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6. Inventories (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
SummaryOfInventoriesLineItems [Line Items]    
Cost R$ 3,528,978 R$ 2,808,478
Provision for losses (37,099) (47,271)
Net balance 3,491,879 2,761,207
Fuels, lubricants, and greases    
SummaryOfInventoriesLineItems [Line Items]    
Cost 1,622,054 1,317,042
Provision for losses (3,074) (2,851)
Net balance 1,618,980 1,314,191
Finished goods    
SummaryOfInventoriesLineItems [Line Items]    
Cost 485,407 425,335
Provision for losses (18,495) (19,801)
Net balance 466,912 405,534
Work in process    
SummaryOfInventoriesLineItems [Line Items]    
Cost 1,637 2,011
Provision for losses 0 0
Net balance 1,637 2,011
Raw materials    
SummaryOfInventoriesLineItems [Line Items]    
Cost 492,029 246,974
Provision for losses (1,835) (1,147)
Net balance 490,194 245,827
Liquified petroleum gas    
SummaryOfInventoriesLineItems [Line Items]    
Cost 102,031 71,466
Provision for losses (5,761) (5,761)
Net balance 96,270 65,705
Consumable materials and other items for resale    
SummaryOfInventoriesLineItems [Line Items]    
Cost 160,024 138,610
Provision for losses (5,380) (7,619)
Net balance 154,644 130,991
Pharmaceutical, hygiene, and beauty products    
SummaryOfInventoriesLineItems [Line Items]    
Cost 415,956 352,187
Provision for losses (2,447) (9,985)
Net balance 413,509 342,202
Advances to suppliers    
SummaryOfInventoriesLineItems [Line Items]    
Cost 222,808 228,871
Provision for losses 0 0
Net balance 222,808 228,871
Properties for resale    
SummaryOfInventoriesLineItems [Line Items]    
Cost 27,032 25,982
Provision for losses (107) (107)
Net balance R$ 26,925 R$ 25,875