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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