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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, 2019
Dec. 31, 2018
Dec. 31, 2017
AUD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) $ 4 $ (20) $ (18)
Impact of 10% increase on Net income (loss) (4) 20 18
Impact of 10% decrease on Partnership Capital 12 0 0
Impact of 10% increase on Partnership Capital (12) 0 0
EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 0 (19) (9)
Impact of 10% increase on Net income (loss) 0 19 9
Impact of 10% decrease on Partnership Capital 0 0 0
Impact of 10% increase on Partnership Capital 0 0 0
GBP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 7 (11) (3)
Impact of 10% increase on Net income (loss) (7) 11 3
Impact of 10% decrease on Partnership Capital 0 0 0
Impact of 10% increase on Partnership Capital 0 0 0
CLP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 0 (3) 1
Impact of 10% increase on Net income (loss) 0 3 (1)
Impact of 10% decrease on Partnership Capital (24) (28) 8
Impact of 10% increase on Partnership Capital 24 28 (8)
COP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 1 1 0
Impact of 10% increase on Net income (loss) (1) (1) 0
Impact of 10% decrease on Partnership Capital 2 8 7
Impact of 10% increase on Partnership Capital (2) (8) (7)
BRL      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 18 10 21
Impact of 10% increase on Net income (loss) (18) (10) (21)
Impact of 10% decrease on Partnership Capital 227 231 334
Impact of 10% increase on Partnership Capital (227) (231) (334)
CAD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 1 (2) (1)
Impact of 10% increase on Net income (loss) (1) 2 1
Impact of 10% decrease on Partnership Capital 0 0 0
Impact of 10% increase on Partnership Capital 0 0 0
PEN      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 0 0 0
Impact of 10% increase on Net income (loss) 0 0 0
Impact of 10% decrease on Partnership Capital 11 11 12
Impact of 10% increase on Partnership Capital (11) (11) (12)
INR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (2) (1) 0
Impact of 10% increase on Net income (loss) 2 1 0
Impact of 10% decrease on Partnership Capital 27 10 4
Impact of 10% increase on Partnership Capital (27) (10) (4)
NZD & Other      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 0 0 0
Impact of 10% increase on Net income (loss) 0 0 0
Impact of 10% decrease on Partnership Capital 0 0 0
Impact of 10% increase on Partnership Capital $ 0 $ 0 $ 0