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DISTRIBUTIONS - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 01, 2020 $ / shares | Jun. 30, 2020 $ / shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Partnership distributions (usd per share) | $ 0.5375 |  |  |  |  |
Exchangeable shares issued as a result of special distribution | shares | 46.3 |  |  |  |  |
Class A Preference Limited Partnership Units, Series 1 |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Quarterly distribution rate (as a percent) |  |  |  |  | 3.974% | 4.50%
Quarterly distribution (usd per share) |  |  |  |  | $ 0.2484 | $ 0.2813
Special General Partner |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |
Dividends recognised as incentive distributions to owners | $ |  | $ 183 | $ 158 | $ 136 |  |

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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_107&doctype=Standard -URIDate 2020-01-01 + Details
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