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INVESTMENT IN ASSOCIATES AND JOINT VENTURES INVESTMENT IN ASSOCIATES AND JOINT VENTURES (Geographic Information) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Mar. 15, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | $ 4,407 |  | $ 5,572 | $ 4,727
Brazilian toll roads |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 1,467 |  | 1,715 |
North American natural gas transmission operation |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 1,034 |  | 1,013 |
European Telecommunications Infrastructure Operations [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 638 |  | 614 |
Brazillian Rail Business [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 375 |  | 436 |
Australian Ports Operation [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 176 |  | 191 |
Chilean electricity transmission operation [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | 0 | $ 951 | 930 |
Aggregated Individually Immaterial Associates And Joint Ventures [Member] |  |  |  |
Disclosure of geographical areas [line items] |  |  |  |
Investments accounted for using equity method | $ 717 |  | $ 673 |

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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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