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25. Expenses by Nature (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses By Nature Details      
Raw materials and materials for use and consumption R$ 71,521,652 R$ 69,173,511 R$ 67,763,793
Personnel expenses 2,231,556 2,042,985 1,950,776
Freight and storage 1,117,467 1,077,552 1,134,388
Depreciation and amortization 1,175,951 1,103,538 1,002,647
Advertising and marketing 192,441 200,011 177,336
Services provided by third parties 351,227 318,746 255,750
Lease of real estate and equipment 196,970 164,740 143,677
Other expenses 410,356 359,000 343,237
Total expenses by nature 77,197,620 74,440,083 72,771,604
Cost of products and services sold 72,735,781 70,342,723 68,933,702
Selling and marketing 2,885,311 2,651,501 2,516,561
General and administrative 1,576,528 1,445,859 1,321,341
Expenses by nature R$ 77,197,620 R$ 74,440,083 R$ 72,771,604