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ACQUISITION OF GGP INC. - Narratives (Details)
$ / shares in Units, $ in Millions
4 Months Ended 12 Months Ended
Aug. 28, 2018
USD ($)
shares
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure of detailed information about business combination [line items]          
Stock conversion ratio     1    
Equity accounted investments   $ (22,698) $ (20,764) $ (22,698) $ (19,761)
GGP          
Disclosure of detailed information about business combination [line items]          
Business acquisition, share conversion price (usd per share) | $ / shares $ 23.50        
Cash transferred $ 200        
Measurement period loss 502        
Share-based compensation 28        
Equity accounted investments 7,843        
Gain recognised in bargain purchase transaction $ 921        
Revenue of acquiree since acquisition date   588      
Profit (loss) of acquiree since acquisition date   $ 360      
Revenue of combined entity as if combination occurred at beginning of period       8,415  
Profit (loss) of combined entity as if combination occurred at beginning of period       $ 4,373  
GGP | Limited partners          
Disclosure of detailed information about business combination [line items]          
Stock conversion ratio 1        
Number of instruments or interests issued or issuable (units) | shares 88,000,000        
Equity interests of acquirer $ 1,786        
GGP | BPR | Class A          
Disclosure of detailed information about business combination [line items]          
Stock conversion ratio 1        
Number of instruments or interests issued or issuable (units) | shares 161,000,000        
Equity interests of acquirer $ 3,383        
BPR          
Disclosure of detailed information about business combination [line items]          
Voting interest 87.00%        
Economic interest 100.00%        
GGP | GGP          
Disclosure of detailed information about business combination [line items]          
Cash transferred $ 9,050