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ACQUISITIONS - Consideration (Details) $ / shares in Units, $ / shares in Units, $ in Millions, $ in Millions | Nov. 01, 2024 USD ($) shares | Nov. 01, 2024 CAD ($) $ / shares shares | Jun. 30, 2025 shares | Dec. 31, 2024 shares | Nov. 01, 2024 USD ($) $ / shares shares
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Common shares, outstanding (in shares) |  |  | 494,679,326 | 493,948,905 |
Stelco Holdings Inc |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2,450 | $ 3,418 |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Fair Value Method | 343 | 343 |  |  |
Business Combination, Consideration Transferred, Debt Consideration | $ |  |  |  |  | $ 415
Business Combination, Consideration Transferred | $ | $ 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
Price per share (in dollars per share) | (per share) |  | $ 60.00 |  |  | $ 13.27
Foreign Currency Exchange Rate, Translation |  |  |  |  | 0.7168
Business Acquisition, Shares Exchange Ratio | 0.454 | 0.454 |  |  |
Shares of Cliffs common shares issued to Stelco Holdings stockholders (in shares) | 25,862,021 | 25,862,021 |  |  |

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