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HELD FOR SALE - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Real Estate  
Disclosure of financial assets [line items]  
Number of properties 11
Toronto office property | Real Estate  
Disclosure of financial assets [line items]  
Gross proceeds from assets sold $ 660
Chilean electricity transmission operations | Infrastructure  
Disclosure of financial assets [line items]  
Gross proceeds from assets sold $ 1,300