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SHARE CAPITAL - Narrative (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
May 25, 2022 USD ($) shares | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) | Jun. 30, 2022 $ / shares | Dec. 31, 2021 USD ($) shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Equity | $ |  | $ 4,405 |  |  | $ 1,499
Issuance of common equity | $ |  | $ 450 | $ 1,160 |  |
Class A exchangeable shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  | $ 39.74 |  |  |
Number of shares issued (in shares) |  | 10,877,989 |  |  | 10,877,989
Equity | $ |  | $ 532 |  |  | $ 535
Class B Limited Voting Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 500,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  | $ 39.74 |  |  |
Class C Non-Voting Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  | $ 1 |  |  |
Class A Senior Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 100,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  | $ 25 |  |  |
Class B Senior Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 100,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  |  |  | $ 25 |
Class A Junior Preferred shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  | $ 25 |  |  |
Number of shares issued (in shares) | 98,351,547 | 98,351,547 |  |  | 0
Equity | $ |  | $ 2,459 |  |  | $ 0
Issuance of common equity | $ | $ 2,500 |  |  |  |
Class B Junior Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000,000 |  |  |
Par value per share (USD/CAD per share) | $ / shares |  |  |  | $ 25 |
Class C shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued (in shares) | 11,270,466 | 34,815,014 |  |  | 23,544,548
Equity | $ |  | $ 1,413 |  |  | $ 963
Issuance of common equity | $ | $ 450 |  |  |  |

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