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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Foreign Exchange Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 8,829	$ 8,904
Foreign exchange contracts
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	3,816	4,488
Foreign exchange contracts | Australian dollars
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 1,214	$ 2,133
Average Exchange Rate	74.00%	73.00%
Foreign exchange contracts | British pounds
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 2,069	$ 1,810
Average Exchange Rate	130.00%	130.00%
Foreign exchange contracts | European Union euros
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 491	$ 374
Average Exchange Rate	117.00%	114.00%
Foreign exchange contracts | Brazilian reais
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 0	$ 144
Average Exchange Rate	0.00%	337.00%
Foreign exchange contracts | Canadian dollars
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items]
Notional Amount (U.S. Dollars)	$ 42	$ 27
Average Exchange Rate	77.00%	76.00%

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 23B
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_23B_b&doctype=Standard
-URIDate 2017-03-09

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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