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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

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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