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CAPITAL STOCK (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2021 | May 04, 2021 | Nov. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020
Disclosure of classes of share capital [line items] |  |  |  |  |
Decrease through other distributions to owners, equity |  |  |  | $ 250 |
Capital stock |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued in dividend reinvestment plan with owners |  |  |  | 104,000 | 101,000
Decrease through other distributions to owners, equity |  |  |  | $ 250 |
Other |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Decrease through other distributions to owners, equity |  |  |  | $ 0 |
Other | Tranche 1 [Member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Decrease through other distributions to owners, equity | $ 250 | $ 750 |  |  |
Other | Tranche 2 and 3 [Member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Decrease through other distributions to owners, equity |  | $ 750 | $ 250 |  |
Common shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Par value per share (in dollars per share) |  |  |  | $ 0 |
Common shares | Capital stock |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued (shares) |  |  |  | 1,779,242,406 |
Number of shares issued in dividend reinvestment plan with owners |  |  |  | 103,785 |

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