INVESTMENT PROPERTIES - Schedule of Changes in Fair Value of Investment Properties (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about investment property [line items]
Fair value, beginning of year	$ 84,309	$ 56,870
Additions	11,638	3,069
Acquisitions through business combinations, investment property		33,024
Right-of-use assets	2,600
Dispositions	(6,029)	(8,555)
Fair value changes	1,710	1,610
Foreign currency translation and other	461	(1,709)
Fair value, end of year3	96,686	84,309
Investment property [member] \| Increase (decrease) due to changes in accounting policy required by IFRSs [member]
Disclosure of detailed information about investment property [line items]
Right-of-use assets	$ 928	$ 0

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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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.

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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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The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

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