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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance $ 9,373 $ 9,475
Translation adjustment (221) 201
Reclassifications   (5)
Arising on acquisition (note 30) 810 188
Disposals (40) (6)
Amortisation charge for year (ii) [1] (74) (70)
Impairment charge for year (iii) [2]   (410)
Ending balance 9,848 9,373
Cost/deemed cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 10,638 10,242
Ending balance 11,235 10,638
Accumulated amortisation (and impairment charges) [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (1,265) (767)
Ending balance (1,387) (1,265)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 9,032 9,093
Translation adjustment (221) 198
Reclassifications   0
Arising on acquisition (note 30) 679 157
Disposals (39) (6)
Amortisation charge for year (ii) [1] 0  
Impairment charge for year (iii) [2]   (410)
Ending balance 9,451 9,032
Goodwill [member] | Cost/deemed cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 9,790 9,413
Ending balance 10,251 9,790
Goodwill [member] | Accumulated amortisation (and impairment charges) [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (758) (320)
Ending balance (800) (758)
Marketing related intangibles [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 87 95
Translation adjustment (1) 1
Reclassifications   0
Arising on acquisition (note 30) 32 2
Disposals 0  
Amortisation charge for year (ii) [1] (14) (11)
Impairment charge for year (iii) [2]   0
Ending balance 104 87
Marketing related intangibles [member] | Cost/deemed cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 172 167
Ending balance 202 172
Marketing related intangibles [member] | Accumulated amortisation (and impairment charges) [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (85) (72)
Ending balance (98) (85)
Customer-related intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance [3] 240 265
Translation adjustment [3] 0 2
Reclassifications [3]   0
Arising on acquisition (note 30) [3] 99 29
Disposals [3] (1)  
Amortisation charge for year (ii) [1],[3] (56) (56)
Impairment charge for year (iii) [2]   0
Ending balance [3] 282 240
Customer-related intangible assets [member] | Cost/deemed cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance [3] 601 575
Ending balance [3] 705 601
Customer-related intangible assets [member] | Accumulated amortisation (and impairment charges) [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance [3] (361) (310)
Ending balance [3] (423) (361)
Contract based intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14 22
Translation adjustment 1  
Reclassifications   (5)
Arising on acquisition (note 30) 0  
Disposals 0  
Amortisation charge for year (ii) [1] (4) (3)
Impairment charge for year (iii) [2]   0
Ending balance 11 14
Contract based intangible assets [member] | Cost/deemed cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 75 87
Ending balance 77 75
Contract based intangible assets [member] | Accumulated amortisation (and impairment charges) [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (61) (65)
Ending balance $ (66) $ (61)
[1] The amortisation charge primarily relates to customer-related intangible assets.
[2] Further details on note (iii) are set out overleaf.
[3] The customer-related intangible assets relate predominantly to non-contractual customer relationships.