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Segmental Information - Summary of Information by Reportable Segment - Reconciliation of Capital Expenditure (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reportable segments [line items]      
Capital expenditure per management reporting $ 243 $ 336 $ 238
Contract acquisition costs (58) (57)  
Landlord contributions to property, plant and equipment 8 14  
Timing differences and other adjustments 1 (13)  
Additions per the Financial Statements 194 280  
Property, plant and equipment 47 44  
Intangible assets 112 172  
Investment in associates and joint ventures 3 47  
Other financial assets 32 17  
Additions per the Financial Statements 194 280  
Americas [member]      
Disclosure of reportable segments [line items]      
Capital expenditure per management reporting 74 120 67
Contract acquisition costs (32) (36)  
Landlord contributions to property, plant and equipment 0    
Timing differences and other adjustments 1 (12)  
Additions per the Financial Statements 43 72  
Property, plant and equipment 13 10  
Intangible assets 0 3  
Investment in associates and joint ventures 3 47  
Other financial assets 27 12  
Additions per the Financial Statements 43 72  
EMEAA [member]      
Disclosure of reportable segments [line items]      
Capital expenditure per management reporting 33 26 22
Contract acquisition costs (26) (21)  
Landlord contributions to property, plant and equipment 0    
Timing differences and other adjustments 0    
Additions per the Financial Statements 7 5  
Property, plant and equipment 2    
Intangible assets 0    
Investment in associates and joint ventures 0    
Other financial assets 5 5  
Additions per the Financial Statements 7 5  
Greater China [member]      
Disclosure of reportable segments [line items]      
Capital expenditure per management reporting 2 2 1
Contract acquisition costs 0    
Landlord contributions to property, plant and equipment 0    
Timing differences and other adjustments 0    
Additions per the Financial Statements 2 2  
Property, plant and equipment 2 2  
Intangible assets 0    
Investment in associates and joint ventures 0    
Other financial assets 0    
Additions per the Financial Statements 2 2  
Central [member]      
Disclosure of reportable segments [line items]      
Capital expenditure per management reporting 134 188 $ 148
Contract acquisition costs 0    
Landlord contributions to property, plant and equipment 8 14  
Timing differences and other adjustments 0 (1)  
Additions per the Financial Statements 142 201  
Property, plant and equipment 30 32  
Intangible assets 112 169  
Investment in associates and joint ventures 0    
Other financial assets 0    
Additions per the Financial Statements $ 142 $ 201