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24. Net Revenue from Sale and Services (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Revenue From Sale And Services Details      
Gross revenue from sale R$ 82,134,879 R$ 79,361,004 R$ 77,463,652
Gross revenue from services 728,590 621,823 568,556
Sales taxes (1,936,077) (1,929,288) (2,011,860)
Discounts and sales returns (927,557) (703,305) (360,777)
Deferred revenue 7,587 2,721 (4,297)
Net revenue from sales and services R$ 80,007,422 R$ 77,352,955 R$ 75,655,274