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ACCUMULATED OTHERCOMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The components of Accumulated other comprehensive loss within Cliffs shareholders’ equity and related tax effects allocated to each are shown below:
| (In Millions)
| Pre-tax Amount |  | Tax Benefit |  | After-tax Amount
As of December 31, 2020: |  |  |  |  |
Postretirement benefit liability | $ | (221) |  |  | $ | 86 |  |  | $ | (135) |
Foreign currency translation adjustments | 3 |  |  | — |  |  | 3 |
Unrealized net loss on derivative financial instruments | (1) |  |  | — |  |  | (1) |
| $ | (219) |  |  | $ | 86 |  |  | $ | (133) |
As of December 31, 2019: |  |  |  |  |
Postretirement benefit liability | $ | (454) |  |  | $ | 138 |  |  | $ | (316) |
Unrealized net loss on derivative financial instruments | (4) |  |  | 1 |  |  | (3) |
| $ | (458) |  |  | $ | 139 |  |  | $ | (319) |
As of December 31, 2018: |  |  |  |  |
Postretirement benefit liability | $ | (408) |  |  | $ | 127 |  |  | $ | (281) |
Unrealized net loss on derivative financial instruments | (4) |  |  | 1 |  |  | (3) |
| $ | (412) |  |  | $ | 128 |  |  | $ | (284) |
The following table reflects the changes in Accumulated other comprehensive loss related to Cliffs shareholders’ equity:
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Foreign Currency Translation |  | Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Loss
December 31, 2017 | $ | (264) |  |  | $ | 225 |  |  | $ | — |  |  | $ | (39) |
Other comprehensive income (loss) before reclassifications | (43) |  |  | 3 |  |  | (1) |  |  | (41) |
Net loss (gain) reclassified from accumulated other comprehensive loss | 26 |  |  | (228) |  |  | (2) |  |  | (204) |
December 31, 2018 | (281) |  |  | — |  |  | (3) |  |  | (284) |
Other comprehensive loss before reclassifications | (57) |  |  | — |  |  | (2) |  |  | (59) |
Net loss reclassified from accumulated other comprehensive loss | 22 |  |  | — |  |  | 2 |  |  | 24 |
December 31, 2019 | (316) |  |  | — |  |  | (3) |  |  | (319) |
Other comprehensive income (loss) before reclassifications | 163 |  |  | 3 |  |  | (6) |  |  | 160 |
Net loss reclassified from accumulated other comprehensive loss | 18 |  |  | — |  |  | 8 |  |  | 26 |
December 31, 2020 | $ | (135) |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | (133) |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table reflects the details about Accumulated other comprehensive loss components reclassified from Cliffs shareholders’ equity:
|  | (In Millions) |  |
Details about Accumulated Other Comprehensive Loss Components |  | Amount of (Gain)/Loss Reclassified into Income, Net of Tax |  | Affected Line Item in the Statement of Consolidated Operations
| Year Ended December 31, |
| 2020 |  | 2019 |  | 2018 |
Amortization of pension and OPEB liability: |  |  |  |  |  |  |  |
Prior service costs 1 |  | $ | (1) |  |  | $ | (1) |  |  | $ | (1) |  |  | Other non-operating income
Net actuarial loss 1 |  | 30 |  |  | 29 |  |  | 27 |  |  | Other non-operating income
Settlements 1 |  | (6) |  |  | — |  |  | — |  |  | Other non-operating income
|  | 23 |  |  | 28 |  |  | 26 |  |  | Total before taxes
Income tax expense |  | (5) |  |  | (6) |  |  | — |  |  | Income tax benefit (expense)
|  | $ | 18 |  |  | $ | 22 |  |  | $ | 26 |  |  | Net of taxes
Changes in foreign currency translation: |  |  |  |  |  |  |  |
Gain on foreign currency translation 2 |  | $ | — |  |  | $ | — |  |  | $ | (228) |  |  | Income (loss) from discontinued operations, net of tax
Changes in derivative financial instruments: |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 10 |  |  | $ | 3 |  |  | $ | (2) |  |  | Cost of goods sold
Income tax expense |  | (2) |  |  | (1) |  |  | — |  |  | Income tax benefit (expense)
|  | $ | 8 |  |  | $ | 2 |  |  | $ | (2) |  |  | Net of taxes
Total reclassifications for the period, net of tax |  | $ | 26 |  |  | $ | 24 |  |  | $ | (204) |  |  |
1 These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See NOTE 10 - PENSIONS AND OTHER POSTRETIREMENT BENEFITS for further information.
2 Represents Australian accumulated currency translation adjustments due to the liquidation of our Australian subsidiaries' net assets.

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