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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  | Nine Months Ended September 30,
(In millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Foreign Currency Translation |  |  |  |  |  |  |
Beginning balance | $ | 33 |  |  | $ | (1) |  |  | $ | (70) |  |  | $ | — |
Other comprehensive income (loss) before reclassifications | (42) |  |  | 1 |  |  | 67 |  |  | — |
Income tax | 6 |  |  | — |  |  | — |  |  | — |
Other comprehensive income (loss) before reclassifications, net of tax | (36) |  |  | 1 |  |  | 67 |  |  | — |
Ending balance | $ | (3) |  |  | $ | — |  |  | $ | (3) |  |  | $ | — |
Derivative Instruments |  |  |  |  |  |  |
Beginning balance | $ | 3 |  |  | $ | (103) |  |  | $ | (53) |  |  | $ | (170) |
Other comprehensive loss before reclassifications | (41) |  |  | (36) |  |  | (33) |  |  | (67) |
Income tax | 10 |  |  | 9 |  |  | 8 |  |  | 17 |
Other comprehensive loss before reclassifications, net of tax | (31) |  |  | (27) |  |  | (25) |  |  | (50) |
Losses reclassified from AOCI to net loss 1 | 16 |  |  | 38 |  |  | 82 |  |  | 158 |
Income tax benefit 2 | (4) |  |  | (9) |  |  | (20) |  |  | (39) |
Net losses reclassified from AOCI to net loss | 12 |  |  | 29 |  |  | 62 |  |  | 119 |
Ending balance | $ | (16) |  |  | $ | (101) |  |  | $ | (16) |  |  | $ | (101) |
Pension and OPEB |  |  |  |  |  |  |
Beginning balance | $ | 1,608 |  |  | $ | 1,770 |  |  | $ | 1,660 |  |  | $ | 1,827 |
Gains reclassified from AOCI to net loss 3 | (34) |  |  | (37) |  |  | (103) |  |  | (114) |
Income tax expense 2 | 8 |  |  | 8 |  |  | 25 |  |  | 28 |
Net gains reclassified from AOCI to net loss | (26) |  |  | (29) |  |  | (78) |  |  | (86) |
Ending balance | $ | 1,582 |  |  | $ | 1,741 |  |  | $ | 1,582 |  |  | $ | 1,741 |
Total AOCI Ending Balance | $ | 1,563 |  |  | $ | 1,640 |  |  | $ | 1,563 |  |  | $ | 1,640 |
1 Amounts recognized in Revenues and Cost of goods sold for sales swaps and commodity purchase swaps, respectively, 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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