INVESTMENT PROPERTIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 07, 2018
Disclosure of detailed information about investment property [line items]
Additions and acquisitions through business combination, investment properties	$ 36,100
Dispositions	(8,555)	$ (6,169)
Rental income from investment property	5,400	4,400
Direct operating expense from investment property	2,100	1,600
Acquisitions through business combinations, investment property	33,024	$ 5,851
GGP Inc. (“GGP”)
Disclosure of detailed information about investment property [line items]
Acquisitions through business combinations, investment property	$ 18,000
Forest City [Member]
Disclosure of detailed information about investment property [line items]
Investment properties			$ 9,397

Additions and acquisitions through business combination, investment properties

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- Definition

Investment Property Recognised As Of Acquisition Date

+ References

No definition available.

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- Definition

The increase in investment property resulting from acquisitions through business combinations. [Refer: Business combinations [member]; 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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- 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

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