XML 394 R186.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of weighted average life expectancy (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Male [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average life expectancy of employees (in years) | 20.24 | 20.24
Female [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average life expectancy in years of employees who are 40 (in years) | 20.24 | 20.24
Male 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average life expectancy of employees (in years) | 42.74 | 42.74
Female 1 [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Average life expectancy in years of employees who are 40 (in years) | 42.74 | 42.74

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- References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | sid_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | sid_
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Period Type: | duration

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- Details
Name: | sid_ParticipantsAxis=sid_MaleMember
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Data Type: | na
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- Details
Name: | sid_ParticipantsAxis=sid_FemaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | sid_ParticipantsAxis=sid_Male1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | sid_ParticipantsAxis=sid_Female1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |