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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 9 Months Ended
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Sep. 30, 2024
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) | 2024 |  | 2023 |  | 2024 |  | 2023
Foreign Currency Translation |  |  |  |  |  |  |
Beginning balance | $ | (1) |  |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |
Other comprehensive gain before reclassifications | 1 |  |  | — |  |  | — |  |  | — |
Ending balance | $ | — |  |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |
Derivative Instruments |  |  |  |  |  |  |
Beginning balance | $ | (103) |  |  | $ | (150) |  |  | $ | (170) |  |  | $ | (16) |
Other comprehensive loss before reclassifications | (36) |  |  | (21) |  |  | (67) |  |  | (229) |
Income tax benefit | 9 |  |  | 5 |  |  | 17 |  |  | 56 |
Other comprehensive loss before reclassifications, net of tax | (27) |  |  | (16) |  |  | (50) |  |  | (173) |
Losses reclassified from AOCI to net income (loss)1 | 38 |  |  | 63 |  |  | 158 |  |  | 93 |
Income tax benefit 2 | (9) |  |  | (16) |  |  | (39) |  |  | (23) |
Net losses reclassified from AOCI to net income (loss) | 29 |  |  | 47 |  |  | 119 |  |  | 70 |
Ending balance | $ | (101) |  |  | $ | (119) |  |  | $ | (101) |  |  | $ | (119) |
Pension and OPEB |  |  |  |  |  |  |
Beginning balance | $ | 1,770 |  |  | $ | 1,794 |  |  | $ | 1,827 |  |  | $ | 1,847 |
Gains reclassified from AOCI to net income (loss)3 | (37) |  |  | (35) |  |  | (114) |  |  | (106) |
Income tax expense 2 | 8 |  |  | 8 |  |  | 28 |  |  | 26 |
Net gains reclassified from AOCI to net income (loss) | (29) |  |  | (27) |  |  | (86) |  |  | (80) |
Ending balance | $ | 1,741 |  |  | $ | 1,767 |  |  | $ | 1,741 |  |  | $ | 1,767 |
Total AOCI Ending Balance | $ | 1,640 |  |  | $ | 1,647 |  |  | $ | 1,640 |  |  | $ | 1,647 |
1 Amounts recognized in Cost of goods sold in the Statements of Unaudited Condensed Consolidated Operations.
2 Amounts recognized in Income tax benefit (expense) 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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