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Note 35 - Closure of facilities at JFE's Keihin steel complex (Details)	12 Months Ended
	Dec. 31, 2020
JFE [member] | NKKTUBES [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Proportion of ownership interest in subsidiary	49.00%

X

- Definition

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

+ References

No definition available.

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- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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-Subparagraph c
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-URIDate 2019-03-27

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