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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The components of Accumulated other comprehensive income within Cliffs shareholders’ equity and related tax effects allocated to each are shown below:
|  |  | Three Months Ended March 31,
(In millions) |  |  |  |  | 2025 |  | 2024
Foreign Currency Translation |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | (70) |  |  | $ | — |
Other comprehensive income (loss) before reclassifications |  |  |  |  | 1 |  |  | (1) |
Ending balance |  |  |  |  | $ | (69) |  |  | $ | (1) |
Derivative Instruments |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | (53) |  |  | $ | (170) |
Other comprehensive income (loss) before reclassifications |  |  |  |  | 101 |  |  | (33) |
Income tax (benefit) |  |  |  |  | (24) |  |  | 8 |
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  |  | 77 |  |  | (25) |
Losses reclassified from AOCI to net loss 1 |  |  |  |  | 32 |  |  | 59 |
Income tax benefit 2 |  |  |  |  | (8) |  |  | (14) |
Net losses reclassified from AOCI to net loss |  |  |  |  | 24 |  |  | 45 |
Ending balance |  |  |  |  | $ | 48 |  |  | $ | (150) |
Pension and OPEB |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | 1,660 |  |  | $ | 1,827 |
Gains reclassified from AOCI to net loss 3 |  |  |  |  | (35) |  |  | (38) |
Income tax expense 2 |  |  |  |  | 8 |  |  | 10 |
Net gains reclassified from AOCI to net loss |  |  |  |  | (27) |  |  | (28) |
Ending balance |  |  |  |  | $ | 1,633 |  |  | $ | 1,799 |
Total AOCI Ending Balance |  |  |  |  | $ | 1,612 |  |  | $ | 1,648 |
1 Amounts recognized in Cost of goods sold for commodity purchase swaps within the Statements of Unaudited Condensed Consolidated Operations.
2 Amounts recognized in Income tax benefit in the Statements of Unaudited Condensed Consolidated Operations.
3 Amounts recognized in Net periodic benefit credits other than service cost component in the Statements of Unaudited Condensed Consolidated Operations.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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