FINANCIAL INSTRUMENTS - Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]
Fair value of financial assets	$ 7,068	$ 6,021
Fair value of financial liabilities	$ (62,406)	$ (62,047)
Net investment hedges \| Interest rate caps of US$ LIBOR debt
Disclosure of detailed information about financial instruments [line items]
Notional	9,590	8,371
Fair value of financial assets	$ 0	$ 0
Net investment hedges \| Interest rate caps of US$ LIBOR debt \| Bottom of range
Disclosure of detailed information about financial instruments [line items]
Rates	2.50%	2.50%
Net investment hedges \| Interest rate caps of US$ LIBOR debt \| Top of range
Disclosure of detailed information about financial instruments [line items]
Rates	500.00%	550.00%
Net investment hedges \| Interest rate swaps of US$ LIBOR debt
Disclosure of detailed information about financial instruments [line items]
Notional	2,130	2,380
Fair value of financial liabilities	$ (50)	$ (112)
Net investment hedges \| Interest rate swaps of US$ LIBOR debt \| Bottom of range
Disclosure of detailed information about financial instruments [line items]
Rates	1.00%	1.00%
Net investment hedges \| Interest rate swaps of US$ LIBOR debt \| Top of range
Disclosure of detailed information about financial instruments [line items]
Rates	260.00%	260.00%
Net investment hedges \| Interest rate caps of £ LIBOR debt
Disclosure of detailed information about financial instruments [line items]
Notional	2,301	3,198
Fair value of financial assets	$ 0	$ 0
Net investment hedges \| Interest rate caps of £ LIBOR debt \| Bottom of range
Disclosure of detailed information about financial instruments [line items]
Rates	1.00%	2.00%
Net investment hedges \| Interest rate caps of £ LIBOR debt \| Top of range
Disclosure of detailed information about financial instruments [line items]
Rates	250.00%	250.00%
Net investment hedges \| Interest rate caps of £ SONIA debt
Disclosure of detailed information about financial instruments [line items]
Notional	974
Rates	2.00%
Fair value of financial assets	$ 5
Net investment hedges \| Interest rate caps of € EURIBOR debt
Disclosure of detailed information about financial instruments [line items]
Notional	102	119
Rates	1.30%	1.30%
Fair value of financial assets	$ 0	$ 0
Net investment hedges \| Interest rate caps of C$ LIBOR debt
Disclosure of detailed information about financial instruments [line items]
Notional	240	189
Rates	2.00%	3.00%
Fair value of financial assets	$ 0	$ 0
Net investment hedges \| Interest rate swaps of AUD BBSW/BBSY debt
Disclosure of detailed information about financial instruments [line items]
Notional	422	447
Fair value of financial assets	$ 0
Fair value of financial liabilities		$ (11)
Net investment hedges \| Interest rate swaps of AUD BBSW/BBSY debt \| Bottom of range
Disclosure of detailed information about financial instruments [line items]
Rates	0.80%	0.80%
Net investment hedges \| Interest rate swaps of AUD BBSW/BBSY debt \| Top of range
Disclosure of detailed information about financial instruments [line items]
Rates	160.00%	160.00%

The average rate of a hedging instrument. [Refer: Hedging instruments [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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- Definition

The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 7
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