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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Ownership and Voting Interest (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Associates And Joint Ventures [Line Items]
Investments accounted for using equity method	$ 5,572	$ 4,727	$ 2,973
Brazillian toll road
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	45.00%	49.00%
Investments accounted for using equity method	$ 1,715	$ 1,505
North American natural gas transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	50.00%	50.00%
Investments accounted for using equity method	$ 1,013	$ 806
Chilean electricity transmission operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	28.00%	28.00%
Investments accounted for using equity method	$ 930	$ 699
European telecommunications infrastructure operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	21.00%	21.00%
Investments accounted for using equity method	$ 614	$ 536
Brazilian rail business
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	11.00%	11.00%
Investments accounted for using equity method	$ 436	$ 376
Australian port operation
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	13.00%	13.00%
Investments accounted for using equity method	$ 191	$ 181
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Investments accounted for using equity method	$ 673	$ 624
Other | Bottom of range
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	11.00%	11.00%
Other | Top of range
Disclosure Of Associates And Joint Ventures [Line Items]
Ownership and Voting Interest	50.00%	50.00%

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[Line Items] for Disclosure Of Associates And Joint Ventures [Table]

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Ownership and Voting Interest Held In Associate And Joint Venture

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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]]

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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

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