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GOODWILL AND INTANGIBLE ASSETS AND LIABILITIES - Amortization of Intangible Liability (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Amortization of Intangible Liabilities | $ (1) | $ (1)
Remainder of 2025 | (4) |
2026 | (5) |
2027 | (5) |
2028 | (5) |
2029 | (5) |
2030 | $ (5) |

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- Definition Amortization Of Intangible Liability + References No definition available. + Details
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Remainder Of Fiscal Year + References No definition available. + Details
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Year Five + References No definition available. + Details
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Year Four + References No definition available. + Details
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Year One + References No definition available. + Details
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Namespace Prefix: | clf_
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Year Three + References No definition available. + Details
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Namespace Prefix: | clf_
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Balance Type: | credit
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- Definition Finite-Lived Intangible Liabilities, Amortization Credit, Year Two + References No definition available. + Details
Name: | clf_FiniteLivedIntangibleLiabilitiesAmortizationCreditYearTwo
Namespace Prefix: | clf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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