BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - 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 ($)
employee
segment
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Nov. 01, 2024
$ / shares
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Dec. 31, 2023
USD ($)
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| Basis of Presentation and Significant Accounting Policies [Line Items] | ||||
| Number of employees | employee | 30,000 | |||
| Number of operating segments | 4 | |||
| Number of reportable segments | 1 | |||
| Stelco Holdings Inc | ||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | ||||
| Share price (in dollars per share) | (per share) | $ 60.00 | $ 13.27 | ||
| Common stock per share | shares | 25,862,021 | |||
| Business Acquisition, Shares Exchange Ratio | 0.454 | |||
| Stelco Holdings Inc | Stelco Holdings Inc | ||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | ||||
| Share price (in dollars per share) | $ / shares | $ 60.00 | |||
| Other non-current assets | ||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | ||||
| Investment in affiliates | $ | $ 131 | $ 123 |
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- Definition Basis of Presentation and Significant Accounting Policies No definition available.
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- Definition Business Acquisition, Shares Exchange Ratio No definition available.
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- Definition Number of persons employed by the Entity No definition available.
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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 Amount of investment in equity method investee and investment in and advance to affiliate. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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