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30. Segment Information (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) R$ 2,087,309 R$ 1,690,833 R$ 1,438,935
Asset retirement obligation - fuel tanks (see Note 19) (537) (483) (625)
Capitalized borrowing costs (22,243) (23,980) (25,207)
Total investments in property, plant, and equipment and intangible assets (cash flow) 2,064,529 1,666,370 1,413,103
Depreciation and amortization charges: 1,175,951 1,103,538 1,002,647
Total assets (excluding intersegment account balances): 28,340,322 24,159,670  
Ultragaz      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 244,187 248,627 251,463
Depreciation and amortization charges: 182,833 158,193 143,207
Total assets (excluding intersegment account balances): 2,438,113 2,308,686  
Ipiranga      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 1,077,318 911,927 921,634
Depreciation and amortization charges: 716,831 695,664 612,727
Total assets (excluding intersegment account balances): 15,410,667 11,663,289  
Oxiteno      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 466,967 291,294 136,314
Depreciation and amortization charges: 153,110 149,716 158,261
Total assets (excluding intersegment account balances): 6,562,360 6,354,788  
Ultracargo      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 105,028 81,166 24,463
Depreciation and amortization charges: 47,669 43,356 41,668
Total assets (excluding intersegment account balances): 1,394,087 1,535,815  
Extrafarma      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 171,183 140,454 80,813
Depreciation and amortization charges: 60,856 42,666 23,744
Total assets (excluding intersegment account balances): 1,950,000 1,719,524  
Others      
SummaryOfSegmentInformationLineItems [Line Items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 12 and 13) 22,626 17,365 24,248
Depreciation and amortization charges: 14,652 13,943 R$ 23,040
Total assets (excluding intersegment account balances): R$ 585,095 R$ 577,568