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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 | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 23, 2018 USD ($) | Jan. 23, 2018 CAD ($) $ / shares | Jan. 26, 2017 USD ($) shares | Jan. 26, 2017 CAD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2018 USD ($) day shares | Jun. 30, 2017 USD ($) shares | Dec. 31, 2017 shares
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Partnership units issued, net of issuance costs | $ |  |  |  |  |  | $ 4 | $ 5 | $ 8 | $ 11 |
Share issue related cost (less than) | $ |  |  |  |  | $ 28 |  |  |  |  |
Volume weighted average of trading price, number of trading days | day |  |  |  |  |  |  |  | 5 |  |
Preferred Unitholders Capital [Member] | Series 9 Preferred Units |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  |  |  |  |  |  | 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 [Member] | Series 7 Preferred Units |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  | 12.0 | 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 | $ |  |  | $ 4 |  |  |  |  |  |  |
Special General Partner |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding |  |  |  |  |  | 1.6 | 1.6 | 1.6 | 1.6 |
Special General Partner | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  |  |  |  |  |  | 0.0 |  | 0.0
Limited Partners 1 [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding |  |  |  |  |  | 276.7 | 259.6 | 276.6 | 259.5 |
Limited Partners 1 [Member] | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  |  |  | 16.6 |  |  | 0.2 |  | 17.2
Number of share issued, price per share | $ / shares |  |  |  |  | $ 42 |  |  |  |  |
Partnership units issued, net of issuance costs | $ |  |  |  |  | $ 700 |  |  |  |  |
Dividend reinvestment plan, unit issued (less than) |  |  |  |  |  |  |  | 1.0 | 1.0 |
Dividend reinvestment plan, proceeds | $ |  |  |  |  |  |  |  | $ 8 | $ 11 |
Special General Partner and Limited Partner | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  |  |  |  |  |  | 0.2 |  | 17.2
Non-controlling Interest - Redeemable Partnership Units [Member] | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash |  |  |  |  | 7.4 |  |  | 0.0 |  | 7.4
Partnership units issued, net of issuance costs | $ |  |  |  |  | $ 300 |  |  |  |  |
Weighted average number of shares outstanding |  |  |  |  |  | 115.8 | 108.4 | 115.8 | 108.4 |

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