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Property, plant and equipment Property, plant, and equipment - Summary of Right-of-Use Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of detailed information about property, plant and equipment [Line Items]        
Net book value $ 1,065 $ 0   $ 1,022
Additions for the year 301      
Depreciation for the year (included within operating costs) (272)      
Impairment loss recognised in profit or loss 3,487 $ 132 $ 796  
Land and buildings [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Net book value 507     463
Additions for the year 89      
Depreciation for the year (included within operating costs) (69)      
Plant and equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Net book value 558     559
Additions for the year 212      
Depreciation for the year (included within operating costs) (203)      
I F R S16 [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Net book value       991
I A S17 [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Net book value       $ 31
Right-of-use assets [member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss recognised in profit or loss (10)      
Right-of-use assets [member] | Land and buildings [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss recognised in profit or loss (6)      
Right-of-use assets [member] | Plant and equipment [Member]        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Impairment loss recognised in profit or loss $ (4)