XML 128 R53.htm IDEA: XBRL DOCUMENT
v3.20.1

17 PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Provision For Environmental Liabilities And Asset Retirement Obligations [Abstract] |
Schedule of provision for environmental liabilities and asset retirement obligation | The carrying amount of the provision for environmental liabilities and asset retirement obligation (ARO) are as follows:
|  |  | Consolidated
| 12/31/2019 |  | 12/31/2018
Environmental liabilities | 192,270 |  | 198,386
Asset retirement obligations | 331,731 |  | 83,380
| 524,001 |  | 281,766

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

X
- Definition Schedule disclosing information related to the summary of transactions with subsidiaries joint ventures associates exclusive funds and other related parties by company assets and liabilities . + References No definition available. + Details
Name: | sid_SummaryOfProvisionForEnvironmentalLiabilitiesAndAssetRetirementObligationTableTextBlock
Namespace Prefix: | sid_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration