XML 103 R77.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions | Apr. 03, 2024 | Mar. 18, 2024 | Apr. 22, 2024 | Feb. 10, 2022
--- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |
Authorized amount of stock repurchase |  |  |  | $ 1,000
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amount of debt extinguished |  | $ 640 |  |
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Authorized amount of stock repurchase |  |  | $ 1,500 |
Subsequent Event | 6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Amount of debt extinguished | $ 189 |  |  |

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clf_A67502026SeniorSecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=clf_ClevelandCliffsInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |