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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Sensitivity Analysis For Foreign Currency Risk (Details) - Foreign currency risk - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AUD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) $ 4 $ 4 $ (20)
Impact of 10% increase on Net income (loss) (4) (4) 20
Impact of 10% decrease on Partnership Capital 70 12  
Impact of 10% increase on Partnership Capital (70) (12)  
EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 2 0 (19)
Impact of 10% increase on Net income (loss) (2) 0 19
Impact of 10% decrease on Partnership Capital 14 0  
Impact of 10% increase on Partnership Capital (14) 0  
GBP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 5 7 (11)
Impact of 10% increase on Net income (loss) (5) (7) 11
Impact of 10% decrease on Partnership Capital 105 0  
Impact of 10% increase on Partnership Capital (105) 0  
CLP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (1) 0 (3)
Impact of 10% increase on Net income (loss) 1 0 3
Impact of 10% decrease on Partnership Capital (5) (24)  
Impact of 10% increase on Partnership Capital 5 24  
COP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 1 1 1
Impact of 10% increase on Net income (loss) (1) (1) (1)
Impact of 10% decrease on Partnership Capital 8 2  
Impact of 10% increase on Partnership Capital (8) (2)  
BRL      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 15 18 10
Impact of 10% increase on Net income (loss) (15) (18) (10)
Impact of 10% decrease on Partnership Capital 158 227  
Impact of 10% increase on Partnership Capital (158) (227)  
CAD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 4 1 (2)
Impact of 10% increase on Net income (loss) (4) (1) 2
Impact of 10% decrease on Partnership Capital 1 0  
Impact of 10% increase on Partnership Capital (1) 0  
PEN      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Partnership Capital 10 11  
Impact of 10% increase on Partnership Capital (10) (11)  
INR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (3) (2) (1)
Impact of 10% increase on Net income (loss) 3 2 1
Impact of 10% decrease on Partnership Capital 58 27  
Impact of 10% increase on Partnership Capital (58) (27)  
NZD & Other      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (1) 0 0
Impact of 10% increase on Net income (loss) $ 1 $ 0 $ 0