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Risks Arising from Financial Instruments - Analysis of Financial Instruments (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Quoted (unadjusted) prices- level 1 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets $ 85 $ 19
Financial Liabilities 20 21
Quoted (unadjusted) prices- level 1 [member] | Derivative liabilities [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 20 21
Quoted (unadjusted) prices- level 1 [member] | Non derivative financial assets [member] | Held-to-maturity investments, category [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets   2
Quoted (unadjusted) prices- level 1 [member] | Derivatives [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 85 17
Observable market inputs - level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 766 354
Financial Liabilities 6,844 4,130
Observable market inputs - level 2 [member] | Derivative liabilities [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 438 586
Observable market inputs - level 2 [member] | Derivative liabilities [member] | Fair value hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities   103
Observable market inputs - level 2 [member] | Derivative liabilities [member] | Deferred consideration on acquisitions [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities  
Observable market inputs - level 2 [member] | Derivatives at fair value through profit and loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 6,406 3,441
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 9
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 312 119
Observable market inputs - level 2 [member] | Derivatives [member] | Cash flow hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 227 153
Observable market inputs - level 2 [member] | Derivatives [member] | Fair value hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 91 19
Observable market inputs - level 2 [member] | Derivatives [member] | Net investment hedges [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Assets 127 54
Observable Market Inputs - Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial Liabilities 1,423 1,639
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 $ 1,423 $ 1,639