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EMPLOYEE BENEFITS (Details Narrative) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
IfrsStatementLineItems [Line Items] |  |
Number of shares held | 3,486,252 | 4,450,652
Plan assets value | R$ 5,800,000,000 | R$ 5,700,000,000
Actuarial assumption of expected rates of salary increases | 6.08% | 4.35%
Description of investment policy | The investment plan is reviewed annually and approved by the Deliberative Council, considering a 5-year horizon, as established by CGPC resolution no. 7, of December 4, 2003. The investment limits and criteria established in the policy are based on Resolution 4,661 / 18, published by the National Monetary Council (“CMN”). |
Pension plan expense | R$ 1,616 | R$ 2,032
Defined Benefit Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Description of pension fund market | In compliance with current legislation, specific to the pension fund market, for the last 4 years ended (2018, 2019,2020 and 2021), there was no need to pay installments by CSN, since the benefit plans defined actuarial gains in the year |
Plan Covering Thirty Five Percent Of The Average Salary [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of expected rates of salary increases | 3500.00% |
Participants salary term | 12 months |
Average Salary Supplementation Plan [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Actuarial assumption of expected rates of salary increases | 35.00% |
Participants salary term | 12 months |
Mixed Supplementary Benefit Plan [Member] | Not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period | R$ 23,578 |
Decrease (increase) in net defined benefit liability (asset) resulting from contributions to plan by plan participants | R$ 1,377 |

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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_f&doctype=Standard -URIDate 2021-03-24 + Details
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