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Risks Arising from Financial Instruments - Analysis of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Financial Assets $ 5,811 $ 5,991
Financial Liabilities 116,790 126,178
Quoted (unadjusted) prices- level 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 58 29
Financial Liabilities 52 46
Quoted (unadjusted) prices- level 1 [member] | Derivative liabilities [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 52 46
Quoted (unadjusted) prices- level 1 [member] | Derivatives [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 58 29
Observable market inputs - level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 620 948
Financial Liabilities 5,834 6,759
Observable market inputs - level 2 [member] | Derivative liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 5,611 6,119
Observable market inputs - level 2 [member] | Derivative liabilities [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 141 353
Observable market inputs - level 2 [member] | Derivative liabilities [member] | Net investment hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 82 287
Observable market inputs - level 2 [member] | Non derivative financial assets [member] | Held-to-maturity investments, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 9 11
Observable market inputs - level 2 [member] | Derivatives [member] | Financial assets at fair value through profit or loss, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 155 457
Observable market inputs - level 2 [member] | Derivatives [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 352 343
Observable market inputs - level 2 [member] | Derivatives [member] | Fair value hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 17 80
Observable market inputs - level 2 [member] | Derivatives [member] | Net investment hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 87 57
Observable Market Inputs - Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 832 1,251
Observable Market Inputs - Level 3 [member] | Derivative liabilities [member] | Deferred consideration on acquisitions [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities $ 832 $ 1,251