XML 86 R47.htm IDEA: XBRL DOCUMENT
v3.20.4

RELATED PARTIES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Related Party Transactions [Abstract] |
Summary Of Related Party Transactions Table Disclosure | Revenues from related parties were as follows:
| (In Millions)
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Revenue from related parties | $ | 893 |  |  | $ | 1,015 |  |  | $ | 1,344 |
Revenues 1 | $ | 5,354 |  |  | $ | 1,990 |  |  | $ | 2,332 |
Related party revenues as a percent of Revenues 1 | 16.7 | % |  | 51.0 | % |  | 57.6 | %
Purchases from related parties | $ | 16 |  |  | $ | — |  |  | $ | — |
1 Includes Realization of deferred revenue of $35 million for the year ended December 31, 2020.
Summary of Balance Sheet Presentation | The following table presents the classification of related party assets and liabilities in the Statements of Consolidated Financial Position:
|  | (In Millions)
|  | December 31,
Balance Sheet Location of Assets (Liabilities) |  | 2020 |  | 2019
Accounts receivable, net |  | $ | 2 |  |  | $ | 31 |
Other current assets |  | — |  |  | 45 |
Accounts payable |  | (6) |  |  | — |
Other current liabilities |  | — |  |  | (2) |

X
- Definition Summary of Balance Sheet Presentation [Table Text Block] + References No definition available. + Details
Name: | clf_SummaryofBalanceSheetPresentationTableTextBlock
Namespace Prefix: | clf_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration