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Property, plant and equipment - Summary of Net Book Value of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 309 $ 273
Impairment charges 90  
System Fund impairment charge 5  
Additions 30 77
Transfers to assets classified as held for sale   (23)
Ending balance 201 309
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 514 513
Acquisition of businesses   2
Additions 30 77
Transfers to assets classified as held for sale   (12)
Fully depreciated assets written off (17) (62)
Disposals (3) (6)
Exchange and other adjustments 6 2
Ending balance 530 514
Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (205) (240)
Provided (37) (38)
System Fund expense (5) (2)
Impairment charges (90)  
System Fund impairment charge (5)  
Transfers to assets classified as held for sale   9
Fully depreciated assets written off 17 62
Disposals 2 4
Exchange and other adjustments (6)  
Ending balance (329) (205)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 134 127
Ending balance 93 134
Land and buildings [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 207 199
Acquisition of businesses   1
Additions 2 9
Fully depreciated assets written off   (2)
Disposals (1)  
Ending balance 208 207
Land and buildings [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (73) (72)
Provided (4) (3)
Impairment charges (39)  
Fully depreciated assets written off   2
Disposals 1  
Ending balance (115) (73)
Fixtures, fittings and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 175 146
Ending balance 108 175
Fixtures, fittings and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 307 314
Acquisition of businesses   1
Additions 28 68
Transfers to assets classified as held for sale   (12)
Fully depreciated assets written off (17) (60)
Disposals (2) (6)
Exchange and other adjustments 6 2
Ending balance 322 307
Fixtures, fittings and equipment [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (132) (168)
Provided (33) (35)
System Fund expense (5) (2)
Impairment charges (51)  
System Fund impairment charge (5)  
Transfers to assets classified as held for sale   9
Fully depreciated assets written off 17 60
Disposals 1 4
Exchange and other adjustments (6)  
Ending balance $ (214) $ (132)