SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Discontinued Operation (Details) - USD ($) $ in Millions |
12 Months Ended | ||
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Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | Ìý | Ìý | Ìý |
| Income (loss) from discontinued operations, net of tax | $ 1 | $ (2) | $ 88 |
| Operating income (loss) | (142) | 429 | 673 |
| Foreign Currency Transaction Gain (Loss), Realized | $ 0 | $ 0 | 228 |
| Asia Pacific Iron Ore [Member] | Ìý | Ìý | Ìý |
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | Ìý | Ìý | Ìý |
| Operating income (loss) | Ìý | Ìý | (105) |
| Foreign Currency Transaction Gain (Loss), Realized | Ìý | Ìý | $ 228 |
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- Definition Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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