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9. PROPERTY, PLANT AND EQUIPMENT (Details 1) R$ in Thousands | 12 Months Ended
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Dec. 31, 2019 BRL (R$)
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | R$ 640,989
Remeasurement | (151,558)
Right-of-use assets [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 640,989
Addition | 43,111
Depreciation | (58,843)
Write-off | (1,354)
Balance at end | 472,345
Right-of-use assets [Member] | Cost [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 531,044
Right-of-use assets [Member] | Accumulated Depreciation [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | (58,699)
Land [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Remeasurement | (152,915)
Land [Member] | Right-of-use assets [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 556,133
Depreciation | (21,314)
Write-off | (1,338)
Balance at end | 380,566
Land [Member] | Right-of-use assets [Member] | Cost [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 401,746
Land [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | (21,180)
Buildings and Infrastructure [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Remeasurement | (12,112)
Buildings and Infrastructure [Member] | Right-of-use assets [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 54,513
Addition | 6,719
Depreciation | (9,190)
Balance at end | 64,154
Buildings and Infrastructure [Member] | Right-of-use assets [Member] | Cost [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 73,344
Buildings and Infrastructure [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | (9,190)
Machinery, Equipment and Facilities [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Remeasurement | (4,525)
Machinery, Equipment and Facilities [Member] | Right-of-use assets [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 9,783
Addition | 34,197
Depreciation | (15,311)
Balance at end | 24,144
Machinery, Equipment and Facilities [Member] | Right-of-use assets [Member] | Cost [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 39,455
Machinery, Equipment and Facilities [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | (15,311)
Other [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Remeasurement | (6,230)
Other [Member] | Right-of-use assets [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 20,560
Addition | 2,195
Depreciation | (13,028)
Write-off | (16)
Balance at end | 3,481
Other [Member] | Right-of-use assets [Member] | Cost [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 16,499
Other [Member] | Right-of-use assets [Member] | Accumulated Depreciation [Member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Initial recognition - Rights of use | 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 2019-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_h&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_AdditionsToRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the revaluation surplus that relates to right-of-use assets. [Refer: Revaluation surplus; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 57 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_57&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount refers to right of use- initial recognition. + References No definition available. + Details
Name: | sid_RightOfUseInitialRecognitionPropertyPlantAndEquipment
Namespace Prefix: | sid_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

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

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

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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