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Expenses by nature - Expenses by nature (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses by nature details [abstract]      
Raw materials and materials for use and consumption R$ 73,933,944 R$ 81,819,820 R$ 83,116,950
Personnel expenses 2,275,115 2,415,581 2,513,586
Freight and storage 1,424,753 1,170,870 1,178,990
Depreciation and amortization 938,841 844,647 812,489
Amortization of right to use assets 328,322 300,058  
Advertising and marketing 153,057 206,103 173,988
Services provided by third parties 357,195 322,589 328,361
Other expenses 301,417 444,078 709,710
Total 79,712,644 87,523,746 88,834,074
Cost of products and services sold 75,628,214 83,187,109 84,537,368
Selling and marketing 2,547,850 2,610,384 2,601,617
General and administrative 1,536,580 1,726,253 1,625,839
Total R$ 79,712,644 R$ 87,523,746 R$ 88,834,074