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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
AUD |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | $ 4 | $ 4 | $ (20)
Impact of 10% increase on Net income (loss) | (4) | (4) | 20
Impact of 10% decrease on Partnership Capital | 70 | 12 |
Impact of 10% increase on Partnership Capital | (70) | (12) |
EUR |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | 2 | 0 | (19)
Impact of 10% increase on Net income (loss) | (2) | 0 | 19
Impact of 10% decrease on Partnership Capital | 14 | 0 |
Impact of 10% increase on Partnership Capital | (14) | 0 |
GBP |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | 5 | 7 | (11)
Impact of 10% increase on Net income (loss) | (5) | (7) | 11
Impact of 10% decrease on Partnership Capital | 105 | 0 |
Impact of 10% increase on Partnership Capital | (105) | 0 |
CLP |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | (1) | 0 | (3)
Impact of 10% increase on Net income (loss) | 1 | 0 | 3
Impact of 10% decrease on Partnership Capital | (5) | (24) |
Impact of 10% increase on Partnership Capital | 5 | 24 |
COP |  |  |
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 | 8 | 2 |
Impact of 10% increase on Partnership Capital | (8) | (2) |
BRL |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | 15 | 18 | 10
Impact of 10% increase on Net income (loss) | (15) | (18) | (10)
Impact of 10% decrease on Partnership Capital | 158 | 227 |
Impact of 10% increase on Partnership Capital | (158) | (227) |
CAD |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | 4 | 1 | (2)
Impact of 10% increase on Net income (loss) | (4) | (1) | 2
Impact of 10% decrease on Partnership Capital | 1 | 0 |
Impact of 10% increase on Partnership Capital | (1) | 0 |
PEN |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Partnership Capital | 10 | 11 |
Impact of 10% increase on Partnership Capital | (10) | (11) |
INR |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Impact of 10% decrease on Net income (loss) | (3) | (2) | (1)
Impact of 10% increase on Net income (loss) | 3 | 2 | 1
Impact of 10% decrease on Partnership Capital | 58 | 27 |
Impact of 10% increase on Partnership Capital | (58) | (27) |
NZD & Other |  |  |
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

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