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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, 2018
Dec. 31, 2017
Dec. 31, 2016
AUD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) $ (20) $ (18) $ (2)
Impact of 10% increase on Net income (loss) 20 18 2
Impact of 10% decrease on Partnership Capital 0 0 0
Impact of 10% increase on Partnership Capital 0 0 0
EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (19) (9) (8)
Impact of 10% increase on Net income (loss) 19 9 8
Impact of 10% decrease on Partnership Capital 0 0 35
Impact of 10% increase on Partnership Capital 0 0 (35)
GBP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (11) (3) (6)
Impact of 10% increase on Net income (loss) 11 3 6
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) (3) 1 0
Impact of 10% increase on Net income (loss) 3 (1) 0
Impact of 10% decrease on Partnership Capital (28) 8 10
Impact of 10% increase on Partnership Capital 28 (8) (10)
COP      
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
Impact of 10% decrease on Partnership Capital 8 7 6
Impact of 10% increase on Partnership Capital (8) (7) (6)
BRL      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 10 21 14
Impact of 10% increase on Net income (loss) (10) (21) (14)
Impact of 10% decrease on Partnership Capital 231 334 172
Impact of 10% increase on Partnership Capital (231) (334) (172)
CAD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (2) (1) (1)
Impact of 10% increase on Net income (loss) 2 1 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 12 11
Impact of 10% increase on Partnership Capital (11) (12) (11)
INR      
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
Impact of 10% decrease on Partnership Capital 10 4 4
Impact of 10% increase on Partnership Capital $ (10) $ (4) $ (4)