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10. Accounts Receivable Concessions (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivable Concessions Details 1Abstract    
Distribution concession agreement, beginning R$ 684,206 R$ 614,806
Transfers from contract assets 66,380  
Donations and grants received   76
Transfers from intangible assets   56,853
Transfers to other receivables (assets held for disposal) (1,334) (3,711)
Fair value recognition 35,306 16,199
Loss on disposal (1,535) (17)
Distribution concession agreement, ending R$ 783,023 R$ 684,206