INVESTMENT PROPERTIES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Investment property [abstract]
Additions other than through business combinations, investment property	$ 11,638	$ 3,069
Dispositions	(6,029)	(8,555)
Rental income from investment property	5,800	5,400
Direct operating expense from investment property	$ 2,400	2,100
Acquisitions through business combinations, investment property		$ 33,024

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

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The amount of additions to investment property other than those acquired through business combinations. [Refer: Business combinations [member]; Investment property]

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

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

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

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