ACQUISITIONS - Narrative (Details) $ in Millions |
1 Months Ended | 12 Months Ended | 13 Months Ended | |||
|---|---|---|---|---|---|---|
Mar. 13, 2020 |
Dec. 31, 2021
USD ($)
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Dec. 31, 2021
USD ($)
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Dec. 31, 2020
USD ($)
segment
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Dec. 31, 2019
USD ($)
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Dec. 31, 2021
USD ($)
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| Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Number of businesses acquired | segment | Ìý | Ìý | Ìý | 2 | Ìý | Ìý |
| Revenues | Ìý | Ìý | $ 20,444 | $ 5,354 | $ 1,990 | Ìý |
| Net loss attributable to acquisition | Ìý | Ìý | 2,988 | (122) | 293 | Ìý |
| Amortization of inventory step-up | Ìý | Ìý | 161 | 96 | 0 | Ìý |
| Acquisition-related costs | Ìý | Ìý | 20 | 90 | $ 7 | Ìý |
| Ferrous Processing and Trading | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Revenues | Ìý | $ 153 | Ìý | Ìý | Ìý | Ìý |
| Net loss attributable to acquisition | Ìý | 18 | Ìý | Ìý | Ìý | Ìý |
| Amortization of inventory step-up | Ìý | $ 22 | Ìý | Ìý | Ìý | Ìý |
| Acquisition-related costs | Ìý | Ìý | 1 | Ìý | Ìý | Ìý |
| ArcelorMittal USA | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Acquisition-related costs | Ìý | Ìý | 3 | 26 | Ìý | Ìý |
| Revaluation of equity method investment | Ìý | Ìý | Ìý | Ìý | Ìý | $ 31 |
| AK Steel | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
| Acquisition-related costs | Ìý | Ìý | $ 1 | $ 26 | Ìý | Ìý |
| Exchange ratio | 0.400 | Ìý | Ìý | Ìý | Ìý | Ìý |
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- Definition Amortization of Inventory Step-up No definition available.
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- Definition Business Acquisition, Shares Exchange Ratio 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. No definition available.
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to equity interests acquired in connection with a business combination for which the initial accounting was incomplete. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The number of businesses acquired by the entity during the period. No definition available.
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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