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Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

v3.21.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2021
Jul. 26, 2021
Cover [Abstract] Ìý Ìý
Document Type 10-Q Ìý
Document Quarterly Report true Ìý
Document Period End Date Jun. 30, 2021 Ìý
Document Transition Report false Ìý
Entity File Number 1-8944 Ìý
Entity Registrant Name CLEVELAND-CLIFFS INC. Ìý
Entity Incorporation, State or Country Code OH Ìý
Entity Tax Identification Number 34-1464672 Ìý
Entity Address, Address Line One 200 Public Square, Ìý
Entity Address, City or Town Cleveland, Ìý
Entity Address, State or Province OH Ìý
Entity Address, Postal Zip Code 44114-2315 Ìý
City Area Code 216 Ìý
Local Phone Number 694-5700 Ìý
Title of 12(b) Security Common shares, par value $0.125 per share Ìý
Trading Symbol CLF Ìý
Security Exchange Name NYSE Ìý
Entity Current Reporting Status Yes Ìý
Entity Interactive Data Current Yes Ìý
Entity Filer Category Large Accelerated Filer Ìý
Entity Small Business false Ìý
Entity Emerging Growth Company false Ìý
Entity Shell Company false Ìý
Entity Common Stock, Shares Outstanding Ìý 499,734,892
Entity Central Index Key 0000764065 Ìý
Current Fiscal Year End Date --12-31 Ìý
Document Fiscal Year Focus 2021 Ìý
Document Fiscal Period Focus Q2 Ìý
Amendment Flag false Ìý