EQUITY ACCOUNTED INVESTMENTS - Schedule Of Fair Value Of Equity Accounted Investments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items]
Public Price	$ 9,032	$ 6,423
Carrying Value	10,409	7,453
GGP
Disclosure Of Associates And Joint Ventures [Line Items]
Public Price	7,570	6,379
Carrying Value	8,844	7,453
Norbord
Disclosure Of Associates And Joint Ventures [Line Items]
Public Price	1,176
Other
Disclosure Of Associates And Joint Ventures [Line Items]
Public Price	286	$ 44
Carrying Value	$ 201

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

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- Definition

The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 21
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_b_iii&doctype=Standard
-URIDate 2017-03-09

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- Definition

The amount of investments in associates accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

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