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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables) | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following tables reflect the changes in Accumulated other comprehensive income related to Cliffs shareholders’ equity:
|  |  | Three Months Ended March 31,
(In millions) |  |  |  |  | 2023 |  | 2022
Foreign Currency Translation |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | (1) |  |  | $ | 1 |
Other comprehensive loss before reclassifications |  |  |  |  | — |  |  | — |
Ending balance |  |  |  |  | $ | (1) |  |  | $ | 1 |
Derivative Instruments |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | (16) |  |  | $ | 68 |
Other comprehensive income (loss) before reclassifications |  |  |  |  | (177) |  |  | 168 |
Income tax |  |  |  |  | 44 |  |  | (39) |
Other comprehensive income (loss) before reclassifications, net of tax |  |  |  |  | (133) |  |  | 129 |
Gains reclassified from AOCI to net income (loss)1 |  |  |  |  | (25) |  |  | (42) |
Income tax expense 2 |  |  |  |  | 6 |  |  | 9 |
Net gains reclassified from AOCI to net income (loss) |  |  |  |  | (19) |  |  | (33) |
Ending balance |  |  |  |  | $ | (168) |  |  | $ | 164 |
Pension and OPEB |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ | 1,847 |  |  | $ | 549 |
Losses (gains) reclassified from AOCI to net income (loss)3 |  |  |  |  | (35) |  |  | 1 |
Income tax expense 2 |  |  |  |  | 8 |  |  | — |
Net losses (gains) reclassified from AOCI to net income (loss) |  |  |  |  | (27) |  |  | 1 |
Ending balance |  |  |  |  | $ | 1,820 |  |  | $ | 550 |
Total AOCI Ending Balance |  |  |  |  | $ | 1,651 |  |  | $ | 715 |
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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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