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PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
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Sep. 12, 2018 USD ($) shares | Sep. 12, 2018 CAD ($) $ / shares shares | Jan. 23, 2018 USD ($) shares | Jan. 23, 2018 CAD ($) $ / shares shares | Jan. 26, 2017 USD ($) shares | Jan. 26, 2017 CAD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Aug. 31, 2016 USD ($) shares | Aug. 31, 2016 CAD ($) $ / shares shares | Dec. 31, 2018 USD ($) day $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 14, 2016 shares
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock split conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5
Additional unit received for each unit held in stock split |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5
Number of shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 115,000,000
Repurchased and cancelled |  |  |  |  |  |  |  |  |  |  | $ 31 |  | $ 6 |
Share repurchase related cost |  |  |  |  |  |  |  |  |  |  | 1 | $ 0 | 1 |
Partnership units issued, net of issuance costs |  |  |  |  |  |  |  |  |  |  | $ 14 | 992 | 755 |
Share issue related cost |  |  |  |  |  |  | $ 28 | $ 20 |  |  |  |  |  |
Volume weighted average of trading price, number of trading days | day |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 588 | 1,212 | $ 941 |
Exchange LP unit conversion, value |  |  |  |  |  |  |  |  |  |  | (232) | $ 0 |  |
Preferred Unit Repurchase Related Cost |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  | 18,000,000 | 12,000,000 | 10,000,000 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 342 | $ 220 | $ 186 |
Preferred Units, Units Repurchased | shares |  |  |  |  |  |  |  |  |  |  | 100,000 | 0 | 0 |
Repurchase of Preferred Equity |  |  |  |  |  |  |  |  |  |  | $ (1) | $ 0 | $ 0 |
Preferred Unitholders Capital | Series 11 Preferred Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares | 10,000,000 | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs | $ 190 | $ 250 |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate | 5.10% | 5.10% |  |  |  |  |  |  |  |  |  |  |  |
Underwriting related cost | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 9 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  | 8,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  | $ 161 | $ 200 |  |  |  |  |  |  |  |  |  |
Share issue related cost |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |
Underwriting related cost |  |  | $ 4 |  |  |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 7 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  | 12,000,000 | 12,000,000 |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  | $ 225 | $ 300 |  |  |  |  |  |  |  |
Share issue related cost |  |  |  |  | $ 1 |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |
Underwriting related cost |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 5 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  |  |  |  |  | $ 190 | $ 250 |  |  |  |
Share issue related cost |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  |  |  |  |  | 5.35% | 5.35% |  |  |  |
Special General Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership distributions |  |  |  |  |  |  |  |  |  |  | $ 136 | $ 113 | $ 80 |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 1,600,000 | 1,600,000 | 1,600,000 |
Special General Partner | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled, units | shares |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Limited Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  |  | $ 30 |  | $ 6 |
Increase in equity |  |  |  |  |  |  | $ 6 | $ 16 |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 276,900,000 | 264,600,000 | 244,700,000 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 692 | $ 505 |
Limited Partners | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled, units | shares |  |  |  |  |  |  |  |  |  |  | 900,000 | 0 | 200,000 |
Repurchased and cancelled |  |  |  |  |  |  |  |  |  |  | $ 30 | $ 0 | $ 6 |
Issued for cash | shares |  |  |  |  |  |  | 16,600,000 | 15,600,000 |  |  | 300,000 | 17,200,000 | 16,400,000 |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  | $ 42 | $ 32 |  |  |  |  | $ 32 |
Partnership units issued, net of issuance costs |  |  |  |  |  |  | $ 700 | $ 500 |  |  |  |  |  |
Dividend reinvestment plan, unit issued (less than) | shares |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000 | 1,000,000 |
Dividend reinvestment plan, proceeds |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 20 | $ 25 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 14 | 692 | 505 |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  |  | $ 300 | $ 250 |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  | 7,400,000 | 8,100,000 |  |  | 0 | 7,400,000 | 8,100,000 |
Partnership units issued, net of issuance costs |  |  |  |  |  |  | $ 300 | $ 250 |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  | 115,800,000 | 110,600,000 | 100,900,000 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 300 | $ 250 |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital | Holding LP and other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  |  |  |  |  | 115,800,000 |  |  |
Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 232 |  |  |
Non-controlling Interest - Exchange LP Units, equity [Member] | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  | 5,700,000 | 0 | 0 |
Unit issuance (note 26) |  |  |  |  |  |  |  |  |  |  | $ 232 | $ 0 | $ 0 |
Exchange LP unit conversion, shares | shares |  |  |  |  |  |  |  |  |  |  | (1,300,000) | 0 | 0 |
Exchange LP unit conversion, value |  |  |  |  |  |  |  |  |  |  | $ 20 | $ 0 | $ 0 |
Incentive Distribution, $0.203 Threshold | Special General Partner | Holding LP and other | 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 |  |  |
Distribution rights entitle as percent, threshold |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Incentive Distribution, $0.22 Threshold | Special General Partner | Holding LP and other | 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 |  |  |
Distribution rights entitle as percent, threshold |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |

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