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SEGMENT REPORTING - Results by Segment (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2024 USD ($) segment | Mar. 31, 2023 USD ($)
Segment Reporting [Abstract] |  |
Number of operating segments | segment | 4 |
Number of reportable segments | segment | 1 |
Segment Reporting Information [Line Items] |  |
Revenues | $ 5,199 | $ 5,295
Adjusted EBITDA | 414 | 243
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 2 | (5)
Steelmaking |  |
Segment Reporting Information [Line Items] |  |
Revenues | 5,027 | 5,126
Steelmaking | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 395 | 240
Other Businesses |  |
Segment Reporting Information [Line Items] |  |
Revenues | 172 | 169
Other Businesses | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ 17 | $ 8

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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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. 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