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PARTNERSHIP CAPITAL - Additional Information (Details) $ / shares in Units, $ / shares in Units, shares in Millions, $ in Millions, $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jul. 17, 2019 USD ($) $ / shares shares | Sep. 12, 2018 USD ($) shares | Sep. 12, 2018 CAD ($) $ / shares shares | Jan. 23, 2018 USD ($) shares | Jan. 23, 2018 CAD ($) $ / shares shares | Jun. 30, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2019 USD ($) day shares | Jun. 30, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Of Equity |  |  |  |  |  |  |  | $ (29) |  |
Proceeds from issuing shares |  |  |  |  |  | $ 2 | $ 4 | $ 4 | $ 8 |
Volume weighted average of trading price, number of trading days | day |  |  |  |  |  |  |  | 5 |  |
Issue of equity |  |  |  |  |  | $ 2 | $ 4 | $ 4 | $ 8 |
Preferred Unitholders Capital [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Of Equity |  |  |  |  |  |  |  | $ (1) |  |
Issued for cash | shares |  |  |  |  |  |  |  | 0.0 |  | 18.0
Issue of equity |  |  |  |  |  |  |  | $ 0 |  | $ 342
Preferred Units, Units Repurchased | shares |  |  |  |  |  |  |  | 0.1 |  | (0.1)
Repurchase of Preferred Equity |  |  |  |  |  |  |  | $ 1 |  | $ 1
Preferred Unitholders Capital [Member] | Series 11 Preferred Units [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  | 10.0 | 10.0 |  |  |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  | $ 25 |  |  |  |  |  |  |
Proceeds from issuing shares |  | $ 190 | $ 250 |  |  |  |  |  |  |
Quarterly fixed distribution rate |  | 5.10% | 5.10% |  |  |  |  |  |  |
Share underwriting related cost |  | $ 5 |  |  |  |  |  |  |  |
Preferred Unitholders Capital [Member] | Series 9 Preferred Units |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  | 8.0 | 8.0 |  |  |  |  |
Number of share issued, price per share | $ / shares |  |  |  |  | $ 25 |  |  |  |  |
Proceeds from issuing shares |  |  |  | $ 161 | $ 200 |  |  |  |  |
Quarterly fixed distribution rate |  |  |  | 5.00% | 5.00% |  |  |  |  |
Share underwriting related cost |  |  |  | $ 4 |  |  |  |  |  |
Special General Partner | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  | 1.6 | 1.6 | 1.6 | 1.6 |
Partners' Capital Account, Units, Treasury Units Purchased1 | shares |  |  |  |  |  |  |  | 0.0 |  | 0.0
Repurchase Of Equity |  |  |  |  |  |  |  | $ 0 |  | $ 0
Issued for cash | shares |  |  |  |  |  |  |  | 0.0 |  | 0.0
Issue of equity |  |  |  |  |  |  |  | $ 0 |  | $ 0
Limited Partners 1 [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Repurchase Of Equity |  |  |  |  |  |  |  | (28) |  |
Issue of equity |  |  |  |  |  | $ 2 | $ 4 | $ 4 | $ 8 |
Limited Partners 1 [Member] | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  | 279.7 | 276.7 | 278.9 | 276.6 |
Partners' Capital Account, Units, Treasury Units Purchased1 | shares |  |  |  |  |  |  |  | (0.8) |  | (0.9)
Repurchase Of Equity |  |  |  |  |  |  |  | $ (28) |  | $ 30
Share Repurchase Related Cost |  |  |  |  |  |  |  | $ 1 |  |
Issued for cash | shares | 13.5 |  |  |  |  |  |  | 0.2 |  | 0.3
Number of share issued, price per share | $ / shares | $ 42.5 |  |  |  |  |  |  |  |  |
Proceeds from issuing shares | $ 575 |  |  |  |  |  |  |  |  |
Share issue related cost | $ 24 |  |  |  |  |  |  |  |  |
Dividend reinvestment plan, unit issued (less than) | shares |  |  |  |  |  |  |  | 1.0 | 1.0 |
Dividend reinvestment plan, proceeds |  |  |  |  |  |  |  | $ 4 | $ 8 |
Issue of equity |  |  |  |  |  | $ 2 | $ 4 | $ 4 | $ 8 | $ 14
Non-controlling Interest - Redeemable Partnership Units [Member] | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding | shares |  |  |  |  |  | 115.8 | 115.8 | 115.8 | 115.8 |
Issued for cash | shares | 6.1 |  |  |  |  |  |  |  |  |
Proceeds from issuing shares | $ 250 |  |  |  |  |  |  |  |  |
Non-controlling Interest - Exchange LP Units, equity [Member] | Issued capital [member] |  |  |  |  |  |  |  |  |  |
Schedule of Partnership Units [Line Items] |  |  |  |  |  |  |  |  |  |
Issued for cash | shares |  |  |  |  |  |  |  | 0.0 |  | 5.7
Issue of equity |  |  |  |  |  |  |  | $ 0 |  | $ 232
Exchange LP unit conversion, shares | shares |  |  |  |  |  |  |  | 3.1 |  | 1.3
Exchange LP unit conversion, value |  |  |  |  |  |  |  | $ (51) |  | $ (20)

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