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PARTNERSHIP CAPITAL - Capital Cathegories (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Apr. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 9,644 | $ 7,176 | $ 6,322
Changes in equity [abstract] |  |  |  |  |  |
Unit issuance |  |  |  | 992 | 755 | 932
Repurchased and cancelled |  |  |  |  | (6) | (67)
Balance as |  | $ 9,644 |  | 13,474 | 9,644 | 7,176
Limited Partners |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | 4,611 | 3,838 | 3,533
Changes in equity [abstract] |  |  |  |  |  |
Unit issuance |  |  |  | 692 | 505 | 582
Repurchased and cancelled |  |  |  |  | (6) | (67)
Balance as |  | 4,611 |  | 4,967 | 4,611 | 3,838
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | 1,860 | 1,518 | 1,321
Changes in equity [abstract] |  |  |  |  |  |
Unit issuance |  |  |  | 300 | 250 | 350
Balance as |  | $ 1,860 |  | 2,012 | 1,860 | 1,518
Partners' capital | Special General Partner and Limited Partner |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 4,234 | $ 3,735 | $ 3,220
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 261.0 | 244.8 | 227.1
Issued for cash |  |  |  | 17.2 | 16.4 | 20.2
Repurchased and cancelled |  |  |  | 0.0 | (0.2) | (2.5)
Ending balance |  | 261.0 |  | 278.2 | 261.0 | 244.8
Unit issuance |  |  |  | $ 692 | $ 505 | $ 582
Repurchased and cancelled |  |  |  | 0 | (6) | (67)
Balance as |  | $ 4,234 |  | 4,926 | 4,234 | 3,735
Partners' capital | Special General Partner |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 19 | $ 19 | $ 19
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 1.6 | 1.6 | 1.6
Issued for cash |  |  |  | 0.0 | 0.0 | 0.0
Repurchased and cancelled |  |  |  | 0.0 | 0.0 | 0.0
Ending balance |  | 1.6 |  | 1.6 | 1.6 | 1.6
Unit issuance |  |  |  | $ 0 | $ 0 | $ 0
Repurchased and cancelled |  |  |  | 0 | 0 | 0
Balance as |  | $ 19 |  | 19 | 19 | 19
Partners' capital | Limited Partners |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 4,215 | $ 3,716 | $ 3,201
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 259.4 | 243.2 | 225.5
Issued for cash | 16.6 | 15.6 | 20.0 | 17.2 | 16.4 | 20.2
Repurchased and cancelled |  |  |  | 0.0 | (0.2) | (2.5)
Ending balance |  | 259.4 |  | 276.6 | 259.4 | 243.2
Unit issuance |  |  |  | $ 692 | $ 505 | $ 582
Repurchased and cancelled |  |  |  | 0 | (6) | (67)
Balance as |  | $ 4,215 |  | 4,907 | 4,215 | 3,716
Partners' capital | Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 1,778 | $ 1,528 | $ 1,178
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 108.4 | 100.3 | 88.1
Issued for cash | 7.4 | 8.1 | 12.2 | 7.4 | 8.1 | 12.2
Ending balance |  | 108.4 |  | 115.8 | 108.4 | 100.3
Unit issuance |  |  |  | $ 300 | $ 250 | $ 350
Balance as |  | $ 1,778 |  | 2,078 | 1,778 | 1,528
Preferred Unitholders Capital |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |
Balance as |  |  |  | $ 375 | $ 189 | $ 0
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 20.0 | 10.0 | 0.0
Issued for cash |  |  |  | 12.0 | 10.0 | 10.0
Ending balance |  | 20.0 |  | 32.0 | 20.0 | 10.0
Unit issuance |  |  |  | $ 220 | $ 186 | $ 189
Balance as |  | $ 375 |  | $ 595 | $ 375 | $ 189

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