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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)