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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, 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

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