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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
Jul. 17, 2019
Jul. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Changes in equity [abstract]                
Balance as   $ 16,233.0 $ 19,058.0 $ 16,275.0 $ 22,177.0 $ 14,668.0 $ 14,668.0  
Unit issuance     3.0 2.0 5.0 4.0    
Repurchase Of Equity           (29.0)    
Balance as     18,743.0 16,233.0 18,743.0 16,233.0 22,177.0 $ 14,668.0
Non-controlling Interest - Redeemable Partnership Units [Member]                
Changes in equity [abstract]                
Balance as   1,815.0 1,606.0 1,863.0 2,039.0 1,823.0 1,823.0  
Balance as     1,520.0 1,815.0 1,520.0 1,815.0 2,039.0 1,823.0
Non-controlling Interest - Class A Shares, equity [Member]                
Changes in equity [abstract]                
Balance as     625.0   0.0      
Balance as     576.0   576.0   0.0  
Limited Partners 1 [Member]                
Changes in equity [abstract]                
Balance as   4,521.0 4,008.0 4,633.0 5,048.0 4,513.0 4,513.0  
Unit issuance     3.0 2.0 5.0 4.0    
Repurchase Of Equity           (28.0)    
Balance as     3,823.0 4,521.0 3,823.0 4,521.0 5,048.0 4,513.0
Non-controlling Interest - Exchange LP Units, equity [Member]                
Changes in equity [abstract]                
Balance as   $ 21.0 14.0 23.0 18.0 71.0 71.0  
Balance as     $ 12.0 21.0 $ 12.0 $ 21.0 $ 18.0 $ 71.0
Issued capital [member] | Non-controlling Interest - Redeemable Partnership Units [Member]                
Changes in equity [abstract]                
Opening balance         121.9 115.8 115.8  
Issued for cash   6.1     0.0   6.1  
Ending balance     121.9   121.9   121.9 115.8
Balance as   $ 2,078.0 $ 2,328.0 2,078.0 $ 2,328.0 $ 2,078.0 $ 2,078.0  
Unit issuance         0.0   250.0  
Balance as     $ 2,328.0 2,078.0 $ 2,328.0 $ 2,078.0 $ 2,328.0 $ 2,078.0
Issued capital [member] | Non-controlling Interest - Class A Shares, equity [Member]                
Changes in equity [abstract]                
Opening balance         0.0 0.0 0.0  
Non cash issuance         46.3   0.0  
Class A Shares of BIPC conversion, shares         (1.3)   0.0  
Ending balance     45.0   45.0   0.0 0.0
Balance as         $ 0.0 $ 0.0 $ 0.0  
Class A Shares of BIPC conversion, value         18.0   0.0  
Balance as     $ (18.0)   $ (18.0)   $ 0.0 $ 0.0
Issued capital [member] | Special General Partner and Limited Partner                
Changes in equity [abstract]                
Opening balance         295.1 278.9 278.9  
Issued for cash         0.2   13.8  
Units converted from Exchange LP units         0.2   3.2  
Class A Shares of BIPC conversion, shares         1.3   0.0  
Partners' Capital Account, Units, Treasury Units Purchased1         0.0   (0.8)  
Ending balance     296.8   296.8   295.1 278.9
Balance as         $ 5,514.0 $ 4,930.0 $ 4,930.0  
Unit issuance         5.0   559.0  
Units converted from Exchange LP units, value         2.0   53.0  
Class A Shares of BIPC conversion, value         18.0   0.0  
Repurchase Of Equity         0.0   (28.0)  
Balance as     $ 5,539.0   $ 5,539.0   $ 5,514.0 $ 4,930.0
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  
Class A Shares of BIPC conversion, shares         0.0   0.0  
Partners' Capital Account, Units, Treasury Units Purchased1         0.0   0.0  
Ending balance     1.6   1.6   1.6 1.6
Balance as         $ 19.0 $ 19.0 $ 19.0  
Unit issuance         0.0   0.0  
Units converted from Exchange LP units, value         0.0   0.0  
Class A Shares of BIPC conversion, value         0.0   0.0  
Repurchase Of Equity         0.0   0.0  
Balance as     $ 19.0   $ 19.0   $ 19.0 $ 19.0
Issued capital [member] | Limited Partners 1 [Member]                
Changes in equity [abstract]                
Opening balance         293.5 277.3 277.3  
Issued for cash 13.5       0.2   13.8  
Units converted from Exchange LP units         0.2   3.2  
Class A Shares of BIPC conversion, shares         1.3   0.0  
Partners' Capital Account, Units, Treasury Units Purchased1           0.8 (0.8)  
Ending balance     295.2   295.2   293.5 277.3
Balance as   $ 4,938.0 $ 5,498.0 4,935.0 $ 5,495.0 $ 4,911.0 $ 4,911.0  
Unit issuance     3.0 2.0 5.0 4.0 559.0  
Units converted from Exchange LP units, value         2.0   53.0  
Class A Shares of BIPC conversion, value         18.0   0.0  
Repurchase Of Equity           (28.0) (28.0)  
Balance as     $ 5,520.0 $ 4,938.0 $ 5,520.0 $ 4,938.0 $ 5,495.0 $ 4,911.0
Issued capital [member] | Non-controlling Interest - Exchange LP Units, equity [Member]                
Changes in equity [abstract]                
Opening balance         1.2 4.4 4.4  
Issued for cash               5.7
Exchange LP unit special distribution, shares         0.1   0.0  
Exchange LP unit conversion, shares         (0.2) 3.1 (3.2)  
Ending balance     1.1   1.1   1.2 4.4
Balance as         $ 159.0 $ 212.0 $ 212.0  
Unit issuance               $ 232.0
Exchange LP unit conversion, value         2.0 $ 51.0 (53.0)  
Balance as     $ 157.0   $ 157.0   $ 159.0 $ 212.0
Preferred Unitholders Capital [Member]                
Changes in equity [abstract]                
Opening balance         49.9 49.9 49.9  
Ending balance     49.9   49.9   49.9 49.9
Balance as         $ 935.0 $ 936.0 $ 936.0  
Repurchase of Preferred Equity         0.0 $ (1.0) (1.0)  
Balance as     $ 935.0   $ 935.0   $ 935.0 $ 936.0
Bottom of range | Issued capital [member] | Limited Partners 1 [Member]                
Changes in equity [abstract]                
Partners' Capital Account, Units, Treasury Units Purchased1         0.0      
Repurchase Of Equity         $ 0.0