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DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedging instruments [line items] |  |
Total Notional Amount | $ 9,966 | $ 8,829
Elected for hedge accounting |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total Notional Amount | 7,738 | 6,396
Effective Portion | 88 | (182)
Ineffective Portion | 8 | 0
Cash flow hedges | Elected for hedge accounting |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total Notional Amount | 6,024 | 4,027
Effective Portion | (101) | 15
Ineffective Portion | (1) | 0
Net investment hedges | Elected for hedge accounting |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Total Notional Amount | 1,714 | 2,369
Effective Portion | 189 | (197)
Ineffective Portion | $ 9 | $ 0

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- Definition Gains (losses) on hedging instrument, effective portion + References No definition available. + Details
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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. + Details
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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 + Details
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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 + Details
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