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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 |  |  |

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