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FINANCIAL RISK MANAGEMENT - Maximum Exposure Credit Risk (Details) - Credit risk - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	$ 2,475	$ 2,639
Cash and equivalents
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	2,234	2,389
Accounts receivable
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	239	249
Derivatives
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	$ 2	$ 1

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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