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EQUITY ACCOUNTED INVESTMENTS - Schedule Of Investments in Associates and Joint Ventures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Associates And Joint Ventures [Line Items]      
Investment Accounted For Using Equity Method, Additions, Net Of Disposals $ (9,800) $ 5,063  
Equity accounted investments 33,647 31,994 $ 24,977
Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (8,068)    
Equity accounted investments 22,949 19,597  
Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 107 $ 123  
Real Estate | Core Retail [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate   34.00%  
Carrying Value, associate   $ 8,845  
Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 1,173 1,563  
Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 685 509  
Equity accounted investments 685 509  
Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investments in Joint Ventures and Associates Accounted for Using the Equity Method 434 708  
Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (811)    
Equity accounted investments $ 7,636 $ 8,793  
Infrastructure | Data Infrastructure [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 45.00% 45.00%  
Carrying Value, associate $ 1,705 $ 1,607  
Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 339 1,279  
Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 4,100 4,639  
Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate 232 162  
Private Equity      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (638)    
Equity accounted investments 1,943 2,387  
Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, associate $ 656 $ 1,023  
Private Equity | Norbord      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 42.00% 40.00%  
Carrying Value, associate $ 1,287 $ 1,364  
Private Equity and Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Investment Accounted For Using Equity Method, Additions, Net Of Disposals (255)    
Equity accounted investments $ 1,119 $ 1,217  
Bottom of range | Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 7.00% 10.00%  
Bottom of range | Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 6.00% 12.00%  
Bottom of range | Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 14.00% 16.00%  
Bottom of range | Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 11.00% 11.00%  
Bottom of range | Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 26.00% 26.00%  
Bottom of range | Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 22.00% 20.00%  
Bottom of range | Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 13.00% 14.00%  
Top of range | Real Estate | Core office      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 23.00% 23.00%  
Top of range | Real Estate | LP Investments and Other [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 90.00% 90.00%  
Top of range | Renewable Power      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 60.00% 50.00%  
Top of range | Infrastructure | Utilities [Member]      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 50.00% 39.00%  
Top of range | Infrastructure | Transport      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 58.00% 58.00%  
Top of range | Infrastructure | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 50.00% 40.00%  
Top of range | Private Equity | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Voting Interest, associate 90.00% 90.00%  
Aggregated individually immaterial joint ventures [member] | Other      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 395 $ 346  
Other | Infrastructure      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 139 $ 93  
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 $ 1,121 $ 1,013  
Proportion of ownership interest in joint venture 50.00% 50.00%  
LP Investments and Other [Member] | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 2,252 $ 954  
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 12.00% 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 90.00% 90.00%  
Core Retail [Member] | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 11,159    
Core Retail [Member] | Bottom of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 12.00%    
Core Retail [Member] | Top of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 68.00%    
Core office | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Carrying Value, joint ventures $ 8,258 $ 8,112  
Core office | Bottom of range | Real Estate      
Disclosure Of Associates And Joint Ventures [Line Items]      
Proportion of ownership interest in joint venture 15.00% 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%  
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 18.00% 12.00%  
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%