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Annual report pursuant to Section 13 and 15(d)

Cover

v3.22.0.1
Cover - USD ($)
12 Months Ended
Dec. 31, 2021
Feb. 10, 2022
Jun. 30, 2021
Cover [Abstract] Ìý Ìý Ìý
Document Type 10-K Ìý Ìý
Document Annual Report true Ìý Ìý
Document Period End Date Dec. 31, 2021 Ìý Ìý
Document Transition Report false Ìý Ìý
Entity File Number 1-8944 Ìý Ìý
Entity Registrant Name CLEVELAND-CLIFFS INC. Ìý Ìý
Entity Incorporation, State or Country Code OH Ìý Ìý
Entity Tax Identification Number 34-1464672 Ìý Ìý
Entity Address, Address Line One 200 Public Square, Ìý Ìý
Entity Address, City or Town Cleveland, Ìý Ìý
Entity Address, State or Province OH Ìý Ìý
Entity Address, Postal Zip Code 44114-2315 Ìý Ìý
City Area Code 216 Ìý Ìý
Local Phone Number 694-5700 Ìý Ìý
Title of 12(b) Security Common Shares, par value $0.125 per share Ìý Ìý
Trading Symbol CLF Ìý Ìý
Security Exchange Name NYSE Ìý Ìý
Entity Well-known Seasoned Issuer Yes Ìý Ìý
Entity Voluntary Filers No Ìý Ìý
Entity Current Reporting Status Yes Ìý Ìý
Entity Interactive Data Current Yes Ìý Ìý
Entity Filer Category Large Accelerated Filer Ìý Ìý
Entity Small Business false Ìý Ìý
Entity Emerging Growth Company false Ìý Ìý
ICFR Auditor Attestation Flag true Ìý Ìý
Entity Shell Company false Ìý Ìý
Entity Public Float Ìý Ìý $ 10,636,421,962
Entity Common Stock, Shares Outstanding Ìý 525,409,705 Ìý
Entity Central Index Key 0000764065 Ìý Ìý
Current Fiscal Year End Date --12-31 Ìý Ìý
Document Fiscal Year Focus 2021 Ìý Ìý
Document Fiscal Period Focus FY Ìý Ìý
Amendment Flag false Ìý Ìý
Documents Incorporated by Reference [Text Block] Portions of the registrant’s proxy statement for its 2022 annual meeting of shareholders are incorporated by reference into Part III. Ìý Ìý