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INVESTMENT IN ASSOCIATES AND JOINT VENTURES - Change in Investments (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 26, 2021 | Dec. 07, 2020 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 08, 2021
Reconciliation of changes in associates and joint ventures |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  |  |  |  | $ 5,528,000,000 | $ 4,967,000,000 | $ 4,967,000,000 |
Share of earnings for the year |  |  |  |  | $ 10,000,000 | $ 11,000,000 | 77,000,000 | $ 59,000,000 | 131,000,000 |
Foreign currency translation and other |  |  |  |  |  |  | (45,000,000) |  | (245,000,000) |
Share of other comprehensive income from associates and joint ventures, other than foreign exchange differences |  |  |  |  |  |  | 5,000,000 |  | 7,000,000 |
Distributions |  |  |  |  |  |  | (59,000,000) |  | (167,000,000) |
Disposition of interest |  |  |  |  |  |  | (336,000,000) |  | 0 |
Increase (Decrease) Through Change In Basis Of Accounting, Joint Ventures And Associates |  |  |  |  |  |  | (43,000,000) |  | 466,000,000 |
Acquisitions |  |  |  |  |  |  | 0 |  | 369,000,000 |
Balance at end of year |  |  |  |  | 5,127,000,000 |  | 5,127,000,000 |  | 5,528,000,000 |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Increase (Decrease) Through Change In Basis Of Accounting, Joint Ventures And Associates |  |  |  |  |  |  | (43,000,000) |  | 466,000,000 |
Acquisitions |  |  |  |  |  |  | 0 |  | 369,000,000 |
U.S. gas pipeline |  |  |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  |  |  |  |  |  |  |  |  | 13.00%
Proceeds from sales of investments accounted for using equity method |  |  | $ 412,000,000 |  |  |  |  |  |  |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Gain (Loss) On Sale Of Investments Accounted For Using Equity Method |  |  | 75,000,000 |  |  |  |  |  |  |
Repayments of bonds, notes and debentures |  |  | $ 125,000,000 |  |  |  |  |  |  |
Brazilian electricity transmission operation |  |  |  |  |  |  |  |  |  |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Ownership Interest | 31.00% |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 15.00% |  |  |  |  |  |  |  |  |
U.S. LNG Export Terminal |  |  |  |  |  |  |  |  |  |
Reconciliation of changes in associates and joint ventures |  |  |  |  |  |  |  |  |  |
Acquisitions |  |  |  | $ 369,000,000 |  |  |  |  |  |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Ownership Interest |  |  |  | 6.00% |  |  |  |  |  |
Acquisitions |  |  |  | $ 369,000,000 |  |  |  |  |  |
Proportion of voting rights held in associate |  |  |  | 41.00% |  |  |  |  |  |
North American Natural Gas Transmission Operation [Member] |  |  |  |  |  |  |  |  |  |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Loans and receivables |  |  |  |  | $ 375,000,000 |  | $ 375,000,000 |  | $ 500,000,000 |
Australian Regulated Terminal Operation |  |  |  |  |  |  |  |  |  |
Reconciliation of changes in associates and joint ventures |  |  |  |  |  |  |  |  |  |
Increase (Decrease) Through Change In Basis Of Accounting, Joint Ventures And Associates |  | $ 466,000,000 |  |  |  |  |  |  |  |
Disclosure Of Associates And Joint Ventures [Line Items] |  |  |  |  |  |  |  |  |  |
Disposal of ownership interest, percentage |  | 22.00% |  |  |  |  |  |  |  |
Repayment of loans and notes |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 49.00% |  |  |  |  |  |  |  |
Increase (Decrease) Through Change In Basis Of Accounting, Joint Ventures And Associates |  | $ 466,000,000 |  |  |  |  |  |  |  |

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