XML 171 R9999.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Label | Element | Value
--- | --- | ---
Capital Addition Purchase Commitments [Member] |  |
Recorded Unconditional Purchase Obligation | us-gaap_RecordedUnconditionalPurchaseObligation | $ 580,000,000
Common Stock [Member] |  |
Common Stock, New Shares, Issued | clf_CommonStockNewSharesIssued | 44,400,000
Common Stock, New Shares, Issued | clf_CommonStockNewSharesIssued | 63,300,000

X
- Definition Common Stock, New Shares, Issued + References No definition available. + Details
Name: | clf_CommonStockNewSharesIssued
Namespace Prefix: | clf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25383-109308 + Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |