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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 |  |

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