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INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Segment Information (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | $ 4,623 | $ 4,591 | $ 5,572
Utilities |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | 111 | 92 |
Transport |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | 2,382 | 2,497 |
Energy |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | 1,178 | 1,183 |
Data Infrastructure |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | 923 | 710 |
Corporate |  |  |
Disclosure of operating segments [line items] |  |  |
Investments accounted for using equity method | $ 29 | $ 109 |

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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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