FINANCIAL ASSETS AND LIABILITIES - Reconciliation of movements relating to financial instruments (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
The reconciliation of movements relating to financial instruments
Financial liabilities	$ 10,571	$ 11,630
Transfers of financial assets from level 1 to 2	0
Transfers of financial assets from level 2 to 1	0
Transfers of financial assets into 3	0
Transfers of financial assets from 3	0
Transfers of financial liabilities from level 1 to 2	0
Transfers of financial liabilities from level 2 to 1	0
Transfers of financial liabilities into 3	0
Transfers of financial liabilities from 3	0
Level 3 \| Financial instruments at fair value
The reconciliation of movements relating to financial instruments
Financial liabilities	49	49
Contingent consideration \| Level 3 \| Financial instruments at fair value
The reconciliation of movements relating to financial instruments
Financial liabilities	$ 49	$ 49

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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