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Property, plant and equipment - Summary of right-of-use assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value $ 1,134 $ 875  
Additions for the year 542 105  
Depreciation for the year (included within operating costs) (332) (322)  
Impairment charges of consolidated balances (269) (904) $ (3,487)
Land and buildings      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value 549 475  
Additions for the year 135 30  
Depreciation for the year (included within operating costs) (81) (93)  
Plant and equipment      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Net book value 585 400  
Additions for the year 407 75  
Depreciation for the year (included within operating costs) (251) (229)  
Right-of-use assets      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Impairment charges of consolidated balances 0 (37)  
Right-of-use assets | Land and buildings      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Impairment charges of consolidated balances 0 (6)  
Right-of-use assets | Plant and equipment      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Impairment charges of consolidated balances $ 0 $ (31)