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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
9 Months Ended
Sep. 30, 2021
Oct. 25, 2021
Cover [Abstract]
Document Type 10-Q
Document Quarterly Report true
Document Period End Date Sep. 30, 2021
Document Transition Report false
Entity File Number 1-8944
Entity Registrant Name CLEVELAND-CLIFFS INC.
Entity Incorporation, State or Country Code OH
Entity Tax Identification Number 34-1464672
Entity Address, Address Line One 200 Public Square,
Entity Address, City or Town Cleveland,
Entity Address, State or Province OH
Entity Address, Postal Zip Code 44114-2315
City Area Code 216
Local Phone Number 694-5700
Title of 12(b) Security Common shares, par value $0.125 per share
Trading Symbol CLF
Security Exchange Name NYSE
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Small Business false
Entity Emerging Growth Company false
Entity Shell Company false
Entity Common Stock, Shares Outstanding 500,090,665
Entity Central Index Key 0000764065
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2021
Document Fiscal Period Focus Q3
Amendment Flag false