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ACQUISITIONS - Consideration (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | Nov. 01, 2024 USD ($) | Nov. 01, 2024 CAD ($) $ / shares | Nov. 18, 2021 USD ($) | Dec. 31, 2024 shares | Nov. 01, 2024 USD ($) $ / shares shares | Dec. 31, 2023 shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common shares, outstanding (in shares) |  |  |  | 493,948,905 |  | 504,886,773 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  | 200,000 |  | 500,000 | 600,000 | 1,000,000.0
Stelco Holdings Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total cash consideration | $ 2,450 | $ 3,418 |  |  |  |  |  |
Total share exchange consideration | 343 | 343 |  |  |  |  |  |
Total debt consideration | $ |  |  |  |  | $ 415 |  |  |
Total purchase consideration | $ |  |  | $ 3,208 |  |  |  |  |
Common shares, outstanding (in shares) |  |  |  |  | 54,448,388 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  | 2,516,415 |  |  |
Total consideration shares |  |  |  |  | 56,964,803 |  |  |
Foreign Currency Exchange Rate, Translation |  |  |  |  | 0.7168 |  |  |
Share price (in dollars per share) | (per share) |  | $ 60.00 |  |  | $ 13.27 |  |  |
Business Acquisition, Shares Exchange Ratio | 0.454 | 0.454 |  |  |  |  |  |

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