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PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
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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, 2015 USD ($) shares | Dec. 31, 2015 CAD ($) $ / shares shares | Apr. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) shares | Mar. 31, 2015 CAD ($) $ / shares shares | Dec. 31, 2017 USD ($) day $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Sep. 14, 2016 shares
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.0
Stock split conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.5
Additional unit received for each unit held in stock split |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.5
Partnership units issued, net of issuance costs | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 992 | $ 755 | $ 932 |
Share issue related cost (less than) | $ |  |  |  |  | $ 28 | $ 20 |  |  |  |  | $ 24 |  |  |  |  |  |
Repurchased and cancelled | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 67 |
Share repurchase related cost | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 1 |
Volume weighted average of trading price, number of trading days | day |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Preferred Unitholders Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.0 | 10.0 | 10.0 |
Preferred Unitholders Capital | Series 9 Preferred Units | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares | 8.0 | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs | $ 161 | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost (less than) | $ | $ 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 |  |  | 12.0 | 12.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  | $ 225 | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |
Share issue related cost (less than) | $ |  |  | $ 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 |  |  |  |  |  |  | 10.0 | 10.0 |  |  |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  |  |  | $ 190 | $ 250 |  |  |  |  |  |  |  |  |
Share issue related cost (less than) | $ |  |  |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  |  |  | 5.35% | 5.35% |  |  |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 3 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  | 5.0 | 5.0 |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  |  |  |  |  | $ 95 | $ 125 |  |  |  |  |  |  |
Share issue related cost (less than) | $ |  |  |  |  |  |  |  |  | $ 2 |  |  |  |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  |  |  |  |  | 5.50% | 5.50% |  |  |  |  |  |  |
Preferred Unitholders Capital | Series 1 Preferred Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  |  | 5.0 | 5.0 |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |
Partnership units issued, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 100 | $ 125 |  |  |  |
Share issue related cost (less than) | $ |  |  |  |  |  |  |  |  |  |  |  | $ 4 |  |  |  |  |
Quarterly fixed distribution rate |  |  |  |  |  |  |  |  |  |  |  | 4.50% | 4.50% |  |  |  |
Special General Partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership distributions | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 113 | $ 80 | $ 64 |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 | 1.6 | 1.6 |
Special General Partner | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Repurchased and cancelled | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0 |
Repurchased and cancelled | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |
Limited Partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in equity | $ |  |  |  |  | $ 6 | $ 16 |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6 | $ 67 |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 264.6 | 244.7 | 238.9 |
Limited Partners | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  | 16.6 | 15.6 |  |  |  |  | 20.0 |  |  | 17.2 | 16.4 | 20.2 |
Number of share issued, price per share | $ / shares |  |  |  |  | $ 42 | $ 32 |  |  |  |  | $ 30 |  |  |  | $ 32 |  |
Partnership units issued, net of issuance costs | $ |  |  |  |  | $ 700 | $ 500 |  |  |  |  | $ 600 |  |  |  |  |  |
Repurchased and cancelled | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 2.5 |
Repurchased and cancelled | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 6 | $ 67 |
Dividend reinvestment plan, unit issued (less than) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 | 1.0 | 1.0 |
Dividend reinvestment plan, proceeds | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 | $ 25 | $ 6 |
Limited Partners | Partners' capital | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased and cancelled | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 |  |
Special General Partner and Limited Partner | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.2 | 16.4 | 20.2 |
Repurchased and cancelled | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 0.2 | 2.5 |
Repurchased and cancelled | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 6 | $ 67 |
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield | Partners' capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  | 7.4 | 8.1 |  |  |  |  | 12.2 |  |  | 7.4 | 8.1 | 12.2 |
Partnership units issued, net of issuance costs | $ |  |  |  |  | $ 300 | $ 250 |  |  |  |  | $ 350 |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 110.6 | 100.9 | 96.9 |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.8 |  |  |
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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