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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, 2017
Dec. 31, 2016
Dec. 31, 2015
AUD      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) $ (18) $ (2) $ 8
Impact of 10% increase on Net income (loss) 18 2 (8)
Impact of 10% decrease on Partnership Capital 0 0 24
Impact of 10% increase on Partnership Capital 0 0 (24)
EUR      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (9) (8) 5
Impact of 10% increase on Net income (loss) 9 8 (5)
Impact of 10% decrease on Partnership Capital 0 35 18
Impact of 10% increase on Partnership Capital 0 (35) (18)
GBP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) (3) (6) 5
Impact of 10% increase on Net income (loss) 3 6 (5)
Impact of 10% decrease on Partnership Capital 0 0 23
Impact of 10% increase on Partnership Capital 0 0 (23)
COP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Partnership Capital 7 6 6
Impact of 10% increase on Partnership Capital (7) (6) (6)
BRL      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 21 14 0
Impact of 10% increase on Net income (loss) (21) (14) 0
Impact of 10% decrease on Partnership Capital 334 172 89
Impact of 10% increase on Partnership Capital (334) (172) (89)
CLP      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Impact of 10% decrease on Net income (loss) 1 0 1
Impact of 10% increase on Net income (loss) (1) 0 (1)
Impact of 10% decrease on Partnership Capital 8 10 13
Impact of 10% increase on Partnership Capital (8) (10) (13)
CAD      
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 0 0 11
Impact of 10% increase on Partnership Capital 0 0 (11)
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 12 11 0
Impact of 10% increase on Partnership Capital (12) (11) 0
INR      
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 4 4 0
Impact of 10% increase on Partnership Capital $ (4) $ (4) $ 0