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PARTNERSHIP CAPITAL - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 21, 2021
USD ($)
$ / shares
shares
Sep. 21, 2020
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
day
shares
Jun. 30, 2020
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Mar. 31, 2021
shares
Jul. 29, 2020
CAD ($)
shares
Mar. 31, 2020
shares
Schedule of Partnership Units [Line Items]                    
Repurchase Of Equity | $           $ (5,000,000)        
Proceeds from issuing shares | $     $ 3,000,000 $ 3,000,000 $ 6,000,000 5,000,000        
Volume weighted average of trading price, number of trading days | day         5          
Issue of equity | $     $ 3,000,000 3,000,000 $ 6,000,000          
Brookfield Secondary Offering, Shares Issued                 5,000,000  
Exchangeable shares issued as a result of the Holding LP Distribution, Total                   46,300,000
Limited Partners 1 [Member]                    
Schedule of Partnership Units [Line Items]                    
Repurchase Of Equity | $           (5,000,000)        
Class A shares to Limited Partner Units, Conversion Ratio     1   1          
Issue of equity | $     $ 3,000,000 3,000,000 $ 6,000,000          
Non-controlling Interest - Class A Shares, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Class A shares to Limited Partner Units, Conversion Ratio     1   1          
Preferred Unitholders Capital [Member]                    
Schedule of Partnership Units [Line Items]                    
Issued for cash         8,000,000.0   8,000,000.0      
Issue of equity | $         $ 194,000,000   $ 195,000,000      
Quarterly Fixed Distribution Rate         4.50%          
Preferred Unitholders Capital [Member] | Series 14 Preferred Units | Major ordinary share transactions [member]                    
Schedule of Partnership Units [Line Items]                    
Issued for cash 8,000,000                  
Number of share issued, price per share | $ / shares $ 25                  
Proceeds from issuing shares | $ $ 200,000,000                  
Quarterly Fixed Distribution Rate 5.00%                  
Share underwriting related cost | $ $ 6,000,000                  
Preferred Unitholders Capital [Member] | Series 13 Preferred Units                    
Schedule of Partnership Units [Line Items]                    
Issued for cash   8,000,000                
Number of share issued, price per share | $ / shares   $ 25                
Proceeds from issuing shares | $   $ 200,000,000                
Quarterly Fixed Distribution Rate   5.125%                
Share underwriting related cost | $   $ 5,000,000                
Issued capital [member]                    
Schedule of Partnership Units [Line Items]                    
Brookfield Secondary Offering, Proceeds | $                 $ 305  
Issued capital [member] | Limited Partners 1 [Member]                    
Schedule of Partnership Units [Line Items]                    
Repurchase Of Equity | $           $ (5,000,000)        
Issued for cash         100,000   200,000      
Dividend reinvestment plan, unit issued (less than)         100,000 200,000        
Dividend reinvestment plan, proceeds | $         $ 6,000,000 $ 5,000,000        
Issue of equity | $     $ 3,000,000 $ 3,000,000 $ 6,000,000   $ 9,000,000      
Class A Shares of BIPC conversion, shares         0   1,400,000      
Class A Shares of BIPC conversion, value | $         $ 0   $ 19,000,000      
Weighted average number of shares outstanding     295,500,000 294,700,000   294,100,000        
Issued capital [member] | Non-controlling Interest - Exchange LP Units, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Exchange LP unit special distribution, value | $         $ 0          
Exchange LP unit special distribution, shares         0   100,000      
Exchange LP unit conversion, shares         0   (300,000)      
Exchange LP unit conversion, value | $         $ 0   $ 3,000,000      
Exchange LP unit conversion, value, rounded | $         $ (1,000,000)          
Exchange LP unit conversion, shares, rounded         (100,000)          
Issued capital [member] | Non-controlling Interest - Class A Shares, equity [Member]                    
Schedule of Partnership Units [Line Items]                    
Number Of Shares Issued1, non cash         0   46,300,000      
Class A Shares of BIPC conversion, shares         0   1,400,000      
Class A Shares of BIPC conversion, value | $         $ 0   $ 19,000,000      
Exchangeable shares issued as a result of the Holding LP Distribution, Total                   46,300,000
Units converted from Class A share of BIPC, value, rounded | $         $ (1,000,000)          
Class A shares of BIPC conversion, shares, rounded         (100,000)          
Issued capital [member] | Special General Partner                    
Schedule of Partnership Units [Line Items]                    
Issued for cash         0   0      
Issue of equity | $         $ 0   $ 0      
Class A Shares of BIPC conversion, shares         0   0      
Class A Shares of BIPC conversion, value | $         $ 0   $ 0      
Weighted average number of shares outstanding     1,600,000 1,600,000 1,600,000 1,600,000        
Issued capital [member] | Non-controlling Interest - Redeemable Partnership Units [Member]                    
Schedule of Partnership Units [Line Items]                    
Issued for cash         0   0      
Issue of equity | $         $ 0   $ 0      
Weighted average number of shares outstanding       115,800,000 121,900,000 121,900,000        
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               1    
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               9