INVESTMENT PROPERTIES - Schedule of Changes in Fair Value of Investment Properties (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Reconciliation of changes in investment property [abstract]
Fair value, beginning of year	$ 56,870	$ 54,172
Additions	3,069	593
Acquisitions through business combinations, investment property	33,024	5,851
Dispositions	(8,555)	(6,169)
Fair value changes	1,610	1,021
Foreign currency translation	(1,709)	1,402
Fair value, end of year	$ 84,309	$ 56,870

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

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The gains (losses) from changes in the fair value of investment property. [Refer: Investment property]

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The increase (decrease) in investment property resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Investment property]

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Expiry date 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. Effective 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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