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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables reflect the changes in Accumulated other comprehensive income (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 Income (Loss)
December 31, 2020 | $ | (135) |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | (133) |
Other comprehensive income (loss) before reclassifications | — |  |  | (1) |  |  | 8 |  |  | 7 |
Net (income) loss reclassified from AOCI | 7 |  |  | — |  |  | (1) |  |  | 6 |
March 31, 2021 | $ | (128) |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | (120) |
Other comprehensive income before reclassifications | — |  |  | — |  |  | 51 |  |  | 51 |
Net (income) loss reclassified from AOCI | 7 |  |  | — |  |  | (4) |  |  | 3 |
June 30, 2021 | $ | (121) |  |  | $ | 2 |  |  | $ | 53 |  |  | $ | (66) |
Other comprehensive income before reclassifications | — |  |  | — |  |  | 93 |  |  | 93 |
Net (income) loss reclassified from AOCI | 6 |  |  | — |  |  | (10) |  |  | (4) |
September 30, 2021 | $ | (115) |  |  | $ | 2 |  |  | $ | 136 |  |  | $ | 23 |
| (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 AOCI | 6 |  |  | — |  |  | 2 |  |  | 8 |
March 31, 2020 | $ | (310) |  |  | $ | (1) |  |  | $ | (6) |  |  | $ | (317) |
Other comprehensive income before reclassifications | — |  |  | 1 |  |  | 1 |  |  | 2 |
Net loss reclassified from AOCI | 6 |  |  | — |  |  | 3 |  |  | 9 |
June 30, 2020 | $ | (304) |  |  | $ | — |  |  | $ | (2) |  |  | $ | (306) |
Other comprehensive income before reclassifications | — |  |  | 2 |  |  | 12 |  |  | 14 |
Net loss reclassified from AOCI | 6 |  |  | — |  |  | 4 |  |  | 10 |
September 30, 2020 | $ | (298) |  |  | $ | 2 |  |  | $ | 14 |  |  | $ | (282) |
Details of Accumulated Other Comprehensive Income (Loss) Components | The following table reflects the details about Accumulated other comprehensive income (loss) components reclassified from Cliffs shareholders’ equity:
|  | (In Millions) |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount of (Income)/Loss Reclassified into Income, Net of Tax |  | Affected Line Item in the Statement of Unaudited Condensed Consolidated Operations
| Three Months Ended September 30, |  | Nine Months Ended September 30, |
| 2021 |  | 2020 |  | 2021 |  | 2020 |
Changes in pension and OPEB: |  |  |  |  |  |  |  |  |  |
Prior service credits |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |  | $ | (1) |  |  | Net periodic benefit credits other than service cost component
Net actuarial loss |  | 9 |  |  | 8 |  |  | 27 |  |  | 23 |  |  | Net periodic benefit credits other than service cost component
|  | 8 |  |  | 8 |  |  | 26 |  |  | 22 |  |  | Total before taxes
Income tax benefit |  | (2) |  |  | (2) |  |  | (6) |  |  | (4) |  |  | Income tax benefit (expense)
Net of taxes |  | $ | 6 |  |  | $ | 6 |  |  | $ | 20 |  |  | $ | 18 |  |  |
Changes in derivative financial instruments: |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | (13) |  |  | $ | 4 |  |  | $ | (19) |  |  | $ | 11 |  |  | Cost of goods sold
Income tax (benefit) expense |  | 3 |  |  | — |  |  | 4 |  |  | (2) |  |  | Income tax benefit (expense)
Net of taxes |  | $ | (10) |  |  | $ | 4 |  |  | $ | (15) |  |  | $ | 9 |  |  |
Total reclassifications for the period, net of tax |  | $ | (4) |  |  | $ | 10 |  |  | $ | 5 |  |  | $ | 27 |  |  |

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