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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
Jan. 21, 2022
$ / shares
shares
Nov. 30, 2024
shares
Jun. 30, 2026
shares
Jun. 30, 2025
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2026
$ / shares
shares
Jun. 30, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
shares
Apr. 29, 2026
$ / shares
Dec. 31, 2024
shares
Schedule of Partnership Units [Line Items]                    
Quarterly distribution (usd per unit) | $ / shares                 $ 0.455  
Increase in distribution compared to prior year                 6.00%  
Limited partners’ capital                    
Schedule of Partnership Units [Line Items]                    
Repurchased and cancelled | $         $ 113.0          
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   293,000,000
Number of shares issued (in shares) 293,000,000                  
Perpetual subordinated notes | Series 7 Preferred Units                    
Schedule of Partnership Units [Line Items]                    
Number of shares issued (in shares) 12,000,000                  
Shares issued during period, price per share (dollars per share) | $ / shares $ 25                  
Perpetual subordinated notes | Series 14 Preferred Units                    
Schedule of Partnership Units [Line Items]                    
Preferred stock, dividend rate 5.125%                  
Preferred unitholders capital                    
Schedule of Partnership Units [Line Items]                    
Number of shares outstanding (in shares)     33,922,785   33,922,785 33,922,785   33,922,785   43,901,312
Repurchased and cancelled (in shares)         0     (9,978,527)    
Preferred unitholders capital | Series 1 Preferred Units                    
Schedule of Partnership Units [Line Items]                    
Repurchase of preferred equity | $         $ 90.0     $ 90.0    
Gain on redemption of equity instruments | $         $ 6.0     $ 2.0    
Limited Partners | Limited partners’ capital                    
Schedule of Partnership Units [Line Items]                    
Weighted average number of shares outstanding (in shares)     457,600,000 461,300,000 458,700,000   461,600,000      
Stock issued during period, dividend reinvestment plan (in shares)         200,000   200,000      
Dividend reinvestment plan, proceeds | $         $ 6.0   $ 5.0      
Number of shares outstanding (in shares)     457,708,454   457,708,454 457,708,454   460,488,788   461,855,350
Repurchased and cancelled (in shares)         (2,982,920)     (1,877,183)    
Number of shares issued (in shares)         164,207     330,047    
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   2,400,631
Non-controlling Interest - Class A Preferred Units                    
Schedule of Partnership Units [Line Items]                    
Repurchase, authorized percentage   5.00%                
Number of shares outstanding (in shares)   23,062,017                
Number of shares issued (in shares)   23,062,017                
Maximum percentage for public float   10.00%                
Non-controlling interest - exchange BIPC LP units, equity | Limited partners’ capital                    
Schedule of Partnership Units [Line Items]                    
Conversions (less than) (in shares)         100,000   100,000      
Conversions (less than) | $         $ 1.0   $ 1.0      
BIPC exchangeable shares and class A.2 exchangeable shares | Limited partners’ capital                    
Schedule of Partnership Units [Line Items]                    
Number of shares outstanding (in shares)     136,018,175   136,018,175 136,018,175   132,994,956   132,051,909
Number of shares issued (in shares)         2,982,920     833,272    
BIPC At The Market Program                    
Schedule of Partnership Units [Line Items]                    
Average prices ( in dollars per share) | (per share)         $ 47.27 $ 64.47        
Gross proceeds from issuances | $         $ 141.0          
Net proceeds from issuances | $         139.0          
Agent commission costs | $         $ 2.0          
Non-controlling interest - exchange LP units, equity | Limited partners’ capital                    
Schedule of Partnership Units [Line Items]                    
Number of shares outstanding (in shares)     5,369,125   5,369,125 5,369,125   5,447,803   5,738,152
Conversions (less than) (in shares)         78,678     290,349    
Conversions (less than) | $         $ 1.0   $ 1.0 $ 4.0    
Exchange LP unit conversion (less than) (in shares)         100,000   100,000