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RELATED PARTY TRANSACTIONS (Details)
shares in Millions
 12 Months Ended
Mar. 30, 2020
USD ($)
agreement
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 29, 2020
USD ($)
shares
Disclosure of transactions between related parties [line items]          
Asset management fee as percent per quarter   0.3125%      
Asset management fee, percent   1.25%      
Credit facility, maximum borrowing capacity   $ 1,000,000,000      
Payables to related parties   $ 1,143,000,000 $ 0    
Borrowings, maturity   ten years      
Amounts payable, related party transactions, interest rate   5.00%      
Interest expense, related party transactions   $ 39,000,000 0    
Amounts payable, related party transactions   2,000,000 0    
Amounts receivable, related party transactions   7,000,000 0    
Brookfield secondary offering, shares issued (in shares) | shares         5.0
Brookfield secondary offering, proceeds         $ 305,000,000
Percentage of issued and outstanding exchangeable shares held by Brookfield 29.60%       19.30%
Senior Unsecured Revolving Credit Facility          
Disclosure of transactions between related parties [line items]          
Number of credit agreements | agreement 2        
Borrowings maturity, term 10 years        
Credit facility, maximum borrowing capacity $ 1,000,000,000        
Brookfield Infrastructure          
Disclosure of transactions between related parties [line items]          
Subsidiary and corporate borrowings   $ 0      
Service Provider          
Disclosure of transactions between related parties [line items]          
Asset management fee as percent per quarter   0.3125%      
Asset management fee, percent   1.25%      
Services received, related party transactions   $ 30,000,000 30,000,000 $ 24,000,000  
Subsidiary of Common Parent (Brookfield) | Brookfield Office Properties Inc.          
Disclosure of transactions between related parties [line items]          
Services received, related party transactions   0 0 0  
Revenue from rendering of services, related party transactions   $ 500,000 $ 2,000,000 $ 4,000,000