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Property, plant and equipment - Summary of Net Book Value of Property, Plant and Equipment by Operating Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment $ 201 $ 309 $ 273
Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 93 134 127
Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 108 $ 175 $ 146
Americas [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 127    
Americas [member] | Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 81    
Americas [member] | Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 46    
EMEAA [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 11    
EMEAA [member] | Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 1    
EMEAA [member] | Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 10    
Central [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 63    
Central [member] | Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 11    
Central [member] | Fixtures, fittings and equipment [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment $ 52