BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions |
12 Months Ended | ||||
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Dec. 31, 2021
USD ($)
employee
segment
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Nov. 18, 2021
segment
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Dec. 31, 2020
USD ($)
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Dec. 09, 2020 |
Dec. 31, 2019 |
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| Basis of Presentation and Significant Accounting Policies [Line Items] | |||||
| Number of employees | employee | 26,000 | ||||
| Number of operating segments | 4 | ||||
| Number of reportable segments | 1 | ||||
| Other Noncurrent Assets | |||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | |||||
| Investment in affiliates | $ | $ 128 | $ 105 | |||
| Ferrous Processing and Trading | |||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | |||||
| Number of facilities acquired | 22 | ||||
| Hibbing | |||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | |||||
| Ownership interest, equity method investment | 85.30% | 85.30% | 62.30% | 23.00% | |
| Workforce represented by labor unions | |||||
| Basis of Presentation and Significant Accounting Policies [Line Items] | |||||
| Number of employees | employee | 18,500 |
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- Definition Basis of Presentation and Significant Accounting Policies No definition available.
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- Definition Number of facilities acquired No definition available.
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- Definition Number of persons employed by the Entity No definition available.
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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/2009/role/commonPracticeRef
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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/2009/role/commonPracticeRef
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