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Note 39 - Update as of March 30, 2022 (Details - Textuals) - Usiminas [member]
R$ / shares in Units, $ / shares in Units, shares in Millions, R$ in Millions, $ in Millions
Mar. 30, 2023
BRL (R$)
Number
R$ / shares
shares
Mar. 30, 2023
USD ($)
Number
$ / shares
shares
Dec. 31, 2022
shares
Ordinary shares [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Number of shares subscribed to (in shares)     36.5
Major purchases of assets [member] | The new SHA [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Majority percentage of control group shares 55.00%    
Major purchases of assets [member] | T/T Group [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Percentage of voting capital increased in control group 9.80%    
Percentage of voting capital in control group 61.30%    
Major purchases of assets [member] | T/T Group [member] | The new SHA [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Number of Board members can be appointed through the shareholders agreement | Number 4 4  
Major purchases of assets [member] | NSSMC [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Percentage of voting capital in control group 31.70%    
Major purchases of assets [member] | Previdencia Usiminas [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Percentage of voting capital in control group 7.10%    
Major purchases of assets [member] | Tenaris [member] | The new SHA [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Number of Board members can be appointed through the shareholders agreement | Number 1 1  
Major purchases of assets [member] | Ordinary shares [member] | T/T Group [member] | The new SHA [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Number of shares to be purchased under agreement 68.7    
Shares subscribed to, price per share (in BRL per share) | (per share) R$ 10 $ 1.9  
Shares subscribed to, value R$ 110 $ 21  
Number of shares subscribed to (in shares) 11.0 11.0  
Number of shares outstanding in control group 68.7    
Thresold number of trading days immediately prior to date of exercising option | Number 40    
Major purchases of assets [member] | Ordinary shares [member] | NSSMC [member] | The new SHA [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Number of shares to be purchased under agreement 153.1    
Shares subscribed to, price per share (in BRL per share) | R$ / shares R$ 10    
Number of shares outstanding in control group 153.1    
Number of trading days to calculate moving average share price | Number 40