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PARTNERSHIP CAPITAL - Capital Categories (Details) - USD ($) shares in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 26, 2017 | Sep. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | $ 13,607 | $ 9,774 | $ 13,474 | $ 9,644 | $ 9,644
Changes in equity [abstract] |  |  |  |  |  |  |
Unit issuance |  |  | 4 | 5 | 8 | 11 |
Balance as |  |  | 12,276 | 12,624 | 12,276 | 12,624 | 13,474
Limited Partners 1 [Member] |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | 4,977 | 4,488 | 4,967 | 4,611 | 4,611
Changes in equity [abstract] |  |  |  |  |  |  |
Unit issuance |  |  | 4 | 5 | 8 | 11 |
Balance as |  |  | 4,545 | 4,253 | 4,545 | 4,253 | 4,967
Non-controlling Interest - Redeemable Partnership Units [Member] |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | 2,014 | 1,805 | 2,012 | 1,860 | 1,860
Changes in equity [abstract] |  |  |  |  |  |  |
Balance as |  |  | $ 1,832 | 1,705 | 1,832 | 1,705 | 2,012
Issued capital [member] | Special General Partner and Limited Partner |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  |  |  | $ 4,926 | $ 4,234 | $ 4,234
Changes in equity [abstract] |  |  |  |  |  |  |
Opening balance |  |  |  |  | 278.2 | 261.0 | 261.0
Issued for cash |  |  |  |  | 0.2 |  | 17.2
Ending balance |  |  | 278.4 |  | 278.4 |  | 278.2
Unit issuance |  |  |  |  | $ 8 |  | $ 692
Balance as |  |  | $ 4,934 |  | 4,934 |  | 4,926
Issued capital [member] | 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
Ending balance |  |  | 1.6 |  | 1.6 |  | 1.6
Unit issuance |  |  |  |  | $ 0 |  | $ 0
Balance as |  |  | $ 19 |  | 19 |  | 19
Issued capital [member] | Limited Partners 1 [Member] |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | $ 4,911 | 4,221 | $ 4,907 | $ 4,215 | $ 4,215
Changes in equity [abstract] |  |  |  |  |  |  |
Opening balance |  |  |  |  | 276.6 | 259.4 | 259.4
Issued for cash |  | 16.6 |  |  | 0.2 |  | 17.2
Ending balance |  |  | 276.8 |  | 276.8 |  | 276.6
Unit issuance |  |  | $ 4 | 5 | $ 8 | $ 11 | $ 692
Balance as |  |  | 4,915 | 4,226 | 4,915 | 4,226 | 4,907
Issued capital [member] | Non-controlling Interest - Redeemable Partnership Units [Member] |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | $ 2,078 | 1,778 | $ 2,078 | $ 1,778 | $ 1,778
Changes in equity [abstract] |  |  |  |  |  |  |
Opening balance |  |  |  |  | 115.8 | 108.4 | 108.4
Issued for cash |  | 7.4 |  |  | 0.0 |  | 7.4
Ending balance |  |  | 115.8 |  | 115.8 |  | 115.8
Unit issuance |  |  |  |  | $ 0 |  | $ 300
Balance as |  |  | $ 2,078 | 1,778 | 2,078 | $ 1,778 | 2,078
Preferred Unitholders Capital [Member] |  |  |  |  |  |  |
Increase (Decrease) in Partners' Capital [Roll Forward] |  |  |  |  |  |  |
Balance as |  |  | $ 752 | 595 | $ 595 | $ 375 | $ 375
Changes in equity [abstract] |  |  |  |  |  |  |
Opening balance |  |  |  |  | 32.0 | 20.0 | 20.0
Ending balance |  |  | 40.0 |  | 40.0 |  | 32.0
Balance as |  |  | $ 752 | $ 595 | $ 752 | $ 595 | $ 595
Series 9 Preferred Units | Preferred Unitholders Capital [Member] |  |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |  |
Issued for cash |  |  |  |  | 8.0 |  |
Unit issuance |  |  |  |  | $ 157 |  |
Series 7 Preferred Units | Preferred Unitholders Capital [Member] |  |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |  |
Issued for cash | 12.0 |  |  |  |  |  | 12.0
Unit issuance |  |  |  |  |  |  | $ 220

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