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SHARE CAPITAL - Schedule of Common Shares (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 15, 2024 CAD ($) | Sep. 08, 2023 CAD ($) $ / shares shares | Jul. 31, 2024 CAD ($) $ / shares shares | Dec. 31, 2024 CAD ($) shares | Dec. 31, 2023 CAD ($) shares | Dec. 31, 2022 CAD ($) shares | Jul. 31, 2024 $ / shares
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period (in shares) | shares |  |  |  | 2,125,000,000 |  |  |
Shares issued, net of issue costs (in shares) | shares |  |  |  | 51,000,000 | 103,000,000 | 0 |
Shares issued, net of issue costs |  |  |  | $ 2,489.0 | $ 4,485.0 | $ 0.0 |
Shares issued on vesting of RSU, net of tax (in shares) | shares |  |  |  | 1,000,000 | 0 | 0 |
Shares issued on vesting of RSUs, net of tax |  |  |  | $ 30.0 | $ 12.0 | $ 0.0 |
Balance at end of period (in shares) | shares |  |  |  | 2,178,000,000 | 2,125,000,000 |  |
At-The-Market Offering |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Common shares that can be sold under the ATM Program | $ 2,750.0 |  |  |  |  |  |
Sale of stock, consideration received on transaction |  |  | $ 2,500.0 |  |  |  |
Sale of stock, consideration received on transaction, net |  |  | 2,480.0 |  |  |  |
Payments of stock issuance costs |  |  | $ 16.3 |  |  |  |
Public Offering Member |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Sale of stock, consideration received on transaction |  | $ 4,600.0 |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  | 102,913,500 |  |  |  |  |
Sale of stock, price per share (in Canadian dollars per share and US dollars per share) | $ / shares |  | $ 44.70 |  |  |  |  |
Common Shares |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Balance at beginning of period (in shares) | shares |  |  |  | 2,125,000,000 | 2,025,000,000 | 2,026,000,000 |
Balance at beginning of period, amount |  |  |  | $ 69,180.0 | $ 64,760.0 | $ 64,799.0 |
Shares issued on exercise of stock options (in shares) | shares |  |  |  | 1,000,000 | 0 | 2,000,000 |
Shares issued on exercise of stock options |  |  |  | $ 39.0 | $ 3.0 | $ 53.0 |
Share repurchases at stated value (in shares) | shares |  |  |  | 0 | (3,000,000) | (3,000,000) |
Share repurchases at stated value |  |  |  | $ 0.0 | $ (80.0) | $ (88.0) |
Other ( in shares) | shares |  |  |  | 0 | 0 | 0 |
Other |  |  |  | $ 0.0 | $ 0.0 | $ (4.0) |
Balance at end of period (in shares) | shares |  |  |  | 2,178,000,000 | 2,125,000,000 | 2,025,000,000 |
Balance at end of period, amount |  |  |  | $ 71,738.0 | $ 69,180.0 | $ 64,760.0 |
Common Shares | At-The-Market Offering |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (shares) | shares |  |  | 51,298,629 |  |  |  |
Sale of stock, price per share (in Canadian dollars per share and US dollars per share) | (per share) |  |  | $ 48.72 |  |  |  | $ 35.77

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