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SHARE CAPITAL - Schedule of Share Capital (Details) $ / shares in Units, $ in Millions | Jun. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 $ / shares | Mar. 31, 2025 shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2024 $ / shares | Jun. 30, 2024 shares | Mar. 31, 2024 shares | Dec. 31, 2023 shares
--- | --- | --- | --- | --- | --- | --- | --- | ---
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury shares (in shares) |  | 2,078,024 |  |  | 2,000,000 |  |  |  |
Class A Senior Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par Value (in dollars per share) | $ / shares |  | $ 25.00 |  |  | $ 25.00 |  |  |  |
Preferred Shares Authorized (in shares) |  | 100,000,000 |  |  | 100,000,000 |  |  |  |
Preferred stock, outstanding (in shares) |  | 0 |  |  | 0 |  |  |  |
Preferred stock, carrying amount | $ |  | $ 0 |  |  | $ 0 |  |  |  |
Class B Senior Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par Value (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Preferred Shares Authorized (in shares) |  | 100,000,000 |  |  | 100,000,000 |  |  |  |
Preferred stock, outstanding (in shares) |  | 0 |  |  | 0 |  |  |  |
Preferred stock, carrying amount | $ |  | $ 0 |  |  | $ 0 |  |  |  |
Class A Junior Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par Value (in dollars per share) | $ / shares |  | $ 25.00 |  |  | $ 25.00 |  |  |  |
Preferred Shares Authorized (in shares) |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |
Preferred stock, outstanding (in shares) |  | 0 |  |  | 0 |  |  |  |
Preferred stock, carrying amount | $ |  | $ 0 |  |  | $ 0 |  |  |  |
Class B Junior Preferred Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par Value (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  | $ 25.00 |  |  |
Preferred Shares Authorized (in shares) |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |
Preferred stock, outstanding (in shares) |  | 0 |  |  | 0 |  |  |  |
Preferred stock, carrying amount | $ |  | $ 0 |  |  | $ 0 |  |  |  |
Class A Exchangeable Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares authorized (in shares) |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |
Shares outstanding (in shares) |  | 41,413,496 |  | 41,371,860 | 41,436,516 |  | 16,879,755 | 16,834,918 | 15,311,749
Common stock, carrying amount | $ |  | $ 1,434 |  |  | $ 1,441 |  |  |  |
Shares issued (in shares) |  | 43,491,520 |  |  | 43,460,516 |  |  |  |
Class A-1 Exchangeable Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ / shares |  | $ 32.92 |  |  | $ 33.10 |  |  |  |
Shares authorized (in shares) |  | 500,000,000 |  |  | 500,000,000 |  |  |  |
Shares outstanding (in shares) |  | 0 |  |  | 0 |  | 26,505,771 | 26,550,608 | 28,073,777
Common stock, carrying amount | $ |  | $ 0 |  |  | $ 0 |  |  |  |
Class B Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ / shares |  | $ 32.92 |  |  | $ 33.10 |  |  |  |
Shares authorized (in shares) |  | 500,000 |  |  | 500,000 |  |  |  |
Shares outstanding (in shares) |  | 24,000 |  | 24,000 | 24,000 |  | 24,000 | 24,000 | 24,000
Common stock, carrying amount | $ |  | $ 1 |  |  | $ 1 |  |  |  |
Class C Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ / shares |  | $ 1 |  |  | $ 1 |  |  |  |
Shares authorized (in shares) |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |
Shares outstanding (in shares) |  | 242,786,723 |  | 201,116,647 | 201,116,647 |  | 128,643,406 | 102,056,784 | 102,056,784
Common stock, carrying amount | $ |  | $ 10,736 |  |  | $ 8,526 |  |  |  |
Shares issued (in shares) |  | 242,786,723 |  |  | 201,116,647 |  |  |  |
Class A Exchangeable and Class B |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Par value (in dollars per share) | $ / shares |  | $ 32.92 |  |  | $ 33.10 |  |  |  |
Shares outstanding (in shares) |  | 41,437,496 |  |  | 41,460,516 |  |  |  |
Common stock, carrying amount | $ | [1] | $ 1,435 |  |  | $ 1,442 |  |  |  |
Shares issued (in shares) |  | 43,515,520 |  |  | 43,460,516 |  |  |  |
[1] | Class A exchangeable shares were held in treasury as of June 30, 2025 (December 31, 2024 – 2,000,000 Class A exchangeable shares).

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