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PARTNERSHIP CAPITAL - Capital Categories (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 17, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Changes in equity [abstract] |  |  |  |  |  |
Balance as |  | $ 16,275 | $ 13,607 | $ 14,668 | $ 13,474 | $ 13,474
Unit issuance |  | 2 | 4 | 4 | 8 |
Repurchase Of Equity |  |  |  | 29 |  |
Balance as |  | 16,233 | 12,276 | 16,233 | 12,276 | 14,668
Limited Partners 1 [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Balance as |  | 4,633 | 4,977 | 4,513 | 4,967 | 4,967
Unit issuance |  | 2 | 4 | 4 | 8 |
Repurchase Of Equity |  |  |  | 28 |  |
Balance as |  | 4,521 | 4,545 | 4,521 | 4,545 | 4,513
Non-controlling Interest - Redeemable Partnership Units [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Balance as |  | 1,863 | 2,014 | 1,823 | 2,012 | 2,012
Balance as |  | 1,815 | 1,832 | 1,815 | $ 1,832 | $ 1,823
Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Balance as |  | 23 |  |  |  |
Balance as |  | $ 21 |  | $ 21 |  |
Issued capital [member] | Special General Partner and Limited Partner |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 278.9 | 278.2 | 278.2
Issued for cash |  |  |  | 0.2 |  | 0.3
Units converted from Exchange LP units |  |  |  | 3.1 |  | 1.3
Partners' Capital Account, Units, Treasury Units Purchased1 |  |  |  | (0.8) |  | (0.9)
Ending balance |  | 281.4 |  | 281.4 |  | 278.9
Balance as |  |  |  | $ 4,930 | $ 4,926 | $ 4,926
Unit issuance |  |  |  | 4 |  | 14
Units converted from Exchange LP units, value |  |  |  | 51 |  | 20
Repurchase Of Equity |  |  |  | (28) |  | (30)
Balance as |  | $ 4,957 |  | $ 4,957 |  | $ 4,930
Issued capital [member] | Special General Partner |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 1.6 | 1.6 | 1.6
Issued for cash |  |  |  | 0.0 |  | 0.0
Units converted from Exchange LP units |  |  |  | 0.0 |  | 0.0
Partners' Capital Account, Units, Treasury Units Purchased1 |  |  |  | 0.0 |  | 0.0
Ending balance |  | 1.6 |  | 1.6 |  | 1.6
Balance as |  |  |  | $ 19 | $ 19 | $ 19
Unit issuance |  |  |  | 0 |  | 0
Units converted from Exchange LP units, value |  |  |  | 0 |  | 0
Repurchase Of Equity |  |  |  | 0 |  | 0
Balance as |  | $ 19 |  | $ 19 |  | $ 19
Issued capital [member] | Limited Partners 1 [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 277.3 | 276.6 | 276.6
Issued for cash | 13.5 |  |  | 0.2 |  | 0.3
Units converted from Exchange LP units |  |  |  | 3.1 |  | 1.3
Partners' Capital Account, Units, Treasury Units Purchased1 |  |  |  | (0.8) |  | (0.9)
Ending balance |  | 279.8 |  | 279.8 |  | 277.3
Balance as |  | $ 4,935 | 4,911 | $ 4,911 | $ 4,907 | $ 4,907
Unit issuance |  | 2 | 4 | 4 | 8 | 14
Units converted from Exchange LP units, value |  |  |  | 51 |  | 20
Repurchase Of Equity |  |  |  | 28 |  | (30)
Balance as |  | $ 4,938 | 4,915 | $ 4,938 | $ 4,915 | $ 4,911
Issued capital [member] | Non-controlling Interest - Redeemable Partnership Units [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 115.8 | 115.8 | 115.8
Issued for cash | 6.1 |  |  |  |  |
Ending balance |  | 115.8 |  | 115.8 |  | 115.8
Balance as |  | $ 2,078 | 2,078 | $ 2,078 | $ 2,078 | $ 2,078
Balance as |  | $ 2,078 | 2,078 | $ 2,078 | $ 2,078 | $ 2,078
Issued capital [member] | Non-controlling Interest - Exchange LP Units, equity [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 4.4 | 0.0 | 0.0
Issued for cash |  |  |  | 0.0 |  | 5.7
Ending balance |  | 1.3 |  | 1.3 |  | 4.4
Balance as |  |  |  | $ 212 | $ 0 | $ 0
Unit issuance |  |  |  | 0 |  | 232
Balance as |  | $ 161 |  | $ 161 |  | $ 212
Exchange LP unit conversion, shares |  |  |  | (3.1) |  | (1.3)
Exchange LP unit conversion, value |  |  |  | $ (51) |  | $ (20)
Preferred Unitholders Capital [Member] |  |  |  |  |  |
Changes in equity [abstract] |  |  |  |  |  |
Opening balance |  |  |  | 49.9 | 32.0 | 32.0
Issued for cash |  |  |  | 0.0 |  | 18.0
Ending balance |  | 49.9 |  | 49.9 |  | 49.9
Balance as |  | $ 935 | 752 | $ 936 | $ 595 | $ 595
Unit issuance |  |  |  | 0 |  | 342
Repurchase Of Equity |  |  |  | 1 |  |
Balance as |  | $ 935 | $ 752 | $ 935 | $ 752 | $ 936
Preferred Units, Units Repurchased |  |  |  | 0.1 |  | (0.1)
Repurchase of Preferred Equity |  |  |  | $ (1) |  | $ (1)

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