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EQUITY ACCOUNTED INVESTMENTS - Schedule Of Investments in Associates and Joint Ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments $ 40,698 $ 33,647 $ 31,994
Proportion of ownership interest in joint venture 50.00% 50.00%  
Investment Accounted For Using Equity Method, Additions, Net Of Disposals $ 4,700 $ (9,772)  
Oaktree [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 5,231 0  
Equity accounted investments $ 5,231 0  
Proportion of ownership interest in joint venture 61.00%    
Investment Accounted For Using Equity Method, Additions, Net Of Disposals $ 5,251    
Real Estate and Infrastructure [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate or joint venture 50.00%    
Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments $ 22,314 22,949  
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (1,932)    
Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 0 107  
Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 307 1,173  
Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments 1,154 685  
Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investments in Joint Ventures and Associates Accounted for Using the Equity Method 431 434  
Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments 8,972 7,636  
Investment Accounted For Using Equity Method, Additions, Net Of Disposals $ 1,067    
Infrastructure | Data Infrastructure [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 45.00%    
Carrying Value, associate $ 2,920 $ 1,705  
Proportion of ownership interest in joint venture   45.00%  
Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 962 $ 339  
Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 4,033 4,100  
Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 156 232  
Private Equity      
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments 2,596 1,943  
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (150)    
Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 557 583  
Private Equity | Norbord      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate $ 1,185 $ 1,287  
Proportion of ownership interest in joint venture 43.00% 42.00%  
Private Equity | Industrial operations [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate $ 854 $ 73  
Renewable Power and Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Equity accounted investments 1,585 $ 1,119  
Investment Accounted For Using Equity Method, Additions, Net Of Disposals $ 440    
Bottom of range | Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate   7.00%  
Bottom of range | Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 3.00% 6.00%  
Bottom of range | Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 14.00% 14.00%  
Bottom of range | Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 11.00% 11.00%  
Bottom of range | Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 26.00% 26.00%  
Bottom of range | Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 22.00% 22.00%  
Bottom of range | Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 25.00% 13.00%  
Top of range | Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate   23.00%  
Top of range | Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 90.00% 90.00%  
Top of range | Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 60.00% 60.00%  
Top of range | Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 50.00% 50.00%  
Top of range | Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 58.00% 58.00%  
Top of range | Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 50.00% 50.00%  
Top of range | Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate 90.00% 90.00%  
Core office | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 9,440 $ 8,258  
Core office | Bottom of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 14.00% 15.00%  
Core office | Top of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 56.00% 56.00%  
LP Investments and Other [Member] | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 2,012 $ 2,252  
LP Investments and Other [Member] | Bottom of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 18.00% 12.00%  
LP Investments and Other [Member] | Top of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 80.00% 90.00%  
Core retail | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 10,555 $ 11,159  
Core retail | Bottom of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 12.00% 12.00%  
Core retail | Top of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 68.00% 68.00%  
Aggregated individually immaterial joint ventures [member] | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 383 $ 395  
Other | Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 185 $ 139  
Proportion of ownership interest in joint venture 50.00% 50.00%  
Energy [Member] | Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 716 $ 1,121  
Aggregated individually immaterial associates [member] | Bottom of range      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate or joint venture 16.00% 18.00%  
Aggregated individually immaterial associates [member] | Top of range      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in associate or joint venture 85.00% 85.00%