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Other investments - Summary of Other investments (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Detailed Information About Other Investment Explanatory [Line Items]    
Non-current investments $ 1,241 $ 377
Current investments 3,240 1,298
Other investments 4,481 1,675
Time deposits [member]    
Disclosure of Detailed Information About Other Investment Explanatory [Line Items]    
Non-current investments 2 [1]
Current investments 3,176 1,282
Debt investments – at FVTPL [Member]    
Disclosure of Detailed Information About Other Investment Explanatory [Line Items]    
Non-current investments 621 234
Current investments 64 16
Equity investments – at FVTPL [Member]    
Disclosure of Detailed Information About Other Investment Explanatory [Line Items]    
Non-current investments $ 618 $ 143
[1] Amount less than $1 million