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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance |  | $ 3,277 | $ 3,249 | $ 5,339
Other comprehensive income |  | (341) | 233 | (554)
Ending balance |  | (572) | 3,277 | 3,249
Accumulated other comprehensive income(1) |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance | [1] | 523 | 278 | 382
Other comprehensive income | [1] | 16 | 245 | (104)
Ending balance | [1] | 539 | 523 | 278
Limited Partners | Accumulated other comprehensive income(1) |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance |  | 523 | 278 |
Other comprehensive income |  | 16 | 245 |
Ending balance |  | 539 | 523 | 278
Limited Partners | Revaluation Surplus |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance |  | 959 | 729 |
Other comprehensive income |  | 118 | 230 |
Ending balance |  | 1,077 | 959 | 729
Limited Partners | Foreign Currency Translation |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance |  | (437) | (449) |
Other comprehensive income |  | (105) | 12 |
Ending balance |  | (542) | (437) | (449)
Limited Partners | Cash Flow Hedges |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Beginning balance |  | 1 | (2) |
Other comprehensive income |  | 3 | 3 |
Ending balance |  | $ 4 | $ 1 | $ (2)
[1] | Refer to Note 17, Accumulated Other Comprehensive Income (Loss) for an analysis of accumulated other comprehensive income (loss) by item.

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