Cleveland-Cliffs Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Cover
- Cover
Financial Statements
Notes to Financial Statements
Accounting Policies
- BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)
Notes Tables
Notes Details

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Investments in Affiliates (Details)

v3.20.4

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Investments in Affiliates (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 09, 2020	Dec. 31, 2019
Other Noncurrent Assets [Member]	听	听	听
Schedule of Equity Method Investments [Line Items]	听	听	听
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ (105)	听	听
Other Noncurrent Liabilities [Member]	听	听	听
Schedule of Equity Method Investments [Line Items]	听	听	听
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	听	听	$ (18)
Combined Metals of Chicago, LLC [Member]	听	听	听
Schedule of Equity Method Investments [Line Items]	听	听	听
Ownership interest, equity method investment	40.00%	听	听
Spartan AG真人平台AG真人试玩 Coating, LLC [Member]	听	听	听
Schedule of Equity Method Investments [Line Items]	听	听	听
Ownership interest, equity method investment	48.00%	听	听
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity	$ 33	听	听
Hibbing [Member]	听	听	听
Schedule of Equity Method Investments [Line Items]	听	听	听
Ownership interest, equity method investment	85.30%	62.30%	23.00%

- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of investment in equity method investee and investment in and advance to affiliate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=clf_CombinedMetalsofChicagoLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=clf_SpartanAG真人平台AG真人试玩CoatingLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=clf_HibbingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

AG真人平台AG真人试玩

Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Investments in Affiliates (Details)