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PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2021 USD ($) $ / shares shares | Sep. 21, 2020 USD ($) $ / shares shares | Oct. 16, 2018 USD ($) shares | Sep. 12, 2018 USD ($) shares | Sep. 12, 2018 CAD ($) $ / shares shares | Jan. 23, 2018 USD ($) shares | Jan. 23, 2018 CAD ($) $ / shares shares | Jul. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) day $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Mar. 31, 2020 shares
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  | $ 781,000,000 |  | $ (16,000,000) |  |
Repurchased and cancelled | [1] |  |  |  |  |  |  |  |  |  |  | 29,000,000 |  | 31,000,000 |  |
Volume weighted average of trading price, number of trading days | day |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Exchangeable shares issued as a result of special distribution | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.3
Unit issuance | [1] |  |  |  |  |  |  |  |  | $ 9,000,000 |  | $ 809,000,000 |  | $ 588,000,000 |  |
Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  |  |  |  |  | 8.0 |  | 0.0 |  | 18.0 |  |
Repurchased and cancelled | [1] |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  |
Unit issuance |  |  |  |  |  |  |  |  |  | $ 195,000,000 |  | $ 0 | [1] | $ 342,000,000 | [1] |
Repurchased and cancelled (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.1 |  |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  | $ 0 |  | $ (1,000,000) |  | $ (1,000,000) |  |
Preferred Unitholders Capital | Series 14 Preferred Units | Major ordinary share transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting related cost |  | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 13 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  | 5.125% |  |  |  |  |  |  |  |  |  |  |  |  |
Underwriting related cost |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 11 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  | 10.0 | 10.0 |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  |  | $ 190,000,000 | $ 250 |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  | 5.10% | 5.10% |  |  |  |  |  |  |  |  |  |
Underwriting related cost |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 9 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  |  | 8.0 | 8.0 |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  |  |  |  | $ 161,000,000 | $ 200 |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |
Underwriting related cost |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |
Special General Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership distributions |  |  |  |  |  |  |  |  |  | $ 183,000,000 |  | $ 158,000,000 |  | $ 136,000,000 |  |
Special General Partner | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0 |  |
Repurchased and cancelled (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 0.0 |  |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  | 1.6 |  | 1.6 |  | 1.6 |  |
Unit issuance |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 0 |  |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in equity |  |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  |  |
Unit issuance | [1] |  |  |  |  |  |  |  |  | $ 0 |  | $ 250,000,000 |  |  |  |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  |  |  |  | 6.1 | 0.0 |  | 6.1 |  | 0.0 |  |
Partnership units issued, net of costs and repurchases |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  | 122.0 |  | 118.6 |  | 115.8 |  |
Unit issuance |  |  |  |  |  |  |  |  |  | $ 0 | [1] | $ 250,000,000 | [1] | $ 0 |  |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital | Holding LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) | shares |  |  |  |  |  |  |  |  |  | 122.0 |  |  |  |  |  |
Limited Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled | [1] |  |  |  |  |  |  |  |  |  |  | $ 28,000,000 |  | $ 30,000,000 |  |
Limited partners (in dollars per unit) | $ / shares | [2] |  |  |  |  |  |  |  |  | $ 0.35 |  | $ 0.06 |  | $ 0.53 |  |
Unit issuance | [1] |  |  |  |  |  |  |  |  | $ 9,000,000 |  | $ 559,000,000 |  | $ 14,000,000 |  |
Limited Partners | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  |  |  |  |  |  | 13.5 | 0.2 |  | 13.8 |  | 0.3 |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  |  | $ 42.50 |  |  |  |  |  |  |
Partnership units issued, net of costs and repurchases |  |  |  |  |  |  |  |  | $ 575,000,000 |  |  |  |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |
Repurchased and cancelled (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.0 |  | 0.8 |  | 0.9 |  |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 28,000,000 | [1] | $ 30,000,000 | [1] |
Share repurchase related cost |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  | $ 1,000,000 |  | $ 1,000,000 |  |
Dividend reinvestment plan, unit issued (less than) | shares |  |  |  |  |  |  |  |  |  | 1.0 |  | 1.0 |  | 1.0 |  |
Dividend reinvestment plan, proceeds |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  | $ 8,000,000 |  | $ 14,000,000 |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  | 294.7 |  | 285.6 |  | 276.9 |  |
Unit issuance | [1] |  |  |  |  |  |  |  |  | $ 9,000,000 |  | $ 559,000,000 |  | $ 14,000,000 |  |
Non-controlling interest— Exchange LP Units | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash (in shares) | shares |  |  |  | 5.7 |  |  |  |  |  | 0.1 |  | 0.0 |  | 5.7 |  |
Unit issuance |  |  |  | $ 232,000,000 |  |  |  |  |  | $ 0 |  | $ 0 |  | $ 232,000,000 |  |
Exchange LP conversion (in shares) | shares |  |  |  |  |  |  |  |  |  | 0.3 |  | 3.2 |  | 1.3 |  |
Exchange LP unit conversion, value |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  | $ 53,000,000 |  | $ 20,000,000 |  |
Incentive Distribution, $0.1827 Threshold | Special General Partner | Holding LP | Holding LP’s units (other than Holding LP Class A Preferred Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions threshold, per quarter, per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.1827 |  |  |  |  |  |
Distribution rights entitle as percent, threshold |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |
Incentive Distribution, $0.198 Threshold | Special General Partner | Holding LP | Holding LP’s units (other than Holding LP Class A Preferred Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions threshold, per quarter, per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.198 |  |  |  |  |  |
Distribution rights entitle as percent, threshold |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Incentive Distribution, $0.203 Threshold | Special General Partner | Holding LP | Holding LP’s units (other than Holding LP Class A Preferred Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions threshold, per quarter, per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.203 |  |  |  |
Incentive Distribution, $0.22 Threshold | Special General Partner | Holding LP | Holding LP’s units (other than Holding LP Class A Preferred Units) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions threshold, per quarter, per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.22 |  |  |  |
[1] | Refer to Note 26, Partnership Capital.
[2] | Basic and diluted income per limited partner unit for the years ended December 31, 2020, 2019, and 2018 have been restated to reflect the impact of the special distribution on March 31, 2020. Refer to Note 1, Organization and Description of the Business, for further details.

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