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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, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 425 $ 419
Additions 47 44
Ending balance 447 425
Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 837 807
Acquisition of businesses (note 11) 26  
Additions 47 44
Fully depreciated assets written off (178) (19)
Disposals (29) (4)
Exchange and other adjustments (7) 9
Ending balance 696 837
Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (412) (388)
Provided (40) (35)
System Fund expense (8) (6)
Fully depreciated assets written off 178 19
Disposals 25 3
Exchange and other adjustments 8 (5)
Ending balance (249) (412)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 302 300
Ending balance 301 302
Land and buildings [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 388 378
Additions 8 9
Fully depreciated assets written off (11)  
Exchange and other adjustments (3) 1
Ending balance 382 388
Land and buildings [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (86) (78)
Provided (6) (7)
Fully depreciated assets written off 11  
Exchange and other adjustments   (1)
Ending balance (81) (86)
Fixtures, fittings and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 123 119
Ending balance 146 123
Fixtures, fittings and equipment [member] | Cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 449 429
Acquisition of businesses (note 11) 26  
Additions 39 35
Fully depreciated assets written off (167) (19)
Disposals (29) (4)
Exchange and other adjustments (4) 8
Ending balance 314 449
Fixtures, fittings and equipment [member] | Accumulated depreciation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (326) (310)
Provided (34) (28)
System Fund expense (8) (6)
Fully depreciated assets written off 167 19
Disposals 25 3
Exchange and other adjustments 8 (4)
Ending balance $ (168) $ (326)