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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables reflect 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, 2020 | $ | (135) |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | (133) |
Other comprehensive income (loss) before reclassifications | — |  |  | (1) |  |  | 8 |  |  | 7 |
Net (gain) loss reclassified from accumulated other comprehensive loss | 7 |  |  | — |  |  | (1) |  |  | 6 |
March 31, 2021 | $ | (128) |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | (120) |
| (In Millions)
| Postretirement Benefit Liability, net of tax |  | Foreign Currency Translation |  | Derivative Financial Instruments, net of tax |  | Accumulated Other Comprehensive Loss
December 31, 2019 | $ | (316) |  |  | $ | — |  |  | $ | (3) |  |  | $ | (319) |
Other comprehensive loss before reclassifications | — |  |  | (1) |  |  | (5) |  |  | (6) |
Net loss reclassified from accumulated other comprehensive loss | 6 |  |  | — |  |  | 2 |  |  | 8 |
March 31, 2020 | $ | (310) |  |  | $ | (1) |  |  | $ | (6) |  |  | $ | (317) |
Details of Accumulated Other Comprehensive Income (Loss) Components | 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 Unaudited Condensed Consolidated Operations
|  |  | Three Months Ended March 31, |
|  |  |  |  | 2021 |  | 2020 |
Amortization of pension and OPEB liability: |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  |  | $ | 9 |  |  | $ | 7 |  |  | Other non-operating income
Income tax benefit |  |  |  |  |  | (2) |  |  | (1) |  |  | Income tax benefit (expense)
Net of taxes |  |  |  |  |  | $ | 7 |  |  | $ | 6 |  |  |
Changes in derivative financial instruments: |  |  |  |  |  |  |  |  |  |
Commodity contracts |  |  |  |  |  | $ | (1) |  |  | $ | 3 |  |  | Cost of goods sold
Income tax benefit |  |  |  |  |  | — |  |  | (1) |  |  | Income tax benefit (expense)
Net of taxes |  |  |  |  |  | $ | (1) |  |  | $ | 2 |  |  |
Total reclassifications for the period, net of tax |  |  |  |  |  | $ | 6 |  |  | $ | 8 |  |  |

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