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PARTNERSHIP CAPITAL - Additional Information (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 17, 2019
USD ($)
$ / shares
shares
Jul. 31, 2019
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
day
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Jul. 29, 2020
CAD ($)
shares
Mar. 31, 2020
shares
Schedule of Partnership Units [Line Items]                    
Repurchase Of Equity | $           $ 29,000,000        
Proceeds from issuing shares | $     $ 3,000,000 $ 2,000,000 $ 5,000,000 4,000,000        
Volume weighted average of trading price, number of trading days | day         5          
Issue of equity | $     $ 3,000,000 $ 2,000,000 $ 5,000,000 $ 4,000,000        
Brookfield Secondary Offering, Shares Issued | shares                 5,000,000  
Preferred Unitholders Capital [Member]                    
Schedule of Partnership Units [Line Items]                    
Preferred Units, Units Repurchased | shares           100,000        
Repurchase of Preferred Equity | $         $ 0 $ 1,000,000 $ 1,000,000      
Special General Partner | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Weighted average number of shares outstanding | shares     1,600,000 1,600,000 1,600,000 1,600,000        
Partners' Capital Account, Units, Treasury Units Purchased1 | shares         0   0      
Repurchase Of Equity | $         $ 0   $ 0      
Issued for cash | shares         0   0      
Issue of equity | $         $ 0   $ 0      
Class A Shares of BIPC conversion, shares | shares         0   0      
Class A Shares of BIPC conversion, value | $         $ 0   $ 0      
Limited Partners 1 [Member]                    
Schedule of Partnership Units [Line Items]                    
Repurchase Of Equity | $           $ 28,000,000        
Class A shares to Limited Partner Units, Conversion Ratio | shares     1   1          
Issue of equity | $     $ 3,000,000 $ 2,000,000 $ 5,000,000 $ 4,000,000        
Exchange LP Units to Limited Partner Units, Conversion Ratio | shares     1   1          
Limited Partners 1 [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Weighted average number of shares outstanding | shares     294,700,000 279,700,000 294,100,000 278,900,000        
Partners' Capital Account, Units, Treasury Units Purchased1 | shares           800,000 (800,000)      
Repurchase Of Equity | $           $ 28,000,000 $ 28,000,000      
Share Repurchase Related Cost | $           $ 1,000,000        
Issued for cash | shares 13,500,000       200,000   13,800,000      
Number of share issued, price per share | $ / shares $ 42.5                  
Proceeds from issuing shares | $ $ 575,000,000                  
Share issue related cost | $ 24,000,000                  
Dividend reinvestment plan, unit issued (less than) | shares         200,000 200,000        
Dividend reinvestment plan, proceeds | $         $ 5,000,000 $ 4,000,000        
Issue of equity | $     $ 3,000,000 $ 2,000,000 $ 5,000,000 $ 4,000,000 $ 559,000,000      
Class A Shares of BIPC conversion, shares | shares         1,300,000   0      
Class A Shares of BIPC conversion, value | $         $ 18,000,000   $ 0      
Non-controlling Interest - Redeemable Partnership Units [Member]                    
Schedule of Partnership Units [Line Items]                    
Increase (decrease) in equity | $ 8,000,000                  
Non-controlling Interest - Redeemable Partnership Units [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Weighted average number of shares outstanding | shares     121,900,000 115,800,000 121,900,000 115,800,000        
Issued for cash | shares   6,100,000     0   6,100,000      
Proceeds from issuing shares | $ $ 250,000,000                  
Issue of equity | $         $ 0   $ 250,000,000      
Brookfield Secondary Offering, Proceeds | $                 $ 305  
Non-controlling Interest - Class A Shares, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Class A shares to Limited Partner Units, Conversion Ratio | shares     1   1          
Non-controlling Interest - Class A Shares, equity [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Number Of Shares Issued1, non cash | shares         46,300,000   0      
Class A Shares of BIPC conversion, shares | shares         (1,300,000)   0      
Class A Shares of BIPC conversion, value | $         $ 18,000,000   $ 0      
Non-controlling Interest - Exchange LP Units, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Exchange LP Units to Limited Partner Units, Conversion Ratio | shares     1   1          
Non-controlling Interest - Exchange LP Units, equity [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Issued for cash | shares               5,700,000    
Issue of equity | $               $ 232,000,000    
Exchange LP unit special distribution, value | $         $ 0          
Exchange LP unit special distribution, shares | shares         100,000   0      
Exchange LP unit conversion, shares | shares         (200,000) 3,100,000 (3,200,000)      
Exchange LP unit conversion, value | $         $ (2,000,000) $ (51,000,000) $ 53,000,000      
Bottom of range | Limited Partners 1 [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Partners' Capital Account, Units, Treasury Units Purchased1 | shares         0          
Repurchase Of Equity | $         $ 0          
Bottom of range | Non-controlling Interest - Exchange LP Units, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Brookfield Infrastructure Corporation, Special Distribution, Exchange LP Units, Conversion Ratio | shares                   1
Top of range | Limited Partners 1 [Member] | Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Partners' Capital Account, Units, Treasury Units Purchased1 | shares         100,000          
Repurchase Of Equity | $         $ 1,000,000          
Top of range | Non-controlling Interest - Exchange LP Units, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Brookfield Infrastructure Corporation, Special Distribution, Exchange LP Units, Conversion Ratio | shares                   9