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INVESTMENTS - Equity Accounting Method Investment Continuity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | $ 1,185 |
Equity pick-up (loss) from equity investees | (76) | $ (20)
Impairment reversals (note 10) | (212) | (250)
Investments, ending balance | 1,213 | 1,185
Joint ventures |  |
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | 1,185 | 1,199
Equity pick-up (loss) from equity investees | 76 | 20
Funds invested | 12 | 9
Working capital adjustments |  | 6
Impairment reversals (note 10) |  | (49)
Dividend | (60) |
Investments, ending balance | 1,213 | 1,185
Kabanga |  |
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | 30 | 30
Equity pick-up (loss) from equity investees | (1) | (1)
Funds invested | 1 | 1
Working capital adjustments |  | 0
Impairment reversals (note 10) |  | 0
Dividend | 0 |
Investments, ending balance | 30 | 30
Jabal Sayid |  |
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | 180 | 178
Equity pick-up (loss) from equity investees | 26 | 2
Funds invested | 0 | 0
Working capital adjustments |  | 0
Impairment reversals (note 10) |  | 0
Dividend | 0 |
Investments, ending balance | 206 | 180
Zaldívar |  |
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | 974 | 990
Equity pick-up (loss) from equity investees | 61 | 27
Funds invested | 0 | 0
Working capital adjustments |  | 6
Impairment reversals (note 10) |  | (49)
Dividend | (60) |
Investments, ending balance | 975 | 974
GNX |  |
Disclosure of joint ventures [line items] |  |
Investments, beginning balance | 1 | 1
Equity pick-up (loss) from equity investees | (10) | (8)
Funds invested | 11 | 8
Working capital adjustments |  | 0
Impairment reversals (note 10) |  | 0
Dividend | 0 |
Investments, ending balance | $ 2 | $ 1

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- Definition The amount of impairment loss, impairment gain or reversal of impairment loss that is recognised in profit or loss in accordance with paragraph 5.5.8 of IFRS 9 and that arises from applying the impairment requirements in Section 5.5 of IFRS 9. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 82 -Subparagraph ba -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_ba&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_24_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_e&doctype=Standard -URIDate 2017-03-09 + Details
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