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Trade receivables, reseller financing and other receivables - Summary of Movements in the Allowance for Loss Allowance for Expected Credit Losses (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of financial assets [line items]      
Begining balance R$ 468,850 R$ 496,040 R$ 559,633
Additions 146,622 143,562 189,815
Reversal (122,675) (136,198) (183,080)
Write-offs (20,203) (34,554) (70,328)
Ending balance 472,594 468,850 496,040
Trade receivables [member]      
Disclosure of financial assets [line items]      
Begining balance 334,467 322,753 374,355
Additions 114,691 115,090 143,828
Reversal (85,549) (76,762) (130,385)
Write-offs (17,874) (26,614) (65,045)
Ending balance 345,735 334,467 322,753
Reseller Financing - Ipiranga [member]      
Disclosure of financial assets [line items]      
Begining balance 134,383 173,287 185,278
Additions 31,931 28,472 45,987
Reversal (37,126) (59,436) (52,695)
Write-offs (2,329) (7,940) (5,283)
Ending balance R$ 126,859 R$ 134,383 R$ 173,287