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INVESTMENTS - Equity Accounting Method Investment Continuity (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | $ 1,213 |
Equity pick-up (loss) from equity investees |  | (46) | $ (76)
Impairment charges (reversals) (note 10) |  | 900 | (212)
Investments, ending balance |  | 1,234 | 1,213
Joint ventures |  |  |
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | 1,213 | 1,185
Equity pick-up (loss) from equity investees |  | (46) | 76
Funds invested |  | (5) | 12
Impairment charges (reversals) (note 10) |  | (30) |
Funds invested |  |  | 60
Investments, ending balance |  | 1,234 | 1,213
Kabanga |  |  |
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | 30 | 30
Equity pick-up (loss) from equity investees |  | 0 | (1)
Funds invested |  | 0 | 1
Impairment charges (reversals) (note 10) | $ 30 | (30) |
Funds invested |  |  | 0
Investments, ending balance |  | 0 | 30
Jabal Sayid |  |  |
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | 206 | 180
Equity pick-up (loss) from equity investees |  | (39) | 26
Funds invested |  | 0 | 0
Impairment charges (reversals) (note 10) |  | 0 |
Funds invested |  |  | 0
Investments, ending balance |  | 245 | 206
Zaldívar |  |  |
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | 975 | 974
Equity pick-up (loss) from equity investees |  | (14) | 61
Funds invested |  | 0 | 0
Impairment charges (reversals) (note 10) |  | 0 |
Funds invested |  |  | 60
Investments, ending balance |  | 989 | 975
GNX |  |  |
Disclosure of joint ventures [line items] |  |  |
Investments, beginning balance |  | 2 | 1
Equity pick-up (loss) from equity investees |  | 7 | (10)
Funds invested |  | (5) | 11
Impairment charges (reversals) (note 10) |  | 0 |
Funds invested |  |  | 0
Investments, ending balance |  | $ 0 | $ 2

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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 -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph ba -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_ba&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_24_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_g&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2018-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2018-03-02&anchor=para_39M_b&doctype=Standard&book=b -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_c&doctype=Standard -URIDate 2018-03-16 + Details
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