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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of cash flows [abstract]      
Net income for the year R$ 4,292,618 R$ 2,244,511 R$ 5,200,583
Adjustments to reconcile net income to net cash provided by operations:      
Accrued charges on borrowings and financing 1,909,546 1,879,116 1,938,077
Charges on loans and financing granted (32,684) (58,728) (50,239)
Depreciation/ depletion / amortization 2,522,063 1,519,331 1,273,021
Equity in results of affiliated companies (71,755) (125,715) (135,706)
Charges on lease liabilities. 54,236 52,607
Deferred income tax and social contribution (1,426,696) (2,398,400) (576,895)
Provision for tax, social security, labor and civil risks 4,405 (164,223) (34,279)
Monetary variations and exchange differences 2,010,056 853,449 1,002,137
Contractual agreement (131,817)
Proceeds from disposal of fixed and intangible assets 12,998 114,603 38,245
Provision (Reversal) for consumption and services (29,057) (130,339) 55,726
Provision for actuarial liabilities (24,019) (20,194) (20,984)
PIS and COFINS credits (160,609) (2,208,462)
Net gain on sale of a foreign subsidiary (1,164,294)
Provision for environmental liabilities and decommissioning of assets 10,388 17,110 (55,247)
Unrealized loss (gains) on shares - Fair value through profit or loss (1,203,068) 118,780 (1,655,813)
Receivables by indemnity (517,183)
Other provisions (7,651) 104,869 (21,877)
Total Adjustments to reconcile net income to net cash provided by operations 7,504,197 3,714,351 3,583,993
Changes in assets and liabilities      
Trade receivables - third parties (594,731) 49,338 99,223
Trade receivables - related parties 49,412 (77,271) 22,071
Inventories 755,571 (218,242) (800,050)
Receivables from related parties/Dividends 90,306 99,276 113,800
Recoverable taxes 865,984 14,051 238,181
Judicial deposits 50,028 19,312 (7,496)
Trade payables 2,103,283 (354,288) 925,176
Trade payables - Drawee risk (497,451) 1,055,546 65,766
Payroll and related taxes (43,649) 36,271 (1,100)
Taxes in installments - REFIS 1,654,135 280,413 (23,806)
Payables to related parties 12,019 1,956 129,031
Advances from customer (10,011) 2,524,826  
Interest paid (1,922,130) (2,039,112) (2,141,710)
Derivative instrument cash settlement (299,585)    
Others (140,504) (234,548) 5,026
Increase (decrease) in assets and liabilities 2,072,677 1,157,528 (1,375,888)
Net cash provided by operating activities 9,576,874 4,871,879 2,208,105
Investments / acquisition of shares (132,197) (209,832) (218,840)
Purchase of property, plant and equipment (1,683,839) (2,214,456) (1,317,102)
Receipt/(Payment) in derivative transactions (230) (372)
Purchase of intangible assets (1,427) (2,200)
Loans granted to related parties (101,631) (101,913) (101,908)
Loans received from related parties 14,584 23,623
Financial investment, net of redeemed amount 39,428 289,213 (167,773)
Cash received by disposal of Usiminas' shares 39,377
Net cash received from the sale of a foreign subsidiary 1,670,359
Cash used to acquire interest in CBSI (21,345)
Net cash used in investing activities (1,863,655) (2,236,367) (98,459)
New borrowings and financing 8,085,902 10,068,627 2,143,679
Cost of transaction (39,174) (67,362) (92,287)
Repayment of borrowings (6,448,658) (11,775,093) (5,019,978)
Amortization of leases (103,648) (94,727)
Payment of dividends and interests on net equity (309,350) (1,920,309) (502,002)
Treasury shares     213,402
Net cash provided by (used in) financing activities 1,185,072 (3,788,864) (3,257,186)
Exchange rate changes on cash and cash equivalents of foreign subsidiaries (42,660) (5,697) (16,028)
Increase (decrease) in cash and cash equivalents 8,855,631 (1,159,049) (1,163,568)
Cash and cash equivalents at the beginning of the year 1,088,955 2,248,004 3,411,572
Cash and cash equivalents at the end of the year R$ 9,944,586 R$ 1,088,955 R$ 2,248,004