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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Comprehensive Income (Loss) Note [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) |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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