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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance $ 3,277 $ 3,249 $ 5,339
Other comprehensive income (341) 233 (554)
Ending balance (572) 3,277 3,249
Accumulated other comprehensive income(1)      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance [1] 523 278 382
Other comprehensive income [1] 16 245 (104)
Ending balance [1] 539 523 278
Limited Partners | Accumulated other comprehensive income(1)      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance 523 278  
Other comprehensive income 16 245  
Ending balance 539 523 278
Limited Partners | Revaluation Surplus      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance 959 729  
Other comprehensive income 118 230  
Ending balance 1,077 959 729
Limited Partners | Foreign Currency Translation      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance (437) (449)  
Other comprehensive income (105) 12  
Ending balance (542) (437) (449)
Limited Partners | Cash Flow Hedges      
Disclosure of analysis of other comprehensive income by item [line items]      
Beginning balance 1 (2)  
Other comprehensive income 3 3  
Ending balance $ 4 $ 1 $ (2)
[1] Refer to Note 17, Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.