| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 20-F | 20-F | 20-F | S-1/A | S-1/A | S-1/A |
| Net income for the year | | | | | | |
| Adjustments to reconcile net income to net cash provided by operations: | | | | | | |
| Accrued charges on borrowings and financing | | | | | | |
| Charges on loans and financing granted | | | | | | |
| Depreciation/ depletion / amortization | | | | | | |
| Equity in results of affiliated companies | | | | | | |
| Charges on lease liabilities | | | | | | |
| Deferred income tax and social contribution | | | | | | |
| Provision for tax, social security, labor and civil risks | | | | | | |
| Monetary variations and exchange differences | | | | | | |
| Contractual agreement | | | | | | |
| Proceeds from disposal of fixed and intangible assets | | | | | | |
| Provision (Reversal) for consumption and services | | | | | | |
| PIS and COFINS credits | | | | | | |
| Provision for environmental liabilities and decommissioning of assets | | | | | | |
| Updated shares – Fair value through profit or loss (VJR) | | | | | | |
| Receivables by indemnity | | | | | | |
| Net gains on the sale of the shares of Usiminas | | | | | | |
| Net gains on the sale of the shares of CSN Mineração | | | | | | |
| Dividends USIMINAS | | | | | | |
| Other provisions | | | | | | |
| Total Adjustments to reconcile net income (loss) to net cash from operations | | | | | | |
| Changes in assets and liabilities | | | | | | |
| Trade receivables - third parties | | | | | | |
| Trade receivables - related parties | | | | | | |
| Inventories | | | | | | |
| Receivables from related parties/Dividends | | | | | | |
| Recoverable taxes | | | | | | |
| Judicial deposits | | | | | | |
| Trade payables | | | | | | |
| Trade payables – Forfaiting and Drawee risk | | | | | | |
| Payroll and related taxes | | | | | | |
| Taxes in installments | | | | | | |
| Payables to related parties | | | | | | |
| Advance from customer | | | | | | |
| Interest paid | | | | | | |
| Cash flow hedge accounting paid | | | | | | |
| Other | | | | | | |
| Increase (Decrease) in assets and liabilities | | | | | | |
| Net cash generated by operating activities | | | | | | |
| Investments / acquisition of shares | | | | | | |
| Purchase of property, plant and equipment | | | | | | |
| Loans granted to related parties | | | | | | |
| Loans received from related parties | | | | | | |
| Financial investment, net of redeemed amount | | | | | | |
| Cash used to acquire interest in CBSI | | | | | | |
| Net cash received from sale of CSN Mineração's shares | | | | | | |
| Cash on Elizabeth´s consolidation | | | | | | |
| Deposit in guarantee for the acquisition of LafargeHolcim | | | | | | |
| Price paid in investments of Elizabeth´s | | | | | | |
| Net cash used in (generated by) investing activities | | | | | | |
| Borrowings and financing raised | | | | | | |
| Cost of borrowing | | | | | | |
| Payment of borrowings | | | | | | |
| Amortization of leases | | | | | | |
| Payment of dividends and interests on shareholder’s equity | | | | | | |
| Issuance of new CSN Mineração's shares | | | | | | |
| Share repurchase | -1,516 | | | | | |
| Net cash used in (generated by) financing activities | | | | | | |
| Exchange rate changes on cash and cash equivalents of foreign subsidiaries | | | | | | |
| Increase (Decrease) in cash and cash equivalents | | | | | | |