ACQUISITIONS - Narrative (Details) $ in Millions |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
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Dec. 09, 2020
USD ($)
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Mar. 13, 2020
USD ($)
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Sep. 30, 2021
USD ($)
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Sep. 30, 2020
USD ($)
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Sep. 30, 2021
USD ($)
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Sep. 30, 2020
USD ($)
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Dec. 31, 2020
business
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Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Number of businesses acquired | business | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | 2 |
Acquisition-related costs | Ìý | Ìý | $ (4) | $ (7) | $ (18) | $ (68) | Ìý |
Other Operating Income (Expense) | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Equity interest loss | Ìý | Ìý | Ìý | Ìý | (18) | Ìý | Ìý |
ArcelorMittal USA | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Acquisition-related costs | Ìý | Ìý | $ (1) | Ìý | $ (3) | Ìý | Ìý |
Consideration transferred | $ 2,604 | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
AK Steel | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Business Acquisition [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý | Ìý |
Exchange ratio | Ìý | 0.400 | Ìý | Ìý | Ìý | Ìý | Ìý |
Consideration transferred | Ìý | $ 1,535 | Ìý | Ìý | Ìý | Ìý | Ìý |
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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 Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. 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 The number of businesses acquired by the entity during the period. No definition available.
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