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11. PROPERTY, PLANT AND EQUIPMENT (Details 1) - Right-of-use assets [member] - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | R$ 472,345 | R$ 640,989
Effect of foreign exchange differences | 4,329 |
Addition | 49,934 | 43,111
Remesurement | 60,058 | (151,558)
Depreciation | (62,680) | (58,843)
Write-offs | (7,318) | (1,354)
Balance at end | 516,668 | 472,345
Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 531,044 |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | 634,786 | 531,044
Accumulated depreciation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | (58,699) |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | (118,118) | (58,699)
Land [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 380,566 | 556,133
Addition | 9,039 |
Remesurement | 34,645 | (152,915)
Depreciation | (24,467) | (21,314)
Write-offs | (6,580) | (1,338)
Transfers to other asset categories | (188) |
Balance at end | 393,015 | 380,566
Land [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 401,746 |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | 434,689 | 401,746
Land [member] | Accumulated depreciation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | (21,180) |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | (41,674) | (21,180)
Buildings and infrastructure [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 64,154 | 54,513
Effect of foreign exchange differences | 988 |
Addition | 4,561 | 6,719
Remesurement | 3,827 | 12,112
Depreciation | (983) | (9,190)
Write-offs | (399) |
Transfers to other asset categories | (6,062) |
Balance at end | 66,086 | 64,154
Buildings and infrastructure [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 73,344 |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | 75,882 | 73,344
Buildings and infrastructure [member] | Accumulated depreciation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | (9,190) |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | (9,796) | (9,190)
Machinery, equipment and facilities [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 24,144 | 9,783
Effect of foreign exchange differences | 294 |
Addition | 23,720 | 34,197
Remesurement | 21,557 | (4,525)
Depreciation | (14,211) | (15,311)
Transfers to other asset categories | (3,558) |
Balance at end | 51,946 | 24,144
Machinery, equipment and facilities [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 39,455 |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | 81,598 | 39,455
Machinery, equipment and facilities [member] | Accumulated depreciation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | (15,311) |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | (29,652) | (15,311)
Other [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 3,481 | 20,560
Effect of foreign exchange differences | 3,047 |
Addition | 12,614 | 2,195
Remesurement | 29 | (6,230)
Depreciation | (23,019) | (13,028)
Write-offs | (339) | (16)
Transfers to other asset categories | 9,808 |
Balance at end | 5,621 | 3,481
Other [member] | Cost [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | 16,499 |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | 42,617 | 16,499
Other [member] | Accumulated depreciation [member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning | (13,018) |
Effect of foreign exchange differences |  |
Write-offs |  |
Balance at end | R$ (36,996) | R$ (13,018)

X
- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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- 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. + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
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- Definition The amount of rightofuse assets remeasurement. + References No definition available. + Details
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- Definition The amount of transfers to other asset categories. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount refers to write off right ofuse assets. + References No definition available. + Details
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Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
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