presented to include operating, investing and financing activities from discontinued operations separately in the cashflow statement. The unaudited condensed consolidated interim statement of cash flows for the six-month period ended 30 June 2019 has been restated to reflect this change in presentation.