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EMPLOYEE BENEFITS (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Cost of service R$ 1,509 R$ 1,152 R$ 1,629
Interest cost 298,872 347,297 324,955
Defined benefit plans other than multi-employer plans, state plans and plans that share risks between entities under common control [member]      
IfrsStatementLineItems [Line Items]      
Present value of obligations at the beginning of the year 3,329,075 3,117,307 3,151,609
Consolidation of CSN Cimentos Brazil     78,066
Cost of service 1,509 1,152 1,629
Interest cost 298,872 347,297 324,955
Participant contributions made in the year 1,348 1,404 1,382
Benefits paid (334,094) (324,750) (312,301)
Actuarial loss/(gain) (392,687) 186,665 (128,033)
Present value of obligations at the end of the year R$ 2,904,023 R$ 3,329,075 R$ 3,117,307