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DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	$ 8,829	$ 8,904
Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	6,396	6,645
Effective Portion	(182)	83
Ineffective Portion	0	1
Cash flow hedges | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	4,027	3,509
Effective Portion	15	30
Ineffective Portion	0	1
Net investment hedges | Elected for hedge accounting
Disclosure of detailed information about hedging instruments [line items]
Total Notional Amount	2,369	3,136
Effective Portion	(197)	53
Ineffective Portion	$ 0	$ 0

X

- Definition

Gains (losses) on hedging instrument, effective portion

+ References

No definition available.

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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

The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 24C
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard
-URIDate 2017-03-09

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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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