CAPITAL STOCK - Narrative (Details) $ / shares in Units, $ in Millions |
12 Months Ended | ||||||
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Nov. 01, 2024
$ / shares
shares
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Dec. 31, 2024
USD ($)
shares
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Dec. 31, 2023
USD ($)
shares
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Dec. 31, 2022
USD ($)
shares
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Nov. 01, 2024
$ / shares
|
Apr. 22, 2024
USD ($)
|
Feb. 10, 2022
USD ($)
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| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Authorized amount of stock repurchase | $ | Ìý | Ìý | Ìý | Ìý | Ìý | $ 1,500 | $ 1,000 |
| Repurchase of common shares | $ | Ìý | $ 733 | $ 152 | $ 240 | Ìý | Ìý | Ìý |
| Remaining authorized purchase amount | $ | Ìý | $ 1,400 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Common Stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Common stock repurchases (in shares) | Ìý | 37,900,000 | 10,400,000 | 12,500,000 | Ìý | Ìý | Ìý |
| Common Shares in Treasury | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Repurchase of common shares | $ | Ìý | $ 733 | $ 152 | Ìý | Ìý | Ìý | Ìý |
| Stelco Holdings Inc | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Share price (in dollars per share) | (per share) | $ 60.00 | Ìý | Ìý | Ìý | $ 13.27 | Ìý | Ìý |
| Common stock per share | 25,862,021 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Acquisition (in shares) | Ìý | 25.9 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Stock Issued During Period, Value, Acquisitions | $ | Ìý | $ 343 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Business Acquisition, Shares Exchange Ratio | 0.454 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Stelco Holdings Inc | Common Stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Acquisition (in shares) | Ìý | 25,900,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Stelco Holdings Inc | Common Shares in Treasury | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Stock Issued During Period, Value, Acquisitions | $ | Ìý | $ 473 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Series B Preferred Stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock authorized (in shares) | Ìý | 4,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock issued (in shares) | Ìý | 0 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock outstanding (in shares) | Ìý | 0 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Series A Preferred Stock | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Class of Stock [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock authorized (in shares) | Ìý | 3,000,000 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock issued (in shares) | Ìý | 0 | Ìý | Ìý | Ìý | Ìý | Ìý |
| Preferred stock outstanding (in shares) | Ìý | 0 | Ìý | Ìý | Ìý | Ìý | Ìý |
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- Definition Business Acquisition, Shares Exchange Ratio No definition available.
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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Number of shares of equity interests issued or issuable to acquire entity. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The cash outflow to reacquire common stock during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares issued for nonredeemable preferred shares and preferred shares redeemable solely at option of issuer. Includes, but is not limited to, preferred shares issued, repurchased, and held as treasury shares. Excludes preferred shares classified as debt. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of shares of stock issued during the period pursuant to acquisitions. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Value of stock issued pursuant to acquisitions during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. No definition available.
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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