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PARTNERSHIP CAPITAL - Capital Categories (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in equity [abstract] |  |  |  |  |
Balance as |  |  | $ 13,474 | $ 9,644 | $ 7,176
Unit issuance |  |  | 588 | 1,212 | 941
Repurchased and cancelled |  |  | (31) |  | (6)
Balance as |  | $ 9,644 | 14,668 | 13,474 | 9,644
Exchange LP unit conversion, value |  |  | 232 | 0 |
Limited Partners |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Balance as |  |  | 4,967 | 4,611 | 3,838
Unit issuance |  |  | 14 | 692 | 505
Repurchased and cancelled |  |  | (30) |  | (6)
Balance as |  | 4,611 | 4,513 | 4,967 | 4,611
Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Balance as |  |  | 2,012 | 1,860 | 1,518
Unit issuance |  |  |  | 300 | 250
Balance as |  | $ 1,860 | 1,823 | $ 2,012 | $ 1,860
Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Unit issuance |  |  | 232 |  |
Balance as |  |  | $ 71 |  |
Partners' capital | Special General Partner and Limited Partner |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 278,200,000 | 261,000,000 | 244,800,000
Issued for cash |  |  | 300,000 | 17,200,000 | 16,400,000
Units converted from Exchange LP units |  |  | 1,300,000 | 0 | 0
Repurchased and cancelled |  |  | (900,000) | 0 | (200,000)
Ending balance |  | 261,000,000 | 278,900,000 | 278,200,000 | 261,000,000
Balance as |  |  | $ 4,926 | $ 4,234 | $ 3,735
Unit issuance |  |  | 14 | 692 | 505
Units converted from Exchange LP units, value |  |  | 20 | 0 | 0
Repurchased and cancelled |  |  | (30) | 0 | (6)
Balance as |  | $ 4,234 | $ 4,930 | $ 4,926 | $ 4,234
Partners' capital | Special General Partner |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 1,600,000 | 1,600,000 | 1,600,000
Issued for cash |  |  | 0 | 0 | 0
Units converted from Exchange LP units |  |  | 0 | 0 | 0
Repurchased and cancelled |  |  | 0 | 0 | 0
Ending balance |  | 1,600,000 | 1,600,000 | 1,600,000 | 1,600,000
Balance as |  |  | $ 19 | $ 19 | $ 19
Unit issuance |  |  | 0 | 0 | 0
Units converted from Exchange LP units, value |  |  | 0 | 0 | 0
Repurchased and cancelled |  |  | 0 | 0 | 0
Balance as |  | $ 19 | $ 19 | $ 19 | $ 19
Partners' capital | Limited Partners |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 276,600,000 | 259,400,000 | 243,200,000
Issued for cash | 16,600,000 | 15,600,000 | 300,000 | 17,200,000 | 16,400,000
Units converted from Exchange LP units |  |  | 1,300,000 | 0 | 0
Repurchased and cancelled |  |  | (900,000) | 0 | (200,000)
Ending balance |  | 259,400,000 | 277,300,000 | 276,600,000 | 259,400,000
Balance as |  |  | $ 4,907 | $ 4,215 | $ 3,716
Unit issuance |  |  | 14 | 692 | 505
Units converted from Exchange LP units, value |  |  | 20 | 0 | 0
Repurchased and cancelled |  |  | (30) | 0 | (6)
Balance as |  | $ 4,215 | $ 4,911 | $ 4,907 | $ 4,215
Partners' capital | Non-Controlling Interest—Redeemable Partnership Units held by Brookfield |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 115,800,000 | 108,400,000 | 100,300,000
Issued for cash | 7,400,000 | 8,100,000 | 0 | 7,400,000 | 8,100,000
Ending balance |  | 108,400,000 | 115,800,000 | 115,800,000 | 108,400,000
Balance as |  |  | $ 2,078 | $ 1,778 | $ 1,528
Unit issuance |  |  | 0 | 300 | 250
Balance as |  | $ 1,778 | $ 2,078 | $ 2,078 | $ 1,778
Partners' capital | Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 0 | 0 | 0
Issued for cash |  |  | 5,700,000 | 0 | 0
Ending balance |  | 0 | 4,400,000 | 0 | 0
Balance as |  |  | $ 0 | $ 0 | $ 0
Unit issuance |  |  | 232 | 0 | 0
Balance as |  | $ 0 | $ 212 | $ 0 | $ 0
Exchange LP unit conversion, shares |  |  | 1,300,000 | 0 | 0
Exchange LP unit conversion, value |  |  | $ (20) | $ 0 | $ 0
Preferred Unitholders Capital |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |
Opening balance |  |  | 32,000,000 | 20,000,000 | 10,000,000
Issued for cash |  |  | 18,000,000 | 12,000,000 | 10,000,000
Ending balance |  | 20,000,000 | 49,900,000 | 32,000,000 | 20,000,000
Balance as |  |  | $ 595 | $ 375 | $ 189
Unit issuance |  |  | 342 | 220 | 186
Repurchased and cancelled |  |  | (1) |  |
Balance as |  | $ 375 | $ 936 | $ 595 | $ 375
Preferred Units, Units Repurchased |  |  | (100,000) | 0 | 0
Repurchase of Preferred Equity |  |  | $ (1) | $ 0 | $ 0

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