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Consolidated Statements of Comprehensive Income - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of comprehensive income [abstract] |  |  |
Net income for the year | R$ 4,292,618 | R$ 2,244,511 | R$ 5,200,583
Items that will not be subsequently reclassified to the statement of income |  |  |
Actuarial (losses)/gains on defined benefit plan from investments in subsidiaries | 879 | 424 | 903
Actuarial (losses)/gains on defined benefit pension plan | 132,059 | (113,518) | 413
Total Items that will not be subsequently reclassified to the statement of income | 132,938 | (113,094) | 1,316
Items that could be subsequently reclassified to the statement of income |  |  |
Cumulative translation adjustments for the year | 581,175 | 32,922 | (87,101)
(Loss)/gain on change in percentage of investments | 6,102 | (2,288) | (105)
Fair value through other comprehensive income |  |  | (1,559,680)
(Loss) / gain on business combination |  |  | (651)
(Loss)/gain on net investment hedge in foreign subsidiaries | (4,824) | 2,472 | (21,852)
(Loss)/gain cash flow hedge accounting, net of taxes | (5,537,174) | (604,828) | (1,415,962)
Cash flow hedge accounting reclassified to income upon realization, net of taxes | 1,667,886 | 790,353 | 370,191
Cash flow hedge accounting - "Platts" reclassified to income upon realization, net of taxes | 186,878 |  |
(Loss)/gain cash flow hedge accounting - "Platts" | (187,423) |  |
Total Items that could be subsequently reclassified to the statement of income | (3,287,380) | 218,631 | (2,715,160)
Other comprehensive income | (3,154,442) | 105,537 | (2,713,844)
Comprehensive income for the year | 1,138,176 | 2,350,048 | 2,486,739
Attributable to: |  |  |
Attributed to owners of the Company | 640,052 | 1,894,503 | 2,360,292
Attributed to non-controlling interests | R$ 498,124 | R$ 455,545 | R$ 126,447

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Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash flow hedge accounting platts reclassified to income upon realization net of taxes. + References No definition available. + Details
Name: | sid_CashFlowHedgeAccountingPlattsReclassifiedToIncomeUponRealizationNetOfTaxes
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount refers to the loss gain on business combination. + References No definition available. + Details
Name: | sid_LossGainOnBusinessCombination
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of lossgain cash flow hedge accounting platts. + References No definition available. + Details
Name: | sid_LossgainCashFlowHedgeAccountingPlatts
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration