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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
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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)

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