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PARTNERSHIP CAPITAL - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 21, 2022
Nov. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Apr. 30, 2025
Dec. 31, 2023
Schedule of Partnership Units [Line Items]                  
Quarterly distribution (usd per unit)               $ 0.43  
Increase in distribution compared to prior year               6.00%  
Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Repurchased and cancelled (in shares)         1,000,000 0      
Partners' Capital Account, Value, Treasury Units Purchased1         $ 29        
Perpetual subordinated notes                  
Schedule of Partnership Units [Line Items]                  
Number of shares outstanding (in shares)     293,000,000   293,000,000   293,000,000   293,000,000
Number of shares issued (in shares) 12,000,000                
Shares issued during period, price per share (dollars per share) $ 25                
Preferred stock, dividend rate 5.125%                
Partnership units repurchased, net of costs and issuances $ 293                
Preferred unitholders capital                  
Schedule of Partnership Units [Line Items]                  
Number of shares outstanding (in shares)     38,912,047   38,912,047   43,901,312   43,901,312
Repurchased and cancelled (in shares)         4,989,265   0    
Preferred unitholders capital | Series 1 Preferred Units                  
Schedule of Partnership Units [Line Items]                  
Repurchase of preferred equity         $ 90        
Gain on redemption of equity instruments         $ 6        
General partner | Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Weighted average number of shares outstanding (in shares)     2,400,000 2,400,000 2,400,000 2,400,000      
Number of shares outstanding (in shares)     2,400,631   2,400,631   2,400,631   2,400,631
Limited Partners | Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Weighted average number of shares outstanding (in shares)     461,300,000 461,500,000 461,600,000 461,400,000      
Stock issued during period, dividend reinvestment plan (in shares)         200,000 200,000      
Dividend reinvestment plan, proceeds         $ 5 $ 6      
Number of shares outstanding (in shares)     461,081,508   461,081,508   461,855,350   461,343,972
Repurchased and cancelled (in shares)         1,043,911   0    
Number of shares issued (in shares)         164,617   343,347    
Non-controlling Interest - Class A Preferred Units                  
Schedule of Partnership Units [Line Items]                  
Repurchase, authorized percentage   5.00%              
Number of shares issued   23,088,572              
Number of shares outstanding (in shares)   23,088,572              
Maximum percentage for public float   10.00%              
Non-controlling interest – BIPC exchangeable shares and class A.2 exchangeable shares | Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Number of shares outstanding (in shares)     132,064,238   132,064,238   132,051,909   131,872,066
Conversions (less than in 2025) (in shares)         12,329 100,000 179,843    
Conversions (less than in 2025)         $ 0 $ 1 $ 2    
Non-controlling interest - exchange LP units, equity | Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Number of shares outstanding (in shares)     5,620,371   5,620,371   5,738,152   6,086,026
Conversions (less than in 2025) (in shares)         (117,781)   (347,874)    
Conversions (less than in 2025)         $ (2) $ 2 $ (5)    
Exchange LP unit conversion (less than) (in shares)         100,000 200,000      
Exchange LP unit conversion, value         $ (1)        
Non-controlling interest - exchange BIPC LP units, equity | Limited partners’ capital                  
Schedule of Partnership Units [Line Items]                  
Conversions (less than in 2025) (in shares)         100,000 200,000      
Conversions (less than in 2025)         $ 1 $ 1