INVESTMENT PROPERTIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about investment property [line items]
Business combinations	$ 5,851	$ 9,234
Disposals, investment property	6,200
Rental income from investment property	4,400	4,100
Direct operating expense from investment property	$ 1,600	1,600
New York
Disclosure of detailed information about investment property [line items]
Portion of an investment property sold	49.00%
Toronto
Disclosure of detailed information about investment property [line items]
Proportion of investment property that has been reclassified to assets held for sale	50.00%
Aggregated individually immaterial business combinations
Disclosure of detailed information about investment property [line items]
Business combinations	$ 6,400	$ 10,800

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- Definition

Portion of an Investment Property that has been Reclassified to Assets Held for Sale

+ References

No definition available.

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- Definition

The amount of additions to investment property resulting from acquisitions. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of direct operating expenses (including repairs and maintenance) arising from investment property. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 40
-IssueDate 2017-01-01
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The decrease in investment property resulting from disposals. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of rental income arising from investment property recognised in profit or loss. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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