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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
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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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
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-IssueDate 2017-01-01
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