INVESTMENTS IN SUBSIDIARIES - Schedule of Non-Wholly Owned Subsidiaries With Material Non-Controlling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of subsidiaries
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 15,985	$ 18,456
Subsidiaries with material non-controlling interests | Brookfield Office Properties Inc. (“BPO”)
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	0.00%	0.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 4,808	$ 4,757
Subsidiaries with material non-controlling interests | Brookfield Office Properties Inc. (“BPO”) | Bottom of range
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	1.00%
Subsidiaries with material non-controlling interests | Brookfield Office Properties Inc. (“BPO”) | Top of range
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	100.00%
Subsidiaries with material non-controlling interests | BPR Retail Holdings LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	0.00%	0.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 1,787	$ 1,773
Subsidiaries with material non-controlling interests | BSREP CARS Sub-Pooling LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	71.00%	71.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 973	$ 957
Subsidiaries with material non-controlling interests | BSREP II PBSA Ltd.
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	75.00%	75.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 791	$ 687
Subsidiaries with material non-controlling interests | BSREP II MH Holdings LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	74.00%	74.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 773	$ 700
Subsidiaries with material non-controlling interests | Center Parcs UK
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	73.00%	73.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 675	$ 863
Subsidiaries with material non-controlling interests | BSREP II Aries Pooling LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	74.00%	74.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 554	$ 603
Subsidiaries with material non-controlling interests | BSREP II Retail Upper Pooling LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	50.00%	50.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 541	$ 552
Subsidiaries with material non-controlling interests | BSREP II Korea Office Holdings Pte. Ltd.
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	78.00%	78.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 484	$ 766
Subsidiaries with material non-controlling interests | BSREP India Office Holdings Pte. Ltd.
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	67.00%	67.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 403	$ 612
Subsidiaries with material non-controlling interests | BSREP UA Holdings LLC
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	70.00%	70.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 102	$ 507
Subsidiaries with material non-controlling interests | Forest City Realty Trust, Inc.
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	0.00%	85.00%
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 0	$ 3,437
Subsidiaries with material non-controlling interests | Other
Disclosure of subsidiaries
Non-controlling interests: Interests of others in operating subsidiaries and properties	$ 4,094	$ 2,242
Subsidiaries with material non-controlling interests | Other | Bottom of range
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	18.00%	18.00%
Subsidiaries with material non-controlling interests | Other | Top of range
Disclosure of subsidiaries
Proportion of economic interests held by non- controlling interests	76.00%	92.00%